Merge branch 'main' into completion-matcher

.github/workflows/docs.yml

@@ -1,36 +1,36 b''
 name: Build docs
 
 on: [push, pull_request]
 
 jobs:
   build:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
-    - name: Set up Python 3.8
-      uses: actions/setup-python@v2
+    - uses: actions/checkout@v3
+    - name: Set up Python
+      uses: actions/setup-python@v4
       with:
-        python-version: 3.8
+        python-version: 3.x
     - name: Install Graphviz
       run: |
         sudo apt-get update
         sudo apt-get install graphviz
     - name: Install Python dependencies
       run: |
         python -m pip install --upgrade pip setuptools coverage rstvalidator
         pip install -r docs/requirements.txt
     - name: Build docs
       run: |
         python -m rstvalidator long_description.rst
         python tools/fixup_whats_new_pr.py
         make -C docs/ html SPHINXOPTS="-W" \
           PYTHON="coverage run -a" \
           SPHINXBUILD="coverage run -a -m sphinx.cmd.build"
     - name: Generate coverage xml
       run: |
         coverage combine `find . -name .coverage\*` && coverage xml
     - name: Upload coverage to Codecov
       uses: codecov/codecov-action@v2
       with:
         name: Docs

.github/workflows/downstream.yml

@@ -1,50 +1,50 b''
 name: Run Downstream tests
 
 on:
   push:
   pull_request:
   # Run weekly on Monday at 1:23 UTC
   schedule:
   - cron:  '23 1 * * 1'
   workflow_dispatch:
 
 
 jobs:
   test:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
         os: [ubuntu-latest]
         python-version: ["3.9"]
         include:
           - os: macos-latest
             python-version: "3.9"
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v4
       with:
         python-version: ${{ matrix.python-version }}
     - name: Update Python installer
       run: |
         python -m pip install --upgrade pip setuptools wheel
     - name: Install ipykernel
       run: |
         cd .. 
         git clone https://github.com/ipython/ipykernel
         cd ipykernel
         pip install -e .[test] 
         cd ..
     - name: Install and update Python dependencies
       run: |
         python -m pip install --upgrade -e file://$PWD#egg=ipython[test]
         # we must install IPython after ipykernel to get the right versions.
         python -m pip install --upgrade --upgrade-strategy eager flaky ipyparallel
         python -m pip install --upgrade 'pytest<7' 
     - name: pytest
       env:
         COLUMNS: 120
       run: |
         cd ../ipykernel
         pytest

.github/workflows/mypy.yml

@@ -1,34 +1,34 b''
 name: Run MyPy
 
 on:
   push:
     branches: [ main, 7.x]
   pull_request:
     branches: [ main, 7.x]
 
 jobs:
   build:
 
     runs-on: ubuntu-latest
     strategy:
       matrix:
         python-version: [3.8]
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v4
       with:
         python-version: ${{ matrix.python-version }}
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
         pip install mypy pyflakes flake8
     - name: Lint with mypy
       run: |
         mypy -p IPython.terminal
         mypy -p IPython.core.magics
     - name: Lint with pyflakes
       run: |
         flake8  IPython/core/magics/script.py
         flake8  IPython/core/magics/packaging.py

.github/workflows/python-package.yml

@@ -1,40 +1,36 b''
 # This workflow will install Python dependencies, run tests and lint with a variety of Python versions
 # For more information see: https://help.github.com/actions/language-and-framework-guides/using-python-with-github-actions
 
 name: Python package
 
 on:
   push:
     branches: [ main, 7.x ]
   pull_request:
     branches: [ main, 7.x ]
 
 jobs:
   formatting:
 
     runs-on: ubuntu-latest
     timeout-minutes: 5
-    strategy:
-      matrix:
-        python-version: [3.8]
-
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
       with:
         fetch-depth: 0
-    - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v2
+    - name: Set up Python
+      uses: actions/setup-python@v4
       with:
-        python-version: ${{ matrix.python-version }}
+        python-version: 3.x
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
         pip install darker black==21.12b0
     - name: Lint with darker
       run: |
         darker -r 60625f241f298b5039cb2debc365db38aa7bb522 --check --diff . || (
         echo "Changes need auto-formatting. Run:"
         echo "    darker -r 60625f241f298b5039cb2debc365db38aa7bb522"
         echo "then commit and push changes to fix."
         exit 1
         )

.github/workflows/test.yml

@@ -1,80 +1,80 b''
 name: Run tests
 
 on:
   push:
     branches:
       - main
       - '*.x'
   pull_request:
   # Run weekly on Monday at 1:23 UTC
   schedule:
   - cron:  '23 1 * * 1'
   workflow_dispatch:
 
 
 jobs:
   test:
     runs-on: ${{ matrix.os }}
     strategy:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, windows-latest]
         python-version: ["3.8", "3.9", "3.10"]
         deps: [test_extra]
         # Test all on ubuntu, test ends on macos
         include:
           - os: macos-latest
             python-version: "3.8"
             deps: test_extra
           - os: macos-latest
             python-version: "3.10"
             deps: test_extra
           # Tests minimal dependencies set
           - os: ubuntu-latest
             python-version: "3.10"
             deps: test
           # Tests latest development Python version
           - os: ubuntu-latest
             python-version: "3.11-dev"
             deps: test
           # Installing optional dependencies stuff takes ages on PyPy
           - os: ubuntu-latest
             python-version: "pypy-3.8"
             deps: test
           - os: windows-latest
             python-version: "pypy-3.8"
             deps: test
           - os: macos-latest
             python-version: "pypy-3.8"
             deps: test
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v4
       with:
         python-version: ${{ matrix.python-version }}
         cache: pip
     - name: Install latex
       if: runner.os == 'Linux' && matrix.deps == 'test_extra'
       run: echo "disable latex for now, issues in mirros" #sudo apt-get -yq -o Acquire::Retries=3 --no-install-suggests --no-install-recommends install texlive dvipng
     - name: Install and update Python dependencies
       run: |
         python -m pip install --upgrade pip setuptools wheel build
         python -m pip install --upgrade -e .[${{ matrix.deps }}]
         python -m pip install --upgrade check-manifest pytest-cov
     - name: Try building with Python build
       if: runner.os != 'Windows'  # setup.py does not support sdist on Windows
       run: |
         python -m build
         shasum -a 256 dist/*
     - name: Check manifest
       if: runner.os != 'Windows'  # setup.py does not support sdist on Windows
       run: check-manifest
     - name: pytest
       env:
         COLUMNS: 120
       run: |
         pytest --color=yes -raXxs ${{ startsWith(matrix.python-version, 'pypy') && ' ' || '--cov --cov-report=xml' }}
     - name: Upload coverage to Codecov
       uses: codecov/codecov-action@v2

IPython/core/completer.py

@@ -1,2858 +1,2862 b''
 """Completion for IPython.
 
 This module started as fork of the rlcompleter module in the Python standard
 library.  The original enhancements made to rlcompleter have been sent
 upstream and were accepted as of Python 2.3,
 
 This module now support a wide variety of completion mechanism both available
 for normal classic Python code, as well as completer for IPython specific
 Syntax like magics.
 
 Latex and Unicode completion
 ============================
 
 IPython and compatible frontends not only can complete your code, but can help
 you to input a wide range of characters. In particular we allow you to insert
 a unicode character using the tab completion mechanism.
 
 Forward latex/unicode completion
 --------------------------------
 
 Forward completion allows you to easily type a unicode character using its latex
 name, or unicode long description. To do so type a backslash follow by the
 relevant name and press tab:
 
 
 Using latex completion:
 
 .. code::
 
     \\alpha<tab>
     α
 
 or using unicode completion:
 
 
 .. code::
 
     \\GREEK SMALL LETTER ALPHA<tab>
     α
 
 
 Only valid Python identifiers will complete. Combining characters (like arrow or
 dots) are also available, unlike latex they need to be put after the their
 counterpart that is to say, ``F\\\\vec<tab>`` is correct, not ``\\\\vec<tab>F``.
 
 Some browsers are known to display combining characters incorrectly.
 
 Backward latex completion
 -------------------------
 
 It is sometime challenging to know how to type a character, if you are using
 IPython, or any compatible frontend you can prepend backslash to the character
 and press ``<tab>`` to expand it to its latex form.
 
 .. code::
 
     \\α<tab>
     \\alpha
 
 
 Both forward and backward completions can be deactivated by setting the
 ``Completer.backslash_combining_completions`` option to ``False``.
 
 
 Experimental
 ============
 
 Starting with IPython 6.0, this module can make use of the Jedi library to
 generate completions both using static analysis of the code, and dynamically
 inspecting multiple namespaces. Jedi is an autocompletion and static analysis
 for Python. The APIs attached to this new mechanism is unstable and will
 raise unless use in an :any:`provisionalcompleter` context manager.
 
 You will find that the following are experimental:
 
     - :any:`provisionalcompleter`
     - :any:`IPCompleter.completions`
     - :any:`Completion`
     - :any:`rectify_completions`
 
 .. note::
 
     better name for :any:`rectify_completions` ?
 
 We welcome any feedback on these new API, and we also encourage you to try this
 module in debug mode (start IPython with ``--Completer.debug=True``) in order
 to have extra logging information if :any:`jedi` is crashing, or if current
 IPython completer pending deprecations are returning results not yet handled
 by :any:`jedi`
 
 Using Jedi for tab completion allow snippets like the following to work without
 having to execute any code:
 
    >>> myvar = ['hello', 42]
    ... myvar[1].bi<tab>
 
 Tab completion will be able to infer that ``myvar[1]`` is a real number without
 executing any code unlike the previously available ``IPCompleter.greedy``
 option.
 
 Be sure to update :any:`jedi` to the latest stable version or to try the
 current development version to get better completions.
 
 Matchers
 ========
 
 All completions routines are implemented using unified *Matchers* API.
 The matchers API is provisional and subject to change without notice.
 
 The built-in matchers include:
 
 - ``IPCompleter.dict_key_matcher``:  dictionary key completions,
 - ``IPCompleter.magic_matcher``: completions for magics,
 - ``IPCompleter.unicode_name_matcher``, ``IPCompleter.fwd_unicode_matcher`` and ``IPCompleter.latex_matcher``: see `Forward latex/unicode completion`_,
 - ``back_unicode_name_matcher`` and ``back_latex_name_matcher``: see `Backward latex completion`_,
 - ``IPCompleter.file_matcher``: paths to files and directories,
 - ``IPCompleter.python_func_kw_matcher`` - function keywords,
 - ``IPCompleter.python_matches`` - globals and attributes (v1 API),
 - ``IPCompleter.jedi_matcher`` - static analysis with Jedi,
 - ``IPCompleter.custom_completer_matcher`` - pluggable completer with a default implementation in any:`core.InteractiveShell`
   which uses uses IPython hooks system (`complete_command`) with string dispatch (including regular expressions).
   Differently to other matchers, ``custom_completer_matcher`` will not suppress Jedi results to match
   behaviour in earlier IPython versions.
 
 Custom matchers can be added by appending to ``IPCompleter.custom_matchers`` list.
 
 Suppression of competing matchers
 ---------------------------------
 
 By default results from all matchers are combined, in the order determined by
 their priority. Matchers can request to suppress results from subsequent
 matchers by setting ``suppress`` to ``True`` in the ``MatcherResult``.
 
 When multiple matchers simultaneously request surpression, the results from of
 the matcher with higher priority will be returned.
 
 Sometimes it is desirable to suppress most but not all other matchers;
 this can be achieved by adding a list of identifiers of matchers which
 should not be suppressed to ``MatcherResult`` under ``do_not_suppress`` key.
 """
 
 
 # Copyright (c) IPython Development Team.
 # Distributed under the terms of the Modified BSD License.
 #
 # Some of this code originated from rlcompleter in the Python standard library
 # Copyright (C) 2001 Python Software Foundation, www.python.org
 
 
 import builtins as builtin_mod
 import glob
 import inspect
 import itertools
 import keyword
 import os
 import re
 import string
 import sys
 import time
 import unicodedata
 import uuid
 import warnings
 from contextlib import contextmanager
 from functools import lru_cache, partial
 from importlib import import_module
 from types import SimpleNamespace
 from typing import (
     Iterable,
     Iterator,
     List,
     Tuple,
     Union,
     Any,
     Sequence,
     Dict,
     NamedTuple,
     Pattern,
     Optional,
     Callable,
     TYPE_CHECKING,
     Set,
 )
 
 from IPython.core.error import TryNext
 from IPython.core.inputtransformer2 import ESC_MAGIC
 from IPython.core.latex_symbols import latex_symbols, reverse_latex_symbol
 from IPython.core.oinspect import InspectColors
 from IPython.testing.skipdoctest import skip_doctest
 from IPython.utils import generics
 from IPython.utils.dir2 import dir2, get_real_method
 from IPython.utils.path import ensure_dir_exists
 from IPython.utils.process import arg_split
 from traitlets import (
     Bool,
     Enum,
     Int,
     List as ListTrait,
     Unicode,
     Dict as DictTrait,
     Union as UnionTrait,
     default,
     observe,
 )
 from traitlets.config.configurable import Configurable
 
 import __main__
 
 # skip module docstests
 __skip_doctest__ = True
 
 
 try:
     import jedi
     jedi.settings.case_insensitive_completion = False
     import jedi.api.helpers
     import jedi.api.classes
     JEDI_INSTALLED = True
 except ImportError:
     JEDI_INSTALLED = False
 
 if TYPE_CHECKING:
     from typing import cast
     from typing_extensions import TypedDict, NotRequired
 else:
 
     def cast(obj, _type):
         return obj
 
     TypedDict = Dict
     NotRequired = Tuple
 
 # -----------------------------------------------------------------------------
 # Globals
 #-----------------------------------------------------------------------------
 
 # ranges where we have most of the valid unicode names. We could be more finer
 # grained but is it worth it for performance  While unicode have character in the
 # range 0, 0x110000, we seem to have name for about 10% of those. (131808 as I
 # write this). With below range we cover them all, with a density of ~67%
 # biggest next gap we consider only adds up about 1% density and there are 600
 # gaps that would need hard coding.
 _UNICODE_RANGES = [(32, 0x3134b), (0xe0001, 0xe01f0)]
 
 # Public API
 __all__ = ["Completer", "IPCompleter"]
 
 if sys.platform == 'win32':
     PROTECTABLES = ' '
 else:
     PROTECTABLES = ' ()[]{}?=\\|;:\'#*"^&'
 
 # Protect against returning an enormous number of completions which the frontend
 # may have trouble processing.
 MATCHES_LIMIT = 500
 
 # Completion type reported when no type can be inferred.
 _UNKNOWN_TYPE = "<unknown>"
 
 class ProvisionalCompleterWarning(FutureWarning):
     """
     Exception raise by an experimental feature in this module.
 
     Wrap code in :any:`provisionalcompleter` context manager if you
     are certain you want to use an unstable feature.
     """
     pass
 
 warnings.filterwarnings('error', category=ProvisionalCompleterWarning)
 
 
 @skip_doctest
 @contextmanager
 def provisionalcompleter(action='ignore'):
     """
     This context manager has to be used in any place where unstable completer
     behavior and API may be called.
 
     >>> with provisionalcompleter():
     ...     completer.do_experimental_things() # works
 
     >>> completer.do_experimental_things() # raises.
 
     .. note::
 
         Unstable
 
         By using this context manager you agree that the API in use may change
         without warning, and that you won't complain if they do so.
 
         You also understand that, if the API is not to your liking, you should report
         a bug to explain your use case upstream.
 
         We'll be happy to get your feedback, feature requests, and improvements on
         any of the unstable APIs!
     """
     with warnings.catch_warnings():
         warnings.filterwarnings(action, category=ProvisionalCompleterWarning)
         yield
 
 
 def has_open_quotes(s):
     """Return whether a string has open quotes.
 
     This simply counts whether the number of quote characters of either type in
     the string is odd.
 
     Returns
     -------
     If there is an open quote, the quote character is returned.  Else, return
     False.
     """
     # We check " first, then ', so complex cases with nested quotes will get
     # the " to take precedence.
     if s.count('"') % 2:
         return '"'
     elif s.count("'") % 2:
         return "'"
     else:
         return False
 
 
 def protect_filename(s, protectables=PROTECTABLES):
     """Escape a string to protect certain characters."""
     if set(s) & set(protectables):
         if sys.platform == "win32":
             return '"' + s + '"'
         else:
             return "".join(("\\" + c if c in protectables else c) for c in s)
     else:
         return s
 
 
 def expand_user(path:str) -> Tuple[str, bool, str]:
     """Expand ``~``-style usernames in strings.
 
     This is similar to :func:`os.path.expanduser`, but it computes and returns
     extra information that will be useful if the input was being used in
     computing completions, and you wish to return the completions with the
     original '~' instead of its expanded value.
 
     Parameters
     ----------
     path : str
         String to be expanded.  If no ~ is present, the output is the same as the
         input.
 
     Returns
     -------
     newpath : str
         Result of ~ expansion in the input path.
     tilde_expand : bool
         Whether any expansion was performed or not.
     tilde_val : str
         The value that ~ was replaced with.
     """
     # Default values
     tilde_expand = False
     tilde_val = ''
     newpath = path
 
     if path.startswith('~'):
         tilde_expand = True
         rest = len(path)-1
         newpath = os.path.expanduser(path)
         if rest:
             tilde_val = newpath[:-rest]
         else:
             tilde_val = newpath
 
     return newpath, tilde_expand, tilde_val
 
 
 def compress_user(path:str, tilde_expand:bool, tilde_val:str) -> str:
     """Does the opposite of expand_user, with its outputs.
     """
     if tilde_expand:
         return path.replace(tilde_val, '~')
     else:
         return path
 
 
 def completions_sorting_key(word):
     """key for sorting completions
 
     This does several things:
 
     - Demote any completions starting with underscores to the end
     - Insert any %magic and %%cellmagic completions in the alphabetical order
       by their name
     """
     prio1, prio2 = 0, 0
 
     if word.startswith('__'):
         prio1 = 2
     elif word.startswith('_'):
         prio1 = 1
 
     if word.endswith('='):
         prio1 = -1
 
     if word.startswith('%%'):
         # If there's another % in there, this is something else, so leave it alone
         if not "%" in word[2:]:
             word = word[2:]
             prio2 = 2
     elif word.startswith('%'):
         if not "%" in word[1:]:
             word = word[1:]
             prio2 = 1
 
     return prio1, word, prio2
 
 
 class _FakeJediCompletion:
     """
     This is a workaround to communicate to the UI that Jedi has crashed and to
     report a bug. Will be used only id :any:`IPCompleter.debug` is set to true.
 
     Added in IPython 6.0 so should likely be removed for 7.0
 
     """
 
     def __init__(self, name):
 
         self.name = name
         self.complete = name
         self.type = 'crashed'
         self.name_with_symbols = name
         self.signature = ''
         self._origin = 'fake'
 
     def __repr__(self):
         return '<Fake completion object jedi has crashed>'
 
 
 _JediCompletionLike = Union[jedi.api.Completion, _FakeJediCompletion]
 
 
 class Completion:
     """
     Completion object used and returned by IPython completers.
 
     .. warning::
 
         Unstable
 
         This function is unstable, API may change without warning.
         It will also raise unless use in proper context manager.
 
     This act as a middle ground :any:`Completion` object between the
     :any:`jedi.api.classes.Completion` object and the Prompt Toolkit completion
     object. While Jedi need a lot of information about evaluator and how the
     code should be ran/inspected, PromptToolkit (and other frontend) mostly
     need user facing information.
 
     - Which range should be replaced replaced by what.
     - Some metadata (like completion type), or meta information to displayed to
       the use user.
 
     For debugging purpose we can also store the origin of the completion (``jedi``,
     ``IPython.python_matches``, ``IPython.magics_matches``...).
     """
 
     __slots__ = ['start', 'end', 'text', 'type', 'signature', '_origin']
 
     def __init__(self, start: int, end: int, text: str, *, type: str=None, _origin='', signature='') -> None:
         warnings.warn("``Completion`` is a provisional API (as of IPython 6.0). "
                       "It may change without warnings. "
                       "Use in corresponding context manager.",
                       category=ProvisionalCompleterWarning, stacklevel=2)
 
         self.start = start
         self.end = end
         self.text = text
         self.type = type
         self.signature = signature
         self._origin = _origin
 
     def __repr__(self):
         return '<Completion start=%s end=%s text=%r type=%r, signature=%r,>' % \
                 (self.start, self.end, self.text, self.type or '?', self.signature or '?')
 
     def __eq__(self, other)->Bool:
         """
         Equality and hash do not hash the type (as some completer may not be
         able to infer the type), but are use to (partially) de-duplicate
         completion.
 
         Completely de-duplicating completion is a bit tricker that just
         comparing as it depends on surrounding text, which Completions are not
         aware of.
         """
         return self.start == other.start and \
             self.end == other.end and \
             self.text == other.text
 
     def __hash__(self):
         return hash((self.start, self.end, self.text))
 
 
 class SimpleCompletion:
     """Completion item to be included in the dictionary returned by new-style Matcher (API v2).
 
     .. warning::
 
         Provisional
 
         This class is used to describe the currently supported attributes of
         simple completion items, and any additional implementation details
         should not be relied on. Additional attributes may be included in
         future versions, and meaning of text disambiguated from the current
         dual meaning of "text to insert" and "text to used as a label".
     """
 
     __slots__ = ["text", "type"]
 
     def __init__(self, text: str, *, type: str = None):
         self.text = text
         self.type = type
 
     def __repr__(self):
         return f"<SimpleCompletion text={self.text!r} type={self.type!r}>"
 
 
 class MatcherResultBase(TypedDict):
     """Definition of dictionary to be returned by new-style Matcher (API v2)."""
 
     #: suffix of the provided ``CompletionContext.token``, if not given defaults to full token.
     matched_fragment: NotRequired[str]
 
     #: whether to suppress results from all other matchers (True), some
     #: matchers (set of identifiers) or none (False); default is False.
     suppress: NotRequired[Union[bool, Set[str]]]
 
     #: identifiers of matchers which should NOT be suppressed
     do_not_suppress: NotRequired[Set[str]]
 
     #: are completions already ordered and should be left as-is? default is False.
     ordered: NotRequired[bool]
 
 
 class SimpleMatcherResult(MatcherResultBase):
     """Result of new-style completion matcher."""
 
     #: list of candidate completions
     completions: Sequence[SimpleCompletion]
 
 
 class _JediMatcherResult(MatcherResultBase):
     """Matching result returned by Jedi (will be processed differently)"""
 
     #: list of candidate completions
     completions: Iterable[_JediCompletionLike]
 
 
 class CompletionContext(NamedTuple):
     """Completion context provided as an argument to matchers in the Matcher API v2."""
 
     # rationale: many legacy matchers relied on completer state (`self.text_until_cursor`)
     # which was not explicitly visible as an argument of the matcher, making any refactor
     # prone to errors; by explicitly passing `cursor_position` we can decouple the matchers
     # from the completer, and make substituting them in sub-classes easier.
 
     #: Relevant fragment of code directly preceding the cursor.
     #: The extraction of token is implemented via splitter heuristic
     #: (following readline behaviour for legacy reasons), which is user configurable
     #: (by switching the greedy mode).
     token: str
 
     #: The full available content of the editor or buffer
     full_text: str
 
     #: Cursor position in the line (the same for ``full_text`` and ``text``).
     cursor_position: int
 
     #: Cursor line in ``full_text``.
     cursor_line: int
 
     #: The maximum number of completions that will be used downstream.
     #: Matchers can use this information to abort early.
     #: The built-in Jedi matcher is currently excepted from this limit.
     limit: int
 
     @property
     @lru_cache(maxsize=None)  # TODO change to @cache after dropping Python 3.7
     def text_until_cursor(self) -> str:
         return self.line_with_cursor[: self.cursor_position]
 
     @property
     @lru_cache(maxsize=None)  # TODO change to @cache after dropping Python 3.7
     def line_with_cursor(self) -> str:
         return self.full_text.split("\n")[self.cursor_line]
 
 
 MatcherResult = Union[SimpleMatcherResult, _JediMatcherResult]
 
 MatcherAPIv1 = Callable[[str], List[str]]
 MatcherAPIv2 = Callable[[CompletionContext], MatcherResult]
 Matcher = Union[MatcherAPIv1, MatcherAPIv2]
 
 
 def completion_matcher(
     *, priority: float = None, identifier: str = None, api_version: int = 1
 ):
     """Adds attributes describing the matcher.
 
     Parameters
     ----------
     priority : Optional[float]
         The priority of the matcher, determines the order of execution of matchers.
         Higher priority means that the matcher will be executed first. Defaults to 0.
     identifier : Optional[str]
         identifier of the matcher allowing users to modify the behaviour via traitlets,
         and also used to for debugging (will be passed as ``origin`` with the completions).
         Defaults to matcher function ``__qualname__``.
     api_version: Optional[int]
         version of the Matcher API used by this matcher.
         Currently supported values are 1 and 2.
         Defaults to 1.
     """
 
     def wrapper(func: Matcher):
         func.matcher_priority = priority or 0
         func.matcher_identifier = identifier or func.__qualname__
         func.matcher_api_version = api_version
         if TYPE_CHECKING:
             if api_version == 1:
                 func = cast(func, MatcherAPIv1)
             elif api_version == 2:
                 func = cast(func, MatcherAPIv2)
         return func
 
     return wrapper
 
 
 def _get_matcher_priority(matcher: Matcher):
     return getattr(matcher, "matcher_priority", 0)
 
 
 def _get_matcher_id(matcher: Matcher):
     return getattr(matcher, "matcher_identifier", matcher.__qualname__)
 
 
 def _get_matcher_api_version(matcher):
     return getattr(matcher, "matcher_api_version", 1)
 
 
 context_matcher = partial(completion_matcher, api_version=2)
 
 
 _IC = Iterable[Completion]
 
 
 def _deduplicate_completions(text: str, completions: _IC)-> _IC:
     """
     Deduplicate a set of completions.
 
     .. warning::
 
         Unstable
 
         This function is unstable, API may change without warning.
 
     Parameters
     ----------
     text : str
         text that should be completed.
     completions : Iterator[Completion]
         iterator over the completions to deduplicate
 
     Yields
     ------
     `Completions` objects
     Completions coming from multiple sources, may be different but end up having
     the same effect when applied to ``text``. If this is the case, this will
     consider completions as equal and only emit the first encountered.
     Not folded in `completions()` yet for debugging purpose, and to detect when
     the IPython completer does return things that Jedi does not, but should be
     at some point.
     """
     completions = list(completions)
     if not completions:
         return
 
     new_start = min(c.start for c in completions)
     new_end = max(c.end for c in completions)
 
     seen = set()
     for c in completions:
         new_text = text[new_start:c.start] + c.text + text[c.end:new_end]
         if new_text not in seen:
             yield c
             seen.add(new_text)
 
 
 def rectify_completions(text: str, completions: _IC, *, _debug: bool = False) -> _IC:
     """
     Rectify a set of completions to all have the same ``start`` and ``end``
 
     .. warning::
 
         Unstable
 
         This function is unstable, API may change without warning.
         It will also raise unless use in proper context manager.
 
     Parameters
     ----------
     text : str
         text that should be completed.
     completions : Iterator[Completion]
         iterator over the completions to rectify
     _debug : bool
         Log failed completion
 
     Notes
     -----
     :any:`jedi.api.classes.Completion` s returned by Jedi may not have the same start and end, though
     the Jupyter Protocol requires them to behave like so. This will readjust
     the completion to have the same ``start`` and ``end`` by padding both
     extremities with surrounding text.
 
     During stabilisation should support a ``_debug`` option to log which
     completion are return by the IPython completer and not found in Jedi in
     order to make upstream bug report.
     """
     warnings.warn("`rectify_completions` is a provisional API (as of IPython 6.0). "
                  "It may change without warnings. "
                  "Use in corresponding context manager.",
                   category=ProvisionalCompleterWarning, stacklevel=2)
 
     completions = list(completions)
     if not completions:
         return
     starts = (c.start for c in completions)
     ends = (c.end for c in completions)
 
     new_start = min(starts)
     new_end = max(ends)
 
     seen_jedi = set()
     seen_python_matches = set()
     for c in completions:
         new_text = text[new_start:c.start] + c.text + text[c.end:new_end]
         if c._origin == 'jedi':
             seen_jedi.add(new_text)
         elif c._origin == 'IPCompleter.python_matches':
             seen_python_matches.add(new_text)
         yield Completion(new_start, new_end, new_text, type=c.type, _origin=c._origin, signature=c.signature)
     diff = seen_python_matches.difference(seen_jedi)
     if diff and _debug:
         print('IPython.python matches have extras:', diff)
 
 
 if sys.platform == 'win32':
     DELIMS = ' \t\n`!@#$^&*()=+[{]}|;\'",<>?'
 else:
     DELIMS = ' \t\n`!@#$^&*()=+[{]}\\|;:\'",<>?'
 
 GREEDY_DELIMS = ' =\r\n'
 
 
 class CompletionSplitter(object):
     """An object to split an input line in a manner similar to readline.
 
     By having our own implementation, we can expose readline-like completion in
     a uniform manner to all frontends.  This object only needs to be given the
     line of text to be split and the cursor position on said line, and it
     returns the 'word' to be completed on at the cursor after splitting the
     entire line.
 
     What characters are used as splitting delimiters can be controlled by
     setting the ``delims`` attribute (this is a property that internally
     automatically builds the necessary regular expression)"""
 
     # Private interface
 
     # A string of delimiter characters.  The default value makes sense for
     # IPython's most typical usage patterns.
     _delims = DELIMS
 
     # The expression (a normal string) to be compiled into a regular expression
     # for actual splitting.  We store it as an attribute mostly for ease of
     # debugging, since this type of code can be so tricky to debug.
     _delim_expr = None
 
     # The regular expression that does the actual splitting
     _delim_re = None
 
     def __init__(self, delims=None):
         delims = CompletionSplitter._delims if delims is None else delims
         self.delims = delims
 
     @property
     def delims(self):
         """Return the string of delimiter characters."""
         return self._delims
 
     @delims.setter
     def delims(self, delims):
         """Set the delimiters for line splitting."""
         expr = '[' + ''.join('\\'+ c for c in delims) + ']'
         self._delim_re = re.compile(expr)
         self._delims = delims
         self._delim_expr = expr
 
     def split_line(self, line, cursor_pos=None):
         """Split a line of text with a cursor at the given position.
         """
         l = line if cursor_pos is None else line[:cursor_pos]
         return self._delim_re.split(l)[-1]
 
 
 
 class Completer(Configurable):
 
     greedy = Bool(False,
         help="""Activate greedy completion
         PENDING DEPRECATION. this is now mostly taken care of with Jedi.
 
         This will enable completion on elements of lists, results of function calls, etc.,
         but can be unsafe because the code is actually evaluated on TAB.
         """,
     ).tag(config=True)
 
     use_jedi = Bool(default_value=JEDI_INSTALLED,
                     help="Experimental: Use Jedi to generate autocompletions. "
                     "Default to True if jedi is installed.").tag(config=True)
 
     jedi_compute_type_timeout = Int(default_value=400,
         help="""Experimental: restrict time (in milliseconds) during which Jedi can compute types.
         Set to 0 to stop computing types. Non-zero value lower than 100ms may hurt
         performance by preventing jedi to build its cache.
         """).tag(config=True)
 
     debug = Bool(default_value=False,
                  help='Enable debug for the Completer. Mostly print extra '
                       'information for experimental jedi integration.')\
                       .tag(config=True)
 
     backslash_combining_completions = Bool(True,
         help="Enable unicode completions, e.g. \\alpha<tab> . "
              "Includes completion of latex commands, unicode names, and expanding "
              "unicode characters back to latex commands.").tag(config=True)
 
     def __init__(self, namespace=None, global_namespace=None, **kwargs):
         """Create a new completer for the command line.
 
         Completer(namespace=ns, global_namespace=ns2) -> completer instance.
 
         If unspecified, the default namespace where completions are performed
         is __main__ (technically, __main__.__dict__). Namespaces should be
         given as dictionaries.
 
         An optional second namespace can be given.  This allows the completer
         to handle cases where both the local and global scopes need to be
         distinguished.
         """
 
         # Don't bind to namespace quite yet, but flag whether the user wants a
         # specific namespace or to use __main__.__dict__. This will allow us
         # to bind to __main__.__dict__ at completion time, not now.
         if namespace is None:
             self.use_main_ns = True
         else:
             self.use_main_ns = False
             self.namespace = namespace
 
         # The global namespace, if given, can be bound directly
         if global_namespace is None:
             self.global_namespace = {}
         else:
             self.global_namespace = global_namespace
 
         self.custom_matchers = []
 
         super(Completer, self).__init__(**kwargs)
 
     def complete(self, text, state):
         """Return the next possible completion for 'text'.
 
         This is called successively with state == 0, 1, 2, ... until it
         returns None.  The completion should begin with 'text'.
 
         """
         if self.use_main_ns:
             self.namespace = __main__.__dict__
 
         if state == 0:
             if "." in text:
                 self.matches = self.attr_matches(text)
             else:
                 self.matches = self.global_matches(text)
         try:
             return self.matches[state]
         except IndexError:
             return None
 
     def global_matches(self, text):
         """Compute matches when text is a simple name.
 
         Return a list of all keywords, built-in functions and names currently
         defined in self.namespace or self.global_namespace that match.
 
         """
         matches = []
         match_append = matches.append
         n = len(text)
-        for lst in [keyword.kwlist,
-                    builtin_mod.__dict__.keys(),
-                    self.namespace.keys(),
-                    self.global_namespace.keys()]:
+        for lst in [
+            keyword.kwlist,
+            builtin_mod.__dict__.keys(),
+            list(self.namespace.keys()),
+            list(self.global_namespace.keys()),
+        ]:
             for word in lst:
                 if word[:n] == text and word != "__builtins__":
                     match_append(word)
 
         snake_case_re = re.compile(r"[^_]+(_[^_]+)+?\Z")
-        for lst in [self.namespace.keys(),
-                    self.global_namespace.keys()]:
-            shortened = {"_".join([sub[0] for sub in word.split('_')]) : word
-                         for word in lst if snake_case_re.match(word)}
+        for lst in [list(self.namespace.keys()), list(self.global_namespace.keys())]:
+            shortened = {
+                "_".join([sub[0] for sub in word.split("_")]): word
+                for word in lst
+                if snake_case_re.match(word)
+            }
             for word in shortened.keys():
                 if word[:n] == text and word != "__builtins__":
                     match_append(shortened[word])
         return matches
 
     def attr_matches(self, text):
         """Compute matches when text contains a dot.
 
         Assuming the text is of the form NAME.NAME....[NAME], and is
         evaluatable in self.namespace or self.global_namespace, it will be
         evaluated and its attributes (as revealed by dir()) are used as
         possible completions.  (For class instances, class members are
         also considered.)
 
         WARNING: this can still invoke arbitrary C code, if an object
         with a __getattr__ hook is evaluated.
 
         """
 
         # Another option, seems to work great. Catches things like ''.<tab>
         m = re.match(r"(\S+(\.\w+)*)\.(\w*)$", text)
 
         if m:
             expr, attr = m.group(1, 3)
         elif self.greedy:
             m2 = re.match(r"(.+)\.(\w*)$", self.line_buffer)
             if not m2:
                 return []
             expr, attr = m2.group(1,2)
         else:
             return []
 
         try:
             obj = eval(expr, self.namespace)
         except:
             try:
                 obj = eval(expr, self.global_namespace)
             except:
                 return []
 
         if self.limit_to__all__ and hasattr(obj, '__all__'):
             words = get__all__entries(obj)
         else:
             words = dir2(obj)
 
         try:
             words = generics.complete_object(obj, words)
         except TryNext:
             pass
         except AssertionError:
             raise
         except Exception:
             # Silence errors from completion function
             #raise # dbg
             pass
         # Build match list to return
         n = len(attr)
         return [u"%s.%s" % (expr, w) for w in words if w[:n] == attr ]
 
 
 def get__all__entries(obj):
     """returns the strings in the __all__ attribute"""
     try:
         words = getattr(obj, '__all__')
     except:
         return []
 
     return [w for w in words if isinstance(w, str)]
 
 
 def match_dict_keys(keys: List[Union[str, bytes, Tuple[Union[str, bytes]]]], prefix: str, delims: str,
                     extra_prefix: Optional[Tuple[str, bytes]]=None) -> Tuple[str, int, List[str]]:
     """Used by dict_key_matches, matching the prefix to a list of keys
 
     Parameters
     ----------
     keys
         list of keys in dictionary currently being completed.
     prefix
         Part of the text already typed by the user. E.g. `mydict[b'fo`
     delims
         String of delimiters to consider when finding the current key.
     extra_prefix : optional
         Part of the text already typed in multi-key index cases. E.g. for
         `mydict['foo', "bar", 'b`, this would be `('foo', 'bar')`.
 
     Returns
     -------
     A tuple of three elements: ``quote``, ``token_start``, ``matched``, with
     ``quote`` being the quote that need to be used to close current string.
     ``token_start`` the position where the replacement should start occurring,
     ``matches`` a list of replacement/completion
 
     """
     prefix_tuple = extra_prefix if extra_prefix else ()
     Nprefix = len(prefix_tuple)
     def filter_prefix_tuple(key):
         # Reject too short keys
         if len(key) <= Nprefix:
             return False
         # Reject keys with non str/bytes in it
         for k in key:
             if not isinstance(k, (str, bytes)):
                 return False
         # Reject keys that do not match the prefix
         for k, pt in zip(key, prefix_tuple):
             if k != pt:
                 return False
         # All checks passed!
         return True
 
     filtered_keys:List[Union[str,bytes]] = []
     def _add_to_filtered_keys(key):
         if isinstance(key, (str, bytes)):
             filtered_keys.append(key)
 
     for k in keys:
         if isinstance(k, tuple):
             if filter_prefix_tuple(k):
                 _add_to_filtered_keys(k[Nprefix])
         else:
             _add_to_filtered_keys(k)
 
     if not prefix:
         return '', 0, [repr(k) for k in filtered_keys]
     quote_match = re.search('["\']', prefix)
     assert quote_match is not None # silence mypy
     quote = quote_match.group()
     try:
         prefix_str = eval(prefix + quote, {})
     except Exception:
         return '', 0, []
 
     pattern = '[^' + ''.join('\\' + c for c in delims) + ']*$'
     token_match = re.search(pattern, prefix, re.UNICODE)
     assert token_match is not None # silence mypy
     token_start = token_match.start()
     token_prefix = token_match.group()
 
     matched:List[str] = []
     for key in filtered_keys:
         try:
             if not key.startswith(prefix_str):
                 continue
         except (AttributeError, TypeError, UnicodeError):
             # Python 3+ TypeError on b'a'.startswith('a') or vice-versa
             continue
 
         # reformat remainder of key to begin with prefix
         rem = key[len(prefix_str):]
         # force repr wrapped in '
         rem_repr = repr(rem + '"') if isinstance(rem, str) else repr(rem + b'"')
         rem_repr = rem_repr[1 + rem_repr.index("'"):-2]
         if quote == '"':
             # The entered prefix is quoted with ",
             # but the match is quoted with '.
             # A contained " hence needs escaping for comparison:
             rem_repr = rem_repr.replace('"', '\\"')
 
         # then reinsert prefix from start of token
         matched.append('%s%s' % (token_prefix, rem_repr))
     return quote, token_start, matched
 
 
 def cursor_to_position(text:str, line:int, column:int)->int:
     """
     Convert the (line,column) position of the cursor in text to an offset in a
     string.
 
     Parameters
     ----------
     text : str
         The text in which to calculate the cursor offset
     line : int
         Line of the cursor; 0-indexed
     column : int
         Column of the cursor 0-indexed
 
     Returns
     -------
     Position of the cursor in ``text``, 0-indexed.
 
     See Also
     --------
     position_to_cursor : reciprocal of this function
 
     """
     lines = text.split('\n')
     assert line <= len(lines), '{} <= {}'.format(str(line), str(len(lines)))
 
     return sum(len(l) + 1 for l in lines[:line]) + column
 
 def position_to_cursor(text:str, offset:int)->Tuple[int, int]:
     """
     Convert the position of the cursor in text (0 indexed) to a line
     number(0-indexed) and a column number (0-indexed) pair
 
     Position should be a valid position in ``text``.
 
     Parameters
     ----------
     text : str
         The text in which to calculate the cursor offset
     offset : int
         Position of the cursor in ``text``, 0-indexed.
 
     Returns
     -------
     (line, column) : (int, int)
         Line of the cursor; 0-indexed, column of the cursor 0-indexed
 
     See Also
     --------
     cursor_to_position : reciprocal of this function
 
     """
 
     assert 0 <= offset <= len(text) , "0 <= %s <= %s" % (offset , len(text))
 
     before = text[:offset]
     blines = before.split('\n')  # ! splitnes trim trailing \n
     line = before.count('\n')
     col = len(blines[-1])
     return line, col
 
 
 def _safe_isinstance(obj, module, class_name):
     """Checks if obj is an instance of module.class_name if loaded
     """
     return (module in sys.modules and
             isinstance(obj, getattr(import_module(module), class_name)))
 
 
 @context_matcher()
 def back_unicode_name_matcher(context):
     """Match Unicode characters back to Unicode name
 
     Same as ``back_unicode_name_matches``, but adopted to new Matcher API.
     """
     fragment, matches = back_unicode_name_matches(context.token)
     return _convert_matcher_v1_result_to_v2(
         matches, type="unicode", fragment=fragment, suppress_if_matches=True
     )
 
 
 def back_unicode_name_matches(text: str) -> Tuple[str, Sequence[str]]:
     """Match Unicode characters back to Unicode name
 
     This does  ``☃`` -> ``\\snowman``
 
     Note that snowman is not a valid python3 combining character but will be expanded.
     Though it will not recombine back to the snowman character by the completion machinery.
 
     This will not either back-complete standard sequences like \\n, \\b ...
 
     Returns
     =======
 
     Return a tuple with two elements:
 
     - The Unicode character that was matched (preceded with a backslash), or
         empty string,
     - a sequence (of 1), name for the match Unicode character, preceded by
         backslash, or empty if no match.
     
     """
     if len(text)<2:
         return '', ()
     maybe_slash = text[-2]
     if maybe_slash != '\\':
         return '', ()
 
     char = text[-1]
     # no expand on quote for completion in strings.
     # nor backcomplete standard ascii keys
     if char in string.ascii_letters or char in ('"',"'"):
         return '', ()
     try :
         unic = unicodedata.name(char)
         return '\\'+char,('\\'+unic,)
     except KeyError:
         pass
     return '', ()
 
 
 @context_matcher()
 def back_latex_name_matcher(context):
     """Match latex characters back to unicode name
 
     Same as ``back_latex_name_matches``, but adopted to new Matcher API.
     """
     fragment, matches = back_latex_name_matches(context.token)
     return _convert_matcher_v1_result_to_v2(
         matches, type="latex", fragment=fragment, suppress_if_matches=True
     )
 
 
 def back_latex_name_matches(text: str) -> Tuple[str, Sequence[str]]:
     """Match latex characters back to unicode name
 
     This does ``\\ℵ`` -> ``\\aleph``
 
     """
     if len(text)<2:
         return '', ()
     maybe_slash = text[-2]
     if maybe_slash != '\\':
         return '', ()
 
 
     char = text[-1]
     # no expand on quote for completion in strings.
     # nor backcomplete standard ascii keys
     if char in string.ascii_letters or char in ('"',"'"):
         return '', ()
     try :
         latex = reverse_latex_symbol[char]
         # '\\' replace the \ as well
         return '\\'+char,[latex]
     except KeyError:
         pass
     return '', ()
 
 
 def _formatparamchildren(parameter) -> str:
     """
     Get parameter name and value from Jedi Private API
 
     Jedi does not expose a simple way to get `param=value` from its API.
 
     Parameters
     ----------
     parameter
         Jedi's function `Param`
 
     Returns
     -------
     A string like 'a', 'b=1', '*args', '**kwargs'
 
     """
     description = parameter.description
     if not description.startswith('param '):
         raise ValueError('Jedi function parameter description have change format.'
                          'Expected "param ...", found %r".' % description)
     return description[6:]
 
 def _make_signature(completion)-> str:
     """
     Make the signature from a jedi completion
 
     Parameters
     ----------
     completion : jedi.Completion
         object does not complete a function type
 
     Returns
     -------
     a string consisting of the function signature, with the parenthesis but
     without the function name. example:
     `(a, *args, b=1, **kwargs)`
 
     """
 
     # it looks like this might work on jedi 0.17
     if hasattr(completion, 'get_signatures'):
         signatures = completion.get_signatures()
         if not signatures:
             return  '(?)'
 
         c0 = completion.get_signatures()[0]
         return '('+c0.to_string().split('(', maxsplit=1)[1]
 
     return '(%s)'% ', '.join([f for f in (_formatparamchildren(p) for signature in completion.get_signatures()
                                           for p in signature.defined_names()) if f])
 
 
 _CompleteResult = Dict[str, MatcherResult]
 
 
 def _convert_matcher_v1_result_to_v2(
     matches: Sequence[str],
     type: str,
     fragment: str = None,
     suppress_if_matches: bool = False,
 ) -> SimpleMatcherResult:
     """Utility to help with transition"""
     result = {
         "completions": [SimpleCompletion(text=match, type=type) for match in matches],
         "suppress": (True if matches else False) if suppress_if_matches else False,
     }
     if fragment is not None:
         result["matched_fragment"] = fragment
     return result
 
 
 class IPCompleter(Completer):
     """Extension of the completer class with IPython-specific features"""
 
     __dict_key_regexps: Optional[Dict[bool,Pattern]] = None
 
     @observe('greedy')
     def _greedy_changed(self, change):
         """update the splitter and readline delims when greedy is changed"""
         if change['new']:
             self.splitter.delims = GREEDY_DELIMS
         else:
             self.splitter.delims = DELIMS
 
     dict_keys_only = Bool(
         False,
         help="""
         Whether to show dict key matches only.
         
         (disables all matchers except for `IPCompleter.dict_key_matcher`).
         """,
     )
 
     suppress_competing_matchers = UnionTrait(
         [Bool(allow_none=True), DictTrait(Bool(None, allow_none=True))],
         default_value=None,
         help="""
         Whether to suppress completions from other *Matchers*.
 
         When set to ``None`` (default) the matchers will attempt to auto-detect
         whether suppression of other matchers is desirable. For example, at
         the beginning of a line followed by `%` we expect a magic completion
         to be the only applicable option, and after ``my_dict['`` we usually
         expect a completion with an existing dictionary key.
 
         If you want to disable this heuristic and see completions from all matchers,
         set ``IPCompleter.suppress_competing_matchers = False``.
         To disable the heuristic for specific matchers provide a dictionary mapping:
         ``IPCompleter.suppress_competing_matchers = {'IPCompleter.dict_key_matcher': False}``.
 
         Set ``IPCompleter.suppress_competing_matchers = True`` to limit
         completions to the set of matchers with the highest priority;
         this is equivalent to ``IPCompleter.merge_completions`` and
         can be beneficial for performance, but will sometimes omit relevant
         candidates from matchers further down the priority list.
         """,
     ).tag(config=True)
 
     merge_completions = Bool(
         True,
         help="""Whether to merge completion results into a single list
 
         If False, only the completion results from the first non-empty
         completer will be returned.
         
         As of version 8.6.0, setting the value to ``False`` is an alias for:
         ``IPCompleter.suppress_competing_matchers = True.``.
         """,
     ).tag(config=True)
 
     disable_matchers = ListTrait(
         Unicode(), help="""List of matchers to disable."""
     ).tag(config=True)
 
     omit__names = Enum(
         (0, 1, 2),
         default_value=2,
         help="""Instruct the completer to omit private method names
 
         Specifically, when completing on ``object.<tab>``.
 
         When 2 [default]: all names that start with '_' will be excluded.
 
         When 1: all 'magic' names (``__foo__``) will be excluded.
 
         When 0: nothing will be excluded.
         """
     ).tag(config=True)
     limit_to__all__ = Bool(False,
         help="""
         DEPRECATED as of version 5.0.
 
         Instruct the completer to use __all__ for the completion
 
         Specifically, when completing on ``object.<tab>``.
 
         When True: only those names in obj.__all__ will be included.
 
         When False [default]: the __all__ attribute is ignored
         """,
     ).tag(config=True)
 
     profile_completions = Bool(
         default_value=False,
         help="If True, emit profiling data for completion subsystem using cProfile."
     ).tag(config=True)
 
     profiler_output_dir = Unicode(
         default_value=".completion_profiles",
         help="Template for path at which to output profile data for completions."
     ).tag(config=True)
 
     @observe('limit_to__all__')
     def _limit_to_all_changed(self, change):
         warnings.warn('`IPython.core.IPCompleter.limit_to__all__` configuration '
             'value has been deprecated since IPython 5.0, will be made to have '
             'no effects and then removed in future version of IPython.',
             UserWarning)
 
     def __init__(
         self, shell=None, namespace=None, global_namespace=None, config=None, **kwargs
     ):
         """IPCompleter() -> completer
 
         Return a completer object.
 
         Parameters
         ----------
         shell
             a pointer to the ipython shell itself.  This is needed
             because this completer knows about magic functions, and those can
             only be accessed via the ipython instance.
         namespace : dict, optional
             an optional dict where completions are performed.
         global_namespace : dict, optional
             secondary optional dict for completions, to
             handle cases (such as IPython embedded inside functions) where
             both Python scopes are visible.
         config : Config
             traitlet's config object
         **kwargs
             passed to super class unmodified.
         """
 
         self.magic_escape = ESC_MAGIC
         self.splitter = CompletionSplitter()
 
         # _greedy_changed() depends on splitter and readline being defined:
         super().__init__(
             namespace=namespace,
             global_namespace=global_namespace,
             config=config,
             **kwargs,
         )
 
         # List where completion matches will be stored
         self.matches = []
         self.shell = shell
         # Regexp to split filenames with spaces in them
         self.space_name_re = re.compile(r'([^\\] )')
         # Hold a local ref. to glob.glob for speed
         self.glob = glob.glob
 
         # Determine if we are running on 'dumb' terminals, like (X)Emacs
         # buffers, to avoid completion problems.
         term = os.environ.get('TERM','xterm')
         self.dumb_terminal = term in ['dumb','emacs']
 
         # Special handling of backslashes needed in win32 platforms
         if sys.platform == "win32":
             self.clean_glob = self._clean_glob_win32
         else:
             self.clean_glob = self._clean_glob
 
         #regexp to parse docstring for function signature
         self.docstring_sig_re = re.compile(r'^[\w|\s.]+\(([^)]*)\).*')
         self.docstring_kwd_re = re.compile(r'[\s|\[]*(\w+)(?:\s*=\s*.*)')
         #use this if positional argument name is also needed
         #= re.compile(r'[\s|\[]*(\w+)(?:\s*=?\s*.*)')
 
         self.magic_arg_matchers = [
             self.magic_config_matcher,
             self.magic_color_matcher,
         ]
 
         # This is set externally by InteractiveShell
         self.custom_completers = None
 
         # This is a list of names of unicode characters that can be completed
         # into their corresponding unicode value. The list is large, so we
         # lazily initialize it on first use. Consuming code should access this
         # attribute through the `@unicode_names` property.
         self._unicode_names = None
 
         self._backslash_combining_matchers = [
             self.latex_name_matcher,
             self.unicode_name_matcher,
             back_latex_name_matcher,
             back_unicode_name_matcher,
             self.fwd_unicode_matcher,
         ]
 
         if not self.backslash_combining_completions:
             for matcher in self._backslash_combining_matchers:
                 self.disable_matchers.append(matcher.matcher_identifier)
 
         if not self.merge_completions:
             self.suppress_competing_matchers = True
 
     @property
     def matchers(self) -> List[Matcher]:
         """All active matcher routines for completion"""
         if self.dict_keys_only:
             return [self.dict_key_matcher]
 
         if self.use_jedi:
             return [
                 *self.custom_matchers,
                 *self._backslash_combining_matchers,
                 *self.magic_arg_matchers,
                 self.custom_completer_matcher,
                 self.magic_matcher,
                 self._jedi_matcher,
                 self.dict_key_matcher,
                 self.file_matcher,
             ]
         else:
             return [
                 *self.custom_matchers,
                 *self._backslash_combining_matchers,
                 *self.magic_arg_matchers,
                 self.custom_completer_matcher,
                 self.dict_key_matcher,
                 # TODO: convert python_matches to v2 API
                 self.magic_matcher,
                 self.python_matches,
                 self.file_matcher,
                 self.python_func_kw_matcher,
             ]
 
     def all_completions(self, text:str) -> List[str]:
         """
         Wrapper around the completion methods for the benefit of emacs.
         """
         prefix = text.rpartition('.')[0]
         with provisionalcompleter():
             return ['.'.join([prefix, c.text]) if prefix and self.use_jedi else c.text
                     for c in self.completions(text, len(text))]
 
         return self.complete(text)[1]
 
     def _clean_glob(self, text:str):
         return self.glob("%s*" % text)
 
     def _clean_glob_win32(self, text:str):
         return [f.replace("\\","/")
                 for f in self.glob("%s*" % text)]
 
     @context_matcher()
     def file_matcher(self, context: CompletionContext) -> SimpleMatcherResult:
         """Same as ``file_matches``, but adopted to new Matcher API."""
         matches = self.file_matches(context.token)
         # TODO: add a heuristic for suppressing (e.g. if it has OS-specific delimiter,
         #  starts with `/home/`, `C:\`, etc)
         return _convert_matcher_v1_result_to_v2(matches, type="path")
 
     def file_matches(self, text: str) -> List[str]:
         """Match filenames, expanding ~USER type strings.
 
         Most of the seemingly convoluted logic in this completer is an
         attempt to handle filenames with spaces in them.  And yet it's not
         quite perfect, because Python's readline doesn't expose all of the
         GNU readline details needed for this to be done correctly.
 
         For a filename with a space in it, the printed completions will be
         only the parts after what's already been typed (instead of the
         full completions, as is normally done).  I don't think with the
         current (as of Python 2.3) Python readline it's possible to do
         better.
 
         DEPRECATED: Deprecated since 8.6. Use ``file_matcher`` instead.
         """
 
         # chars that require escaping with backslash - i.e. chars
         # that readline treats incorrectly as delimiters, but we
         # don't want to treat as delimiters in filename matching
         # when escaped with backslash
         if text.startswith('!'):
             text = text[1:]
             text_prefix = u'!'
         else:
             text_prefix = u''
 
         text_until_cursor = self.text_until_cursor
         # track strings with open quotes
         open_quotes = has_open_quotes(text_until_cursor)
 
         if '(' in text_until_cursor or '[' in text_until_cursor:
             lsplit = text
         else:
             try:
                 # arg_split ~ shlex.split, but with unicode bugs fixed by us
                 lsplit = arg_split(text_until_cursor)[-1]
             except ValueError:
                 # typically an unmatched ", or backslash without escaped char.
                 if open_quotes:
                     lsplit = text_until_cursor.split(open_quotes)[-1]
                 else:
                     return []
             except IndexError:
                 # tab pressed on empty line
                 lsplit = ""
 
         if not open_quotes and lsplit != protect_filename(lsplit):
             # if protectables are found, do matching on the whole escaped name
             has_protectables = True
             text0,text = text,lsplit
         else:
             has_protectables = False
             text = os.path.expanduser(text)
 
         if text == "":
             return [text_prefix + protect_filename(f) for f in self.glob("*")]
 
         # Compute the matches from the filesystem
         if sys.platform == 'win32':
             m0 = self.clean_glob(text)
         else:
             m0 = self.clean_glob(text.replace('\\', ''))
 
         if has_protectables:
             # If we had protectables, we need to revert our changes to the
             # beginning of filename so that we don't double-write the part
             # of the filename we have so far
             len_lsplit = len(lsplit)
             matches = [text_prefix + text0 +
                        protect_filename(f[len_lsplit:]) for f in m0]
         else:
             if open_quotes:
                 # if we have a string with an open quote, we don't need to
                 # protect the names beyond the quote (and we _shouldn't_, as
                 # it would cause bugs when the filesystem call is made).
                 matches = m0 if sys.platform == "win32" else\
                     [protect_filename(f, open_quotes) for f in m0]
             else:
                 matches = [text_prefix +
                            protect_filename(f) for f in m0]
 
         # Mark directories in input list by appending '/' to their names.
         return [x+'/' if os.path.isdir(x) else x for x in matches]
 
     @context_matcher()
     def magic_matcher(self, context: CompletionContext) -> SimpleMatcherResult:
         text = context.token
         matches = self.magic_matches(text)
         result = _convert_matcher_v1_result_to_v2(matches, type="magic")
         is_magic_prefix = len(text) > 0 and text[0] == "%"
         result["suppress"] = is_magic_prefix and bool(result["completions"])
         return result
 
     def magic_matches(self, text: str):
         """Match magics.
 
         DEPRECATED: Deprecated since 8.6. Use ``magic_matcher`` instead.
         """
         # Get all shell magics now rather than statically, so magics loaded at
         # runtime show up too.
         lsm = self.shell.magics_manager.lsmagic()
         line_magics = lsm['line']
         cell_magics = lsm['cell']
         pre = self.magic_escape
         pre2 = pre+pre
 
         explicit_magic = text.startswith(pre)
 
         # Completion logic:
         # - user gives %%: only do cell magics
         # - user gives %: do both line and cell magics
         # - no prefix: do both
         # In other words, line magics are skipped if the user gives %% explicitly
         #
         # We also exclude magics that match any currently visible names:
         # https://github.com/ipython/ipython/issues/4877, unless the user has
         # typed a %:
         # https://github.com/ipython/ipython/issues/10754
         bare_text = text.lstrip(pre)
         global_matches = self.global_matches(bare_text)
         if not explicit_magic:
             def matches(magic):
                 """
                 Filter magics, in particular remove magics that match
                 a name present in global namespace.
                 """
                 return ( magic.startswith(bare_text) and
                          magic not in global_matches )
         else:
             def matches(magic):
                 return magic.startswith(bare_text)
 
         comp = [ pre2+m for m in cell_magics if matches(m)]
         if not text.startswith(pre2):
             comp += [ pre+m for m in line_magics if matches(m)]
 
         return comp
 
     @context_matcher()
     def magic_config_matcher(self, context: CompletionContext) -> SimpleMatcherResult:
         """Match class names and attributes for %config magic."""
         # NOTE: uses `line_buffer` equivalent for compatibility
         matches = self.magic_config_matches(context.line_with_cursor)
         return _convert_matcher_v1_result_to_v2(matches, type="param")
 
     def magic_config_matches(self, text: str) -> List[str]:
         """Match class names and attributes for %config magic.
 
         DEPRECATED: Deprecated since 8.6. Use ``magic_config_matcher`` instead.
         """
         texts = text.strip().split()
 
         if len(texts) > 0 and (texts[0] == 'config' or texts[0] == '%config'):
             # get all configuration classes
             classes = sorted(set([ c for c in self.shell.configurables
                                    if c.__class__.class_traits(config=True)
                                    ]), key=lambda x: x.__class__.__name__)
             classnames = [ c.__class__.__name__ for c in classes ]
 
             # return all classnames if config or %config is given
             if len(texts) == 1:
                 return classnames
 
             # match classname
             classname_texts = texts[1].split('.')
             classname = classname_texts[0]
             classname_matches = [ c for c in classnames
                                   if c.startswith(classname) ]
 
             # return matched classes or the matched class with attributes
             if texts[1].find('.') < 0:
                 return classname_matches
             elif len(classname_matches) == 1 and \
                             classname_matches[0] == classname:
                 cls = classes[classnames.index(classname)].__class__
                 help = cls.class_get_help()
                 # strip leading '--' from cl-args:
                 help = re.sub(re.compile(r'^--', re.MULTILINE), '', help)
                 return [ attr.split('=')[0]
                          for attr in help.strip().splitlines()
                          if attr.startswith(texts[1]) ]
         return []
 
     @context_matcher()
     def magic_color_matcher(self, context: CompletionContext) -> SimpleMatcherResult:
         """Match color schemes for %colors magic."""
         # NOTE: uses `line_buffer` equivalent for compatibility
         matches = self.magic_color_matches(context.line_with_cursor)
         return _convert_matcher_v1_result_to_v2(matches, type="param")
 
     def magic_color_matches(self, text: str) -> List[str]:
         """Match color schemes for %colors magic.
 
         DEPRECATED: Deprecated since 8.6. Use ``magic_color_matcher`` instead.
         """
         texts = text.split()
         if text.endswith(' '):
             # .split() strips off the trailing whitespace. Add '' back
             # so that: '%colors ' -> ['%colors', '']
             texts.append('')
 
         if len(texts) == 2 and (texts[0] == 'colors' or texts[0] == '%colors'):
             prefix = texts[1]
             return [ color for color in InspectColors.keys()
                      if color.startswith(prefix) ]
         return []
 
     @context_matcher(identifier="IPCompleter.jedi_matcher")
     def _jedi_matcher(self, context: CompletionContext) -> _JediMatcherResult:
         matches = self._jedi_matches(
             cursor_column=context.cursor_position,
             cursor_line=context.cursor_line,
             text=context.full_text,
         )
         return {
             "completions": matches,
             # static analysis should not suppress other matchers
             "suppress": False,
         }
 
     def _jedi_matches(
         self, cursor_column: int, cursor_line: int, text: str
     ) -> Iterable[_JediCompletionLike]:
         """
         Return a list of :any:`jedi.api.Completion`s object from a ``text`` and
         cursor position.
 
         Parameters
         ----------
         cursor_column : int
             column position of the cursor in ``text``, 0-indexed.
         cursor_line : int
             line position of the cursor in ``text``, 0-indexed
         text : str
             text to complete
 
         Notes
         -----
         If ``IPCompleter.debug`` is ``True`` may return a :any:`_FakeJediCompletion`
         object containing a string with the Jedi debug information attached.
 
         DEPRECATED: Deprecated since 8.6. Use ``_jedi_matcher`` instead.
         """
         namespaces = [self.namespace]
         if self.global_namespace is not None:
             namespaces.append(self.global_namespace)
 
         completion_filter = lambda x:x
         offset = cursor_to_position(text, cursor_line, cursor_column)
         # filter output if we are completing for object members
         if offset:
             pre = text[offset-1]
             if pre == '.':
                 if self.omit__names == 2:
                     completion_filter = lambda c:not c.name.startswith('_')
                 elif self.omit__names == 1:
                     completion_filter = lambda c:not (c.name.startswith('__') and c.name.endswith('__'))
                 elif self.omit__names == 0:
                     completion_filter = lambda x:x
                 else:
                     raise ValueError("Don't understand self.omit__names == {}".format(self.omit__names))
 
         interpreter = jedi.Interpreter(text[:offset], namespaces)
         try_jedi = True
 
         try:
             # find the first token in the current tree -- if it is a ' or " then we are in a string
             completing_string = False
             try:
                 first_child = next(c for c in interpreter._get_module().tree_node.children if hasattr(c, 'value'))
             except StopIteration:
                 pass
             else:
                 # note the value may be ', ", or it may also be ''' or """, or
                 # in some cases, """what/you/typed..., but all of these are
                 # strings.
                 completing_string = len(first_child.value) > 0 and first_child.value[0] in {"'", '"'}
 
             # if we are in a string jedi is likely not the right candidate for
             # now. Skip it.
             try_jedi = not completing_string
         except Exception as e:
             # many of things can go wrong, we are using private API just don't crash.
             if self.debug:
                 print("Error detecting if completing a non-finished string :", e, '|')
 
         if not try_jedi:
             return []
         try:
             return filter(completion_filter, interpreter.complete(column=cursor_column, line=cursor_line + 1))
         except Exception as e:
             if self.debug:
                 return [_FakeJediCompletion('Oops Jedi has crashed, please report a bug with the following:\n"""\n%s\ns"""' % (e))]
             else:
                 return []
 
     def python_matches(self, text:str)->List[str]:
         """Match attributes or global python names"""
         if "." in text:
             try:
                 matches = self.attr_matches(text)
                 if text.endswith('.') and self.omit__names:
                     if self.omit__names == 1:
                         # true if txt is _not_ a __ name, false otherwise:
                         no__name = (lambda txt:
                                     re.match(r'.*\.__.*?__',txt) is None)
                     else:
                         # true if txt is _not_ a _ name, false otherwise:
                         no__name = (lambda txt:
                                     re.match(r'\._.*?',txt[txt.rindex('.'):]) is None)
                     matches = filter(no__name, matches)
             except NameError:
                 # catches <undefined attributes>.<tab>
                 matches = []
         else:
             matches = self.global_matches(text)
         return matches
 
     def _default_arguments_from_docstring(self, doc):
         """Parse the first line of docstring for call signature.
 
         Docstring should be of the form 'min(iterable[, key=func])\n'.
         It can also parse cython docstring of the form
         'Minuit.migrad(self, int ncall=10000, resume=True, int nsplit=1)'.
         """
         if doc is None:
             return []
 
         #care only the firstline
         line = doc.lstrip().splitlines()[0]
 
         #p = re.compile(r'^[\w|\s.]+\(([^)]*)\).*')
         #'min(iterable[, key=func])\n' -> 'iterable[, key=func]'
         sig = self.docstring_sig_re.search(line)
         if sig is None:
             return []
         # iterable[, key=func]' -> ['iterable[' ,' key=func]']
         sig = sig.groups()[0].split(',')
         ret = []
         for s in sig:
             #re.compile(r'[\s|\[]*(\w+)(?:\s*=\s*.*)')
             ret += self.docstring_kwd_re.findall(s)
         return ret
 
     def _default_arguments(self, obj):
         """Return the list of default arguments of obj if it is callable,
         or empty list otherwise."""
         call_obj = obj
         ret = []
         if inspect.isbuiltin(obj):
             pass
         elif not (inspect.isfunction(obj) or inspect.ismethod(obj)):
             if inspect.isclass(obj):
                 #for cython embedsignature=True the constructor docstring
                 #belongs to the object itself not __init__
                 ret += self._default_arguments_from_docstring(
                             getattr(obj, '__doc__', ''))
                 # for classes, check for __init__,__new__
                 call_obj = (getattr(obj, '__init__', None) or
                        getattr(obj, '__new__', None))
             # for all others, check if they are __call__able
             elif hasattr(obj, '__call__'):
                 call_obj = obj.__call__
         ret += self._default_arguments_from_docstring(
                  getattr(call_obj, '__doc__', ''))
 
         _keeps = (inspect.Parameter.KEYWORD_ONLY,
                   inspect.Parameter.POSITIONAL_OR_KEYWORD)
 
         try:
             sig = inspect.signature(obj)
             ret.extend(k for k, v in sig.parameters.items() if
                        v.kind in _keeps)
         except ValueError:
             pass
 
         return list(set(ret))
 
     @context_matcher()
     def python_func_kw_matcher(self, context: CompletionContext) -> SimpleMatcherResult:
         """Match named parameters (kwargs) of the last open function."""
         matches = self.python_func_kw_matches(context.token)
         return _convert_matcher_v1_result_to_v2(matches, type="param")
 
     def python_func_kw_matches(self, text):
         """Match named parameters (kwargs) of the last open function.
 
         DEPRECATED: Deprecated since 8.6. Use ``magic_config_matcher`` instead.
         """
 
         if "." in text: # a parameter cannot be dotted
             return []
         try: regexp = self.__funcParamsRegex
         except AttributeError:
             regexp = self.__funcParamsRegex = re.compile(r'''
                 '.*?(?<!\\)' |    # single quoted strings or
                 ".*?(?<!\\)" |    # double quoted strings or
                 \w+          |    # identifier
                 \S                # other characters
                 ''', re.VERBOSE | re.DOTALL)
         # 1. find the nearest identifier that comes before an unclosed
         # parenthesis before the cursor
         # e.g. for "foo (1+bar(x), pa<cursor>,a=1)", the candidate is "foo"
         tokens = regexp.findall(self.text_until_cursor)
         iterTokens = reversed(tokens); openPar = 0
 
         for token in iterTokens:
             if token == ')':
                 openPar -= 1
             elif token == '(':
                 openPar += 1
                 if openPar > 0:
                     # found the last unclosed parenthesis
                     break
         else:
             return []
         # 2. Concatenate dotted names ("foo.bar" for "foo.bar(x, pa" )
         ids = []
         isId = re.compile(r'\w+$').match
 
         while True:
             try:
                 ids.append(next(iterTokens))
                 if not isId(ids[-1]):
                     ids.pop(); break
                 if not next(iterTokens) == '.':
                     break
             except StopIteration:
                 break
 
         # Find all named arguments already assigned to, as to avoid suggesting
         # them again
         usedNamedArgs = set()
         par_level = -1
         for token, next_token in zip(tokens, tokens[1:]):
             if token == '(':
                 par_level += 1
             elif token == ')':
                 par_level -= 1
 
             if par_level != 0:
                 continue
 
             if next_token != '=':
                 continue
 
             usedNamedArgs.add(token)
 
         argMatches = []
         try:
             callableObj = '.'.join(ids[::-1])
             namedArgs = self._default_arguments(eval(callableObj,
                                                     self.namespace))
 
             # Remove used named arguments from the list, no need to show twice
             for namedArg in set(namedArgs) - usedNamedArgs:
                 if namedArg.startswith(text):
                     argMatches.append("%s=" %namedArg)
         except:
             pass
 
         return argMatches
 
     @staticmethod
     def _get_keys(obj: Any) -> List[Any]:
         # Objects can define their own completions by defining an
         # _ipy_key_completions_() method.
         method = get_real_method(obj, '_ipython_key_completions_')
         if method is not None:
             return method()
 
         # Special case some common in-memory dict-like types
         if isinstance(obj, dict) or\
            _safe_isinstance(obj, 'pandas', 'DataFrame'):
             try:
                 return list(obj.keys())
             except Exception:
                 return []
         elif _safe_isinstance(obj, 'numpy', 'ndarray') or\
              _safe_isinstance(obj, 'numpy', 'void'):
             return obj.dtype.names or []
         return []
 
     @context_matcher()
     def dict_key_matcher(self, context: CompletionContext) -> SimpleMatcherResult:
         """Match string keys in a dictionary, after e.g. ``foo[``."""
         matches = self.dict_key_matches(context.token)
         return _convert_matcher_v1_result_to_v2(
             matches, type="dict key", suppress_if_matches=True
         )
 
     def dict_key_matches(self, text: str) -> List[str]:
         """Match string keys in a dictionary, after e.g. ``foo[``.
 
         DEPRECATED: Deprecated since 8.6. Use `dict_key_matcher` instead.
         """
 
         if self.__dict_key_regexps is not None:
             regexps = self.__dict_key_regexps
         else:
             dict_key_re_fmt = r'''(?x)
             (  # match dict-referring expression wrt greedy setting
                 %s
             )
             \[   # open bracket
             \s*  # and optional whitespace
             # Capture any number of str-like objects (e.g. "a", "b", 'c')
             ((?:[uUbB]?  # string prefix (r not handled)
                 (?:
                     '(?:[^']|(?<!\\)\\')*'
                 |
                     "(?:[^"]|(?<!\\)\\")*"
                 )
                 \s*,\s*
             )*)
             ([uUbB]?  # string prefix (r not handled)
                 (?:   # unclosed string
                     '(?:[^']|(?<!\\)\\')*
                 |
                     "(?:[^"]|(?<!\\)\\")*
                 )
             )?
             $
             '''
             regexps = self.__dict_key_regexps = {
                 False: re.compile(dict_key_re_fmt % r'''
                                   # identifiers separated by .
                                   (?!\d)\w+
                                   (?:\.(?!\d)\w+)*
                                   '''),
                 True: re.compile(dict_key_re_fmt % '''
                                  .+
                                  ''')
             }
 
         match = regexps[self.greedy].search(self.text_until_cursor)
 
         if match is None:
             return []
 
         expr, prefix0, prefix = match.groups()
         try:
             obj = eval(expr, self.namespace)
         except Exception:
             try:
                 obj = eval(expr, self.global_namespace)
             except Exception:
                 return []
 
         keys = self._get_keys(obj)
         if not keys:
             return keys
 
         extra_prefix = eval(prefix0) if prefix0 != '' else None
 
         closing_quote, token_offset, matches = match_dict_keys(keys, prefix, self.splitter.delims, extra_prefix=extra_prefix)
         if not matches:
             return matches
 
         # get the cursor position of
         # - the text being completed
         # - the start of the key text
         # - the start of the completion
         text_start = len(self.text_until_cursor) - len(text)
         if prefix:
             key_start = match.start(3)
             completion_start = key_start + token_offset
         else:
             key_start = completion_start = match.end()
 
         # grab the leading prefix, to make sure all completions start with `text`
         if text_start > key_start:
             leading = ''
         else:
             leading = text[text_start:completion_start]
 
         # the index of the `[` character
         bracket_idx = match.end(1)
 
         # append closing quote and bracket as appropriate
         # this is *not* appropriate if the opening quote or bracket is outside
         # the text given to this method
         suf = ''
         continuation = self.line_buffer[len(self.text_until_cursor):]
         if key_start > text_start and closing_quote:
             # quotes were opened inside text, maybe close them
             if continuation.startswith(closing_quote):
                 continuation = continuation[len(closing_quote):]
             else:
                 suf += closing_quote
         if bracket_idx > text_start:
             # brackets were opened inside text, maybe close them
             if not continuation.startswith(']'):
                 suf += ']'
 
         return [leading + k + suf for k in matches]
 
     @context_matcher()
     def unicode_name_matcher(self, context):
         fragment, matches = self.unicode_name_matches(context.token)
         return _convert_matcher_v1_result_to_v2(
             matches, type="unicode", fragment=fragment, suppress_if_matches=True
         )
 
     @staticmethod
     def unicode_name_matches(text: str) -> Tuple[str, List[str]]:
         """Match Latex-like syntax for unicode characters base
         on the name of the character.
 
         This does  ``\\GREEK SMALL LETTER ETA`` -> ``η``
 
         Works only on valid python 3 identifier, or on combining characters that
         will combine to form a valid identifier.
         """
         slashpos = text.rfind('\\')
         if slashpos > -1:
             s = text[slashpos+1:]
             try :
                 unic = unicodedata.lookup(s)
                 # allow combining chars
                 if ('a'+unic).isidentifier():
                     return '\\'+s,[unic]
             except KeyError:
                 pass
         return '', []
 
     @context_matcher()
     def latex_name_matcher(self, context):
         """Match Latex syntax for unicode characters.
 
         This does both ``\\alp`` -> ``\\alpha`` and ``\\alpha`` -> ``α``
         """
         fragment, matches = self.latex_matches(context.token)
         return _convert_matcher_v1_result_to_v2(
             matches, type="latex", fragment=fragment, suppress_if_matches=True
         )
 
     def latex_matches(self, text: str) -> Tuple[str, Sequence[str]]:
         """Match Latex syntax for unicode characters.
 
         This does both ``\\alp`` -> ``\\alpha`` and ``\\alpha`` -> ``α``
 
         DEPRECATED: Deprecated since 8.6. Use `latex_matcher` instead.
         """
         slashpos = text.rfind('\\')
         if slashpos > -1:
             s = text[slashpos:]
             if s in latex_symbols:
                 # Try to complete a full latex symbol to unicode
                 # \\alpha -> α
                 return s, [latex_symbols[s]]
             else:
                 # If a user has partially typed a latex symbol, give them
                 # a full list of options \al -> [\aleph, \alpha]
                 matches = [k for k in latex_symbols if k.startswith(s)]
                 if matches:
                     return s, matches
         return '', ()
 
     @context_matcher()
     def custom_completer_matcher(self, context):
         matches = self.dispatch_custom_completer(context.token) or []
         result = _convert_matcher_v1_result_to_v2(
             matches, type="<unknown>", suppress_if_matches=True
         )
         result["ordered"] = True
         result["do_not_suppress"] = {_get_matcher_id(self._jedi_matcher)}
         return result
 
     def dispatch_custom_completer(self, text):
         """
         DEPRECATED: Deprecated since 8.6. Use `custom_completer_matcher` instead.
         """
         if not self.custom_completers:
             return
 
         line = self.line_buffer
         if not line.strip():
             return None
 
         # Create a little structure to pass all the relevant information about
         # the current completion to any custom completer.
         event = SimpleNamespace()
         event.line = line
         event.symbol = text
         cmd = line.split(None,1)[0]
         event.command = cmd
         event.text_until_cursor = self.text_until_cursor
 
         # for foo etc, try also to find completer for %foo
         if not cmd.startswith(self.magic_escape):
             try_magic = self.custom_completers.s_matches(
                 self.magic_escape + cmd)
         else:
             try_magic = []
 
         for c in itertools.chain(self.custom_completers.s_matches(cmd),
                  try_magic,
                  self.custom_completers.flat_matches(self.text_until_cursor)):
             try:
                 res = c(event)
                 if res:
                     # first, try case sensitive match
                     withcase = [r for r in res if r.startswith(text)]
                     if withcase:
                         return withcase
                     # if none, then case insensitive ones are ok too
                     text_low = text.lower()
                     return [r for r in res if r.lower().startswith(text_low)]
             except TryNext:
                 pass
             except KeyboardInterrupt:
                 """
                 If custom completer take too long,
                 let keyboard interrupt abort and return nothing.
                 """
                 break
 
         return None
 
     def completions(self, text: str, offset: int)->Iterator[Completion]:
         """
         Returns an iterator over the possible completions
 
         .. warning::
 
             Unstable
 
             This function is unstable, API may change without warning.
             It will also raise unless use in proper context manager.
 
         Parameters
         ----------
         text : str
             Full text of the current input, multi line string.
         offset : int
             Integer representing the position of the cursor in ``text``. Offset
             is 0-based indexed.
 
         Yields
         ------
         Completion
 
         Notes
         -----
         The cursor on a text can either be seen as being "in between"
         characters or "On" a character depending on the interface visible to
         the user. For consistency the cursor being on "in between" characters X
         and Y is equivalent to the cursor being "on" character Y, that is to say
         the character the cursor is on is considered as being after the cursor.
 
         Combining characters may span more that one position in the
         text.
 
         .. note::
 
             If ``IPCompleter.debug`` is :any:`True` will yield a ``--jedi/ipython--``
             fake Completion token to distinguish completion returned by Jedi
             and usual IPython completion.
 
         .. note::
 
             Completions are not completely deduplicated yet. If identical
             completions are coming from different sources this function does not
             ensure that each completion object will only be present once.
         """
         warnings.warn("_complete is a provisional API (as of IPython 6.0). "
                       "It may change without warnings. "
                       "Use in corresponding context manager.",
                       category=ProvisionalCompleterWarning, stacklevel=2)
 
         seen = set()
         profiler:Optional[cProfile.Profile]
         try:
             if self.profile_completions:
                 import cProfile
                 profiler = cProfile.Profile()
                 profiler.enable()
             else:
                 profiler = None
 
             for c in self._completions(text, offset, _timeout=self.jedi_compute_type_timeout/1000):
                 if c and (c in seen):
                     continue
                 yield c
                 seen.add(c)
         except KeyboardInterrupt:
             """if completions take too long and users send keyboard interrupt,
             do not crash and return ASAP. """
             pass
         finally:
             if profiler is not None:
                 profiler.disable()
                 ensure_dir_exists(self.profiler_output_dir)
                 output_path = os.path.join(self.profiler_output_dir, str(uuid.uuid4()))
                 print("Writing profiler output to", output_path)
                 profiler.dump_stats(output_path)
 
     def _completions(self, full_text: str, offset: int, *, _timeout) -> Iterator[Completion]:
         """
         Core completion module.Same signature as :any:`completions`, with the
         extra `timeout` parameter (in seconds).
 
         Computing jedi's completion ``.type`` can be quite expensive (it is a
         lazy property) and can require some warm-up, more warm up than just
         computing the ``name`` of a completion. The warm-up can be :
 
             - Long warm-up the first time a module is encountered after
             install/update: actually build parse/inference tree.
 
             - first time the module is encountered in a session: load tree from
             disk.
 
         We don't want to block completions for tens of seconds so we give the
         completer a "budget" of ``_timeout`` seconds per invocation to compute
         completions types, the completions that have not yet been computed will
         be marked as "unknown" an will have a chance to be computed next round
         are things get cached.
 
         Keep in mind that Jedi is not the only thing treating the completion so
         keep the timeout short-ish as if we take more than 0.3 second we still
         have lots of processing to do.
 
         """
         deadline = time.monotonic() + _timeout
 
         before = full_text[:offset]
         cursor_line, cursor_column = position_to_cursor(full_text, offset)
 
         jedi_matcher_id = _get_matcher_id(self._jedi_matcher)
 
         results = self._complete(
             full_text=full_text, cursor_line=cursor_line, cursor_pos=cursor_column
         )
         non_jedi_results: Dict[str, SimpleMatcherResult] = {
             identifier: result
             for identifier, result in results.items()
             if identifier != jedi_matcher_id
         }
 
         jedi_matches = (
             cast(results[jedi_matcher_id], _JediMatcherResult)["completions"]
             if jedi_matcher_id in results
             else ()
         )
 
         iter_jm = iter(jedi_matches)
         if _timeout:
             for jm in iter_jm:
                 try:
                     type_ = jm.type
                 except Exception:
                     if self.debug:
                         print("Error in Jedi getting type of ", jm)
                     type_ = None
                 delta = len(jm.name_with_symbols) - len(jm.complete)
                 if type_ == 'function':
                     signature = _make_signature(jm)
                 else:
                     signature = ''
                 yield Completion(start=offset - delta,
                                  end=offset,
                                  text=jm.name_with_symbols,
                                  type=type_,
                                  signature=signature,
                                  _origin='jedi')
 
                 if time.monotonic() > deadline:
                     break
 
         for jm in iter_jm:
             delta = len(jm.name_with_symbols) - len(jm.complete)
             yield Completion(
                 start=offset - delta,
                 end=offset,
                 text=jm.name_with_symbols,
                 type=_UNKNOWN_TYPE,  # don't compute type for speed
                 _origin="jedi",
                 signature="",
             )
 
         # TODO:
         # Suppress this, right now just for debug.
         if jedi_matches and non_jedi_results and self.debug:
             some_start_offset = before.rfind(
                 next(iter(non_jedi_results.values()))["matched_fragment"]
             )
             yield Completion(
                 start=some_start_offset,
                 end=offset,
                 text="--jedi/ipython--",
                 _origin="debug",
                 type="none",
                 signature="",
             )
 
         ordered = []
         sortable = []
 
         for origin, result in non_jedi_results.items():
             matched_text = result["matched_fragment"]
             start_offset = before.rfind(matched_text)
             is_ordered = result.get("ordered", False)
             container = ordered if is_ordered else sortable
 
             # I'm unsure if this is always true, so let's assert and see if it
             # crash
             assert before.endswith(matched_text)
 
             for simple_completion in result["completions"]:
                 completion = Completion(
                     start=start_offset,
                     end=offset,
                     text=simple_completion.text,
                     _origin=origin,
                     signature="",
                     type=simple_completion.type or _UNKNOWN_TYPE,
                 )
                 container.append(completion)
 
         yield from list(self._deduplicate(ordered + self._sort(sortable)))[
             :MATCHES_LIMIT
         ]
 
     def complete(self, text=None, line_buffer=None, cursor_pos=None) -> Tuple[str, Sequence[str]]:
         """Find completions for the given text and line context.
 
         Note that both the text and the line_buffer are optional, but at least
         one of them must be given.
 
         Parameters
         ----------
         text : string, optional
             Text to perform the completion on.  If not given, the line buffer
             is split using the instance's CompletionSplitter object.
         line_buffer : string, optional
             If not given, the completer attempts to obtain the current line
             buffer via readline.  This keyword allows clients which are
             requesting for text completions in non-readline contexts to inform
             the completer of the entire text.
         cursor_pos : int, optional
             Index of the cursor in the full line buffer.  Should be provided by
             remote frontends where kernel has no access to frontend state.
 
         Returns
         -------
         Tuple of two items:
         text : str
             Text that was actually used in the completion.
         matches : list
             A list of completion matches.
 
         Notes
         -----
             This API is likely to be deprecated and replaced by
             :any:`IPCompleter.completions` in the future.
 
         """
         warnings.warn('`Completer.complete` is pending deprecation since '
                 'IPython 6.0 and will be replaced by `Completer.completions`.',
                       PendingDeprecationWarning)
         # potential todo, FOLD the 3rd throw away argument of _complete
         # into the first 2 one.
         # TODO: Q: does the above refer to jedi completions (i.e. 0-indexed?)
         # TODO: should we deprecate now, or does it stay?
 
         results = self._complete(
             line_buffer=line_buffer, cursor_pos=cursor_pos, text=text, cursor_line=0
         )
 
         jedi_matcher_id = _get_matcher_id(self._jedi_matcher)
 
         return self._arrange_and_extract(
             results,
             # TODO: can we confirm that excluding Jedi here was a deliberate choice in previous version?
             skip_matchers={jedi_matcher_id},
             # this API does not support different start/end positions (fragments of token).
             abort_if_offset_changes=True,
         )
 
     def _arrange_and_extract(
         self,
         results: Dict[str, MatcherResult],
         skip_matchers: Set[str],
         abort_if_offset_changes: bool,
     ):
 
         sortable = []
         ordered = []
         most_recent_fragment = None
         for identifier, result in results.items():
             if identifier in skip_matchers:
                 continue
             if not result["completions"]:
                 continue
             if not most_recent_fragment:
                 most_recent_fragment = result["matched_fragment"]
             if (
                 abort_if_offset_changes
                 and result["matched_fragment"] != most_recent_fragment
             ):
                 break
             if result.get("ordered", False):
                 ordered.extend(result["completions"])
             else:
                 sortable.extend(result["completions"])
 
         if not most_recent_fragment:
             most_recent_fragment = ""  # to satisfy typechecker (and just in case)
 
         return most_recent_fragment, [
             m.text for m in self._deduplicate(ordered + self._sort(sortable))
         ]
 
     def _complete(self, *, cursor_line, cursor_pos, line_buffer=None, text=None,
                   full_text=None) -> _CompleteResult:
         """
         Like complete but can also returns raw jedi completions as well as the
         origin of the completion text. This could (and should) be made much
         cleaner but that will be simpler once we drop the old (and stateful)
         :any:`complete` API.
 
         With current provisional API, cursor_pos act both (depending on the
         caller) as the offset in the ``text`` or ``line_buffer``, or as the
         ``column`` when passing multiline strings this could/should be renamed
         but would add extra noise.
 
         Parameters
         ----------
         cursor_line
             Index of the line the cursor is on. 0 indexed.
         cursor_pos
             Position of the cursor in the current line/line_buffer/text. 0
             indexed.
         line_buffer : optional, str
             The current line the cursor is in, this is mostly due to legacy
             reason that readline could only give a us the single current line.
             Prefer `full_text`.
         text : str
             The current "token" the cursor is in, mostly also for historical
             reasons. as the completer would trigger only after the current line
             was parsed.
         full_text : str
             Full text of the current cell.
 
         Returns
         -------
         An ordered dictionary where keys are identifiers of completion
         matchers and values are ``MatcherResult``s.
         """
 
         # if the cursor position isn't given, the only sane assumption we can
         # make is that it's at the end of the line (the common case)
         if cursor_pos is None:
             cursor_pos = len(line_buffer) if text is None else len(text)
 
         if self.use_main_ns:
             self.namespace = __main__.__dict__
 
         # if text is either None or an empty string, rely on the line buffer
         if (not line_buffer) and full_text:
             line_buffer = full_text.split('\n')[cursor_line]
         if not text:  # issue #11508: check line_buffer before calling split_line
             text = (
                 self.splitter.split_line(line_buffer, cursor_pos) if line_buffer else ""
             )
 
         # If no line buffer is given, assume the input text is all there was
         if line_buffer is None:
             line_buffer = text
 
         # deprecated - do not use `line_buffer` in new code.
         self.line_buffer = line_buffer
         self.text_until_cursor = self.line_buffer[:cursor_pos]
 
         if not full_text:
             full_text = line_buffer
 
         context = CompletionContext(
             full_text=full_text,
             cursor_position=cursor_pos,
             cursor_line=cursor_line,
             token=text,
             limit=MATCHES_LIMIT,
         )
 
         # Start with a clean slate of completions
         results = {}
 
         jedi_matcher_id = _get_matcher_id(self._jedi_matcher)
 
         suppressed_matchers = set()
 
         matchers = {
             _get_matcher_id(matcher): matcher
             for matcher in sorted(
                 self.matchers, key=_get_matcher_priority, reverse=True
             )
         }
 
         for matcher_id, matcher in matchers.items():
             api_version = _get_matcher_api_version(matcher)
             matcher_id = _get_matcher_id(matcher)
 
             if matcher_id in self.disable_matchers:
                 continue
 
             if matcher_id in results:
                 warnings.warn(f"Duplicate matcher ID: {matcher_id}.")
 
             if matcher_id in suppressed_matchers:
                 continue
 
             try:
                 if api_version == 1:
                     result = _convert_matcher_v1_result_to_v2(
                         matcher(text), type=_UNKNOWN_TYPE
                     )
                 elif api_version == 2:
                     result = cast(matcher, MatcherAPIv2)(context)
                 else:
                     raise ValueError(f"Unsupported API version {api_version}")
             except:
                 # Show the ugly traceback if the matcher causes an
                 # exception, but do NOT crash the kernel!
                 sys.excepthook(*sys.exc_info())
                 continue
 
             # set default value for matched fragment if suffix was not selected.
             result["matched_fragment"] = result.get("matched_fragment", context.token)
 
             if not suppressed_matchers:
                 suppression_recommended = result.get("suppress", False)
 
                 suppression_config = (
                     self.suppress_competing_matchers.get(matcher_id, None)
                     if isinstance(self.suppress_competing_matchers, dict)
                     else self.suppress_competing_matchers
                 )
                 should_suppress = (
                     (suppression_config is True)
                     or (suppression_recommended and (suppression_config is not False))
                 ) and len(result["completions"])
 
                 if should_suppress:
                     suppression_exceptions = result.get("do_not_suppress", set())
                     try:
                         to_suppress = set(suppression_recommended)
                     except TypeError:
                         to_suppress = set(matchers)
                     suppressed_matchers = to_suppress - suppression_exceptions
 
                     new_results = {}
                     for previous_matcher_id, previous_result in results.items():
                         if previous_matcher_id not in suppressed_matchers:
                             new_results[previous_matcher_id] = previous_result
                     results = new_results
 
             results[matcher_id] = result
 
         _, matches = self._arrange_and_extract(
             results,
             # TODO Jedi completions non included in legacy stateful API; was this deliberate or omission?
             #  if it was omission, we can remove the filtering step, otherwise remove this comment.
             skip_matchers={jedi_matcher_id},
             abort_if_offset_changes=False,
         )
 
         # populate legacy stateful API
         self.matches = matches
 
         return results
 
     @staticmethod
     def _deduplicate(
         matches: Sequence[SimpleCompletion],
     ) -> Iterable[SimpleCompletion]:
         filtered_matches = {}
         for match in matches:
             text = match.text
             if (
                 text not in filtered_matches
                 or filtered_matches[text].type == _UNKNOWN_TYPE
             ):
                 filtered_matches[text] = match
 
         return filtered_matches.values()
 
     @staticmethod
     def _sort(matches: Sequence[SimpleCompletion]):
         return sorted(matches, key=lambda x: completions_sorting_key(x.text))
 
     @context_matcher()
     def fwd_unicode_matcher(self, context):
         """Same as ``fwd_unicode_match``, but adopted to new Matcher API."""
         fragment, matches = self.latex_matches(context.token)
         return _convert_matcher_v1_result_to_v2(
             matches, type="unicode", fragment=fragment, suppress_if_matches=True
         )
 
     def fwd_unicode_match(self, text: str) -> Tuple[str, Sequence[str]]:
         """
         Forward match a string starting with a backslash with a list of
         potential Unicode completions.
 
         Will compute list list of Unicode character names on first call and cache it.
 
         Returns
         -------
         At tuple with:
             - matched text (empty if no matches)
             - list of potential completions, empty tuple  otherwise)
 
         DEPRECATED: Deprecated since 8.6. Use `fwd_unicode_matcher` instead.
         """
         # TODO: self.unicode_names is here a list we traverse each time with ~100k elements.
         # We could do a faster match using a Trie.
 
         # Using pygtrie the following seem to work:
 
         #     s = PrefixSet()
 
         #     for c in range(0,0x10FFFF + 1):
         #         try:
         #             s.add(unicodedata.name(chr(c)))
         #         except ValueError:
         #             pass
         #     [''.join(k) for k in s.iter(prefix)]
 
         # But need to be timed and adds an extra dependency.
 
         slashpos = text.rfind('\\')
         # if text starts with slash
         if slashpos > -1:
             # PERF: It's important that we don't access self._unicode_names
             # until we're inside this if-block. _unicode_names is lazily
             # initialized, and it takes a user-noticeable amount of time to
             # initialize it, so we don't want to initialize it unless we're
             # actually going to use it.
             s = text[slashpos + 1 :]
             sup = s.upper()
             candidates = [x for x in self.unicode_names if x.startswith(sup)]
             if candidates:
                 return s, candidates
             candidates = [x for x in self.unicode_names if sup in x]
             if candidates:
                 return s, candidates
             splitsup = sup.split(" ")
             candidates = [
                 x for x in self.unicode_names if all(u in x for u in splitsup)
             ]
             if candidates:
                 return s, candidates
 
             return "", ()
 
         # if text does not start with slash
         else:
             return '', ()
 
     @property
     def unicode_names(self) -> List[str]:
         """List of names of unicode code points that can be completed.
 
         The list is lazily initialized on first access.
         """
         if self._unicode_names is None:
             names = []
             for c in range(0,0x10FFFF + 1):
                 try:
                     names.append(unicodedata.name(chr(c)))
                 except ValueError:
                     pass
             self._unicode_names = _unicode_name_compute(_UNICODE_RANGES)
 
         return self._unicode_names
 
 def _unicode_name_compute(ranges:List[Tuple[int,int]]) -> List[str]:
     names = []
     for start,stop in ranges:
         for c in range(start, stop) :
             try:
                 names.append(unicodedata.name(chr(c)))
             except ValueError:
                 pass
     return names

IPython/core/history.py

@@ -1,938 +1,965 b''
 """ History related magics and functionality """
 
 # Copyright (c) IPython Development Team.
 # Distributed under the terms of the Modified BSD License.
 
 
 import atexit
 import datetime
 from pathlib import Path
 import re
 import sqlite3
 import threading
 
 from traitlets.config.configurable import LoggingConfigurable
 from decorator import decorator
 from IPython.utils.decorators import undoc
 from IPython.paths import locate_profile
 from traitlets import (
     Any,
     Bool,
     Dict,
     Instance,
     Integer,
     List,
     Unicode,
     Union,
     TraitError,
     default,
     observe,
 )
 
 #-----------------------------------------------------------------------------
 # Classes and functions
 #-----------------------------------------------------------------------------
 
 @undoc
 class DummyDB(object):
     """Dummy DB that will act as a black hole for history.
 
     Only used in the absence of sqlite"""
     def execute(*args, **kwargs):
         return []
 
     def commit(self, *args, **kwargs):
         pass
 
     def __enter__(self, *args, **kwargs):
         pass
 
     def __exit__(self, *args, **kwargs):
         pass
 
 
 @decorator
 def only_when_enabled(f, self, *a, **kw):
     """Decorator: return an empty list in the absence of sqlite."""
     if not self.enabled:
         return []
     else:
         return f(self, *a, **kw)
 
 
 # use 16kB as threshold for whether a corrupt history db should be saved
 # that should be at least 100 entries or so
 _SAVE_DB_SIZE = 16384
 
 @decorator
 def catch_corrupt_db(f, self, *a, **kw):
     """A decorator which wraps HistoryAccessor method calls to catch errors from
     a corrupt SQLite database, move the old database out of the way, and create
     a new one.
 
     We avoid clobbering larger databases because this may be triggered due to filesystem issues,
     not just a corrupt file.
     """
     try:
         return f(self, *a, **kw)
     except (sqlite3.DatabaseError, sqlite3.OperationalError) as e:
         self._corrupt_db_counter += 1
         self.log.error("Failed to open SQLite history %s (%s).", self.hist_file, e)
         if self.hist_file != ':memory:':
             if self._corrupt_db_counter > self._corrupt_db_limit:
                 self.hist_file = ':memory:'
                 self.log.error("Failed to load history too many times, history will not be saved.")
             elif self.hist_file.is_file():
                 # move the file out of the way
                 base = str(self.hist_file.parent / self.hist_file.stem)
                 ext = self.hist_file.suffix
                 size = self.hist_file.stat().st_size
                 if size >= _SAVE_DB_SIZE:
                     # if there's significant content, avoid clobbering
                     now = datetime.datetime.now().isoformat().replace(':', '.')
                     newpath = base + '-corrupt-' + now + ext
                     # don't clobber previous corrupt backups
                     for i in range(100):
                         if not Path(newpath).exists():
                             break
                         else:
                             newpath = base + '-corrupt-' + now + (u'-%i' % i) + ext
                 else:
                     # not much content, possibly empty; don't worry about clobbering
                     # maybe we should just delete it?
                     newpath = base + '-corrupt' + ext
                 self.hist_file.rename(newpath)
                 self.log.error("History file was moved to %s and a new file created.", newpath)
             self.init_db()
             return []
         else:
             # Failed with :memory:, something serious is wrong
             raise
 
 
 class HistoryAccessorBase(LoggingConfigurable):
     """An abstract class for History Accessors """
 
     def get_tail(self, n=10, raw=True, output=False, include_latest=False):
         raise NotImplementedError
 
     def search(self, pattern="*", raw=True, search_raw=True,
                output=False, n=None, unique=False):
         raise NotImplementedError
 
     def get_range(self, session, start=1, stop=None, raw=True,output=False):
         raise NotImplementedError
 
     def get_range_by_str(self, rangestr, raw=True, output=False):
         raise NotImplementedError
 
 
 class HistoryAccessor(HistoryAccessorBase):
     """Access the history database without adding to it.
 
     This is intended for use by standalone history tools. IPython shells use
     HistoryManager, below, which is a subclass of this."""
 
     # counter for init_db retries, so we don't keep trying over and over
     _corrupt_db_counter = 0
      # after two failures, fallback on :memory:
     _corrupt_db_limit = 2
 
     # String holding the path to the history file
     hist_file = Union(
         [Instance(Path), Unicode()],
         help="""Path to file to use for SQLite history database.
 
         By default, IPython will put the history database in the IPython
         profile directory.  If you would rather share one history among
         profiles, you can set this value in each, so that they are consistent.
 
         Due to an issue with fcntl, SQLite is known to misbehave on some NFS
         mounts.  If you see IPython hanging, try setting this to something on a
         local disk, e.g::
 
             ipython --HistoryManager.hist_file=/tmp/ipython_hist.sqlite
 
         you can also use the specific value `:memory:` (including the colon
         at both end but not the back ticks), to avoid creating an history file.
 
         """,
     ).tag(config=True)
 
     enabled = Bool(True,
         help="""enable the SQLite history
 
         set enabled=False to disable the SQLite history,
         in which case there will be no stored history, no SQLite connection,
         and no background saving thread.  This may be necessary in some
         threaded environments where IPython is embedded.
         """,
     ).tag(config=True)
 
     connection_options = Dict(
         help="""Options for configuring the SQLite connection
 
         These options are passed as keyword args to sqlite3.connect
         when establishing database connections.
         """
     ).tag(config=True)
 
     # The SQLite database
     db = Any()
     @observe('db')
     def _db_changed(self, change):
         """validate the db, since it can be an Instance of two different types"""
         new = change['new']
         connection_types = (DummyDB, sqlite3.Connection)
         if not isinstance(new, connection_types):
             msg = "%s.db must be sqlite3 Connection or DummyDB, not %r" % \
                     (self.__class__.__name__, new)
             raise TraitError(msg)
 
     def __init__(self, profile="default", hist_file="", **traits):
         """Create a new history accessor.
 
         Parameters
         ----------
         profile : str
             The name of the profile from which to open history.
         hist_file : str
             Path to an SQLite history database stored by IPython. If specified,
             hist_file overrides profile.
         config : :class:`~traitlets.config.loader.Config`
             Config object. hist_file can also be set through this.
         """
-        # We need a pointer back to the shell for various tasks.
         super(HistoryAccessor, self).__init__(**traits)
         # defer setting hist_file from kwarg until after init,
         # otherwise the default kwarg value would clobber any value
         # set by config
         if hist_file:
             self.hist_file = hist_file
 
         try:
             self.hist_file
         except TraitError:
             # No one has set the hist_file, yet.
             self.hist_file = self._get_hist_file_name(profile)
 
         self.init_db()
 
     def _get_hist_file_name(self, profile='default'):
         """Find the history file for the given profile name.
 
         This is overridden by the HistoryManager subclass, to use the shell's
         active profile.
 
         Parameters
         ----------
         profile : str
             The name of a profile which has a history file.
         """
         return Path(locate_profile(profile)) / "history.sqlite"
 
     @catch_corrupt_db
     def init_db(self):
         """Connect to the database, and create tables if necessary."""
         if not self.enabled:
             self.db = DummyDB()
             return
 
         # use detect_types so that timestamps return datetime objects
         kwargs = dict(detect_types=sqlite3.PARSE_DECLTYPES|sqlite3.PARSE_COLNAMES)
         kwargs.update(self.connection_options)
         self.db = sqlite3.connect(str(self.hist_file), **kwargs)
         with self.db:
             self.db.execute(
                 """CREATE TABLE IF NOT EXISTS sessions (session integer
                             primary key autoincrement, start timestamp,
                             end timestamp, num_cmds integer, remark text)"""
             )
             self.db.execute(
                 """CREATE TABLE IF NOT EXISTS history
                     (session integer, line integer, source text, source_raw text,
                     PRIMARY KEY (session, line))"""
             )
             # Output history is optional, but ensure the table's there so it can be
             # enabled later.
             self.db.execute(
                 """CREATE TABLE IF NOT EXISTS output_history
                             (session integer, line integer, output text,
                             PRIMARY KEY (session, line))"""
             )
         # success! reset corrupt db count
         self._corrupt_db_counter = 0
 
     def writeout_cache(self):
         """Overridden by HistoryManager to dump the cache before certain
         database lookups."""
         pass
 
     ## -------------------------------
     ## Methods for retrieving history:
     ## -------------------------------
     def _run_sql(self, sql, params, raw=True, output=False, latest=False):
         """Prepares and runs an SQL query for the history database.
 
         Parameters
         ----------
         sql : str
             Any filtering expressions to go after SELECT ... FROM ...
         params : tuple
             Parameters passed to the SQL query (to replace "?")
         raw, output : bool
             See :meth:`get_range`
         latest : bool
             Select rows with max (session, line)
 
         Returns
         -------
         Tuples as :meth:`get_range`
         """
         toget = 'source_raw' if raw else 'source'
         sqlfrom = "history"
         if output:
             sqlfrom = "history LEFT JOIN output_history USING (session, line)"
             toget = "history.%s, output_history.output" % toget
         if latest:
             toget += ", MAX(session * 128 * 1024 + line)"
         this_querry = "SELECT session, line, %s FROM %s " % (toget, sqlfrom) + sql
         cur = self.db.execute(this_querry, params)
         if latest:
             cur = (row[:-1] for row in cur)
         if output:    # Regroup into 3-tuples, and parse JSON
             return ((ses, lin, (inp, out)) for ses, lin, inp, out in cur)
         return cur
 
     @only_when_enabled
     @catch_corrupt_db
     def get_session_info(self, session):
         """Get info about a session.
 
         Parameters
         ----------
         session : int
             Session number to retrieve.
 
         Returns
         -------
         session_id : int
             Session ID number
         start : datetime
             Timestamp for the start of the session.
         end : datetime
             Timestamp for the end of the session, or None if IPython crashed.
         num_cmds : int
             Number of commands run, or None if IPython crashed.
         remark : unicode
             A manually set description.
         """
         query = "SELECT * from sessions where session == ?"
         return self.db.execute(query, (session,)).fetchone()
 
     @catch_corrupt_db
     def get_last_session_id(self):
         """Get the last session ID currently in the database.
 
         Within IPython, this should be the same as the value stored in
         :attr:`HistoryManager.session_number`.
         """
         for record in self.get_tail(n=1, include_latest=True):
             return record[0]
 
     @catch_corrupt_db
     def get_tail(self, n=10, raw=True, output=False, include_latest=False):
         """Get the last n lines from the history database.
 
-        Most recent entry last.
-
-        Completion will be reordered so that that the last ones are when
-        possible from current session.
-
         Parameters
         ----------
         n : int
             The number of lines to get
         raw, output : bool
             See :meth:`get_range`
         include_latest : bool
             If False (default), n+1 lines are fetched, and the latest one
             is discarded. This is intended to be used where the function
             is called by a user command, which it should not return.
 
         Returns
         -------
         Tuples as :meth:`get_range`
         """
         self.writeout_cache()
         if not include_latest:
             n += 1
-        # cursor/line/entry
-        this_cur = list(
-            self._run_sql(
-                "WHERE session == ? ORDER BY line DESC LIMIT ?  ",
-                (self.session_number, n),
-                raw=raw,
-                output=output,
-            )
-        )
-        other_cur = list(
-            self._run_sql(
-                "WHERE session != ? ORDER BY session DESC, line DESC LIMIT ?",
-                (self.session_number, n),
-                raw=raw,
-                output=output,
-            )
+        cur = self._run_sql(
+            "ORDER BY session DESC, line DESC LIMIT ?", (n,), raw=raw, output=output
         )
-
-        everything = this_cur + other_cur
-
-        everything = everything[:n]
-
         if not include_latest:
-            return list(everything)[:0:-1]
-        return list(everything)[::-1]
+            return reversed(list(cur)[1:])
+        return reversed(list(cur))
 
     @catch_corrupt_db
     def search(self, pattern="*", raw=True, search_raw=True,
                output=False, n=None, unique=False):
         """Search the database using unix glob-style matching (wildcards
         * and ?).
 
         Parameters
         ----------
         pattern : str
             The wildcarded pattern to match when searching
         search_raw : bool
             If True, search the raw input, otherwise, the parsed input
         raw, output : bool
             See :meth:`get_range`
         n : None or int
             If an integer is given, it defines the limit of
             returned entries.
         unique : bool
             When it is true, return only unique entries.
 
         Returns
         -------
         Tuples as :meth:`get_range`
         """
         tosearch = "source_raw" if search_raw else "source"
         if output:
             tosearch = "history." + tosearch
         self.writeout_cache()
         sqlform = "WHERE %s GLOB ?" % tosearch
         params = (pattern,)
         if unique:
             sqlform += ' GROUP BY {0}'.format(tosearch)
         if n is not None:
             sqlform += " ORDER BY session DESC, line DESC LIMIT ?"
             params += (n,)
         elif unique:
             sqlform += " ORDER BY session, line"
         cur = self._run_sql(sqlform, params, raw=raw, output=output, latest=unique)
         if n is not None:
             return reversed(list(cur))
         return cur
 
     @catch_corrupt_db
     def get_range(self, session, start=1, stop=None, raw=True,output=False):
         """Retrieve input by session.
 
         Parameters
         ----------
         session : int
             Session number to retrieve.
         start : int
             First line to retrieve.
         stop : int
             End of line range (excluded from output itself). If None, retrieve
             to the end of the session.
         raw : bool
             If True, return untranslated input
         output : bool
             If True, attempt to include output. This will be 'real' Python
             objects for the current session, or text reprs from previous
             sessions if db_log_output was enabled at the time. Where no output
             is found, None is used.
 
         Returns
         -------
         entries
             An iterator over the desired lines. Each line is a 3-tuple, either
             (session, line, input) if output is False, or
             (session, line, (input, output)) if output is True.
         """
         if stop:
             lineclause = "line >= ? AND line < ?"
             params = (session, start, stop)
         else:
             lineclause = "line>=?"
             params = (session, start)
 
         return self._run_sql("WHERE session==? AND %s" % lineclause,
                                     params, raw=raw, output=output)
 
     def get_range_by_str(self, rangestr, raw=True, output=False):
         """Get lines of history from a string of ranges, as used by magic
         commands %hist, %save, %macro, etc.
 
         Parameters
         ----------
         rangestr : str
             A string specifying ranges, e.g. "5 ~2/1-4". If empty string is used,
             this will return everything from current session's history.
 
             See the documentation of :func:`%history` for the full details.
 
         raw, output : bool
             As :meth:`get_range`
 
         Returns
         -------
         Tuples as :meth:`get_range`
         """
         for sess, s, e in extract_hist_ranges(rangestr):
             for line in self.get_range(sess, s, e, raw=raw, output=output):
                 yield line
 
 
 class HistoryManager(HistoryAccessor):
     """A class to organize all history-related functionality in one place.
     """
     # Public interface
 
     # An instance of the IPython shell we are attached to
     shell = Instance('IPython.core.interactiveshell.InteractiveShellABC',
                      allow_none=True)
     # Lists to hold processed and raw history. These start with a blank entry
     # so that we can index them starting from 1
     input_hist_parsed = List([""])
     input_hist_raw = List([""])
     # A list of directories visited during session
     dir_hist = List()
     @default('dir_hist')
     def _dir_hist_default(self):
         try:
             return [Path.cwd()]
         except OSError:
             return []
 
     # A dict of output history, keyed with ints from the shell's
     # execution count.
     output_hist = Dict()
     # The text/plain repr of outputs.
     output_hist_reprs = Dict()
 
     # The number of the current session in the history database
     session_number = Integer()
 
     db_log_output = Bool(False,
         help="Should the history database include output? (default: no)"
     ).tag(config=True)
     db_cache_size = Integer(0,
         help="Write to database every x commands (higher values save disk access & power).\n"
         "Values of 1 or less effectively disable caching."
     ).tag(config=True)
     # The input and output caches
     db_input_cache = List()
     db_output_cache = List()
 
     # History saving in separate thread
     save_thread = Instance('IPython.core.history.HistorySavingThread',
                            allow_none=True)
     save_flag = Instance(threading.Event, allow_none=True)
 
     # Private interface
     # Variables used to store the three last inputs from the user.  On each new
     # history update, we populate the user's namespace with these, shifted as
     # necessary.
     _i00 = Unicode(u'')
     _i = Unicode(u'')
     _ii = Unicode(u'')
     _iii = Unicode(u'')
 
     # A regex matching all forms of the exit command, so that we don't store
     # them in the history (it's annoying to rewind the first entry and land on
     # an exit call).
     _exit_re = re.compile(r"(exit|quit)(\s*\(.*\))?$")
 
     def __init__(self, shell=None, config=None, **traits):
         """Create a new history manager associated with a shell instance.
         """
-        # We need a pointer back to the shell for various tasks.
         super(HistoryManager, self).__init__(shell=shell, config=config,
             **traits)
         self.save_flag = threading.Event()
         self.db_input_cache_lock = threading.Lock()
         self.db_output_cache_lock = threading.Lock()
 
         try:
             self.new_session()
         except sqlite3.OperationalError:
             self.log.error("Failed to create history session in %s. History will not be saved.",
                 self.hist_file, exc_info=True)
             self.hist_file = ':memory:'
 
         if self.enabled and self.hist_file != ':memory:':
             self.save_thread = HistorySavingThread(self)
             self.save_thread.start()
 
     def _get_hist_file_name(self, profile=None):
         """Get default history file name based on the Shell's profile.
 
         The profile parameter is ignored, but must exist for compatibility with
         the parent class."""
         profile_dir = self.shell.profile_dir.location
         return Path(profile_dir) / "history.sqlite"
 
     @only_when_enabled
     def new_session(self, conn=None):
         """Get a new session number."""
         if conn is None:
             conn = self.db
 
         with conn:
             cur = conn.execute("""INSERT INTO sessions VALUES (NULL, ?, NULL,
                             NULL, "") """, (datetime.datetime.now(),))
             self.session_number = cur.lastrowid
 
     def end_session(self):
         """Close the database session, filling in the end time and line count."""
         self.writeout_cache()
         with self.db:
             self.db.execute("""UPDATE sessions SET end=?, num_cmds=? WHERE
                             session==?""", (datetime.datetime.now(),
                             len(self.input_hist_parsed)-1, self.session_number))
         self.session_number = 0
 
     def name_session(self, name):
         """Give the current session a name in the history database."""
         with self.db:
             self.db.execute("UPDATE sessions SET remark=? WHERE session==?",
                             (name, self.session_number))
 
     def reset(self, new_session=True):
         """Clear the session history, releasing all object references, and
         optionally open a new session."""
         self.output_hist.clear()
         # The directory history can't be completely empty
         self.dir_hist[:] = [Path.cwd()]
 
         if new_session:
             if self.session_number:
                 self.end_session()
             self.input_hist_parsed[:] = [""]
             self.input_hist_raw[:] = [""]
             self.new_session()
 
     # ------------------------------
     # Methods for retrieving history
     # ------------------------------
     def get_session_info(self, session=0):
         """Get info about a session.
 
         Parameters
         ----------
         session : int
             Session number to retrieve. The current session is 0, and negative
             numbers count back from current session, so -1 is the previous session.
 
         Returns
         -------
         session_id : int
             Session ID number
         start : datetime
             Timestamp for the start of the session.
         end : datetime
             Timestamp for the end of the session, or None if IPython crashed.
         num_cmds : int
             Number of commands run, or None if IPython crashed.
         remark : unicode
             A manually set description.
         """
         if session <= 0:
             session += self.session_number
 
         return super(HistoryManager, self).get_session_info(session=session)
 
+    @catch_corrupt_db
+    def get_tail(self, n=10, raw=True, output=False, include_latest=False):
+        """Get the last n lines from the history database.
+
+        Most recent entry last.
+
+        Completion will be reordered so that that the last ones are when
+        possible from current session.
+
+        Parameters
+        ----------
+        n : int
+            The number of lines to get
+        raw, output : bool
+            See :meth:`get_range`
+        include_latest : bool
+            If False (default), n+1 lines are fetched, and the latest one
+            is discarded. This is intended to be used where the function
+            is called by a user command, which it should not return.
+
+        Returns
+        -------
+        Tuples as :meth:`get_range`
+        """
+        self.writeout_cache()
+        if not include_latest:
+            n += 1
+        # cursor/line/entry
+        this_cur = list(
+            self._run_sql(
+                "WHERE session == ? ORDER BY line DESC LIMIT ?  ",
+                (self.session_number, n),
+                raw=raw,
+                output=output,
+            )
+        )
+        other_cur = list(
+            self._run_sql(
+                "WHERE session != ? ORDER BY session DESC, line DESC LIMIT ?",
+                (self.session_number, n),
+                raw=raw,
+                output=output,
+            )
+        )
+
+        everything = this_cur + other_cur
+
+        everything = everything[:n]
+
+        if not include_latest:
+            return list(everything)[:0:-1]
+        return list(everything)[::-1]
+
     def _get_range_session(self, start=1, stop=None, raw=True, output=False):
         """Get input and output history from the current session. Called by
         get_range, and takes similar parameters."""
         input_hist = self.input_hist_raw if raw else self.input_hist_parsed
 
         n = len(input_hist)
         if start < 0:
             start += n
         if not stop or (stop > n):
             stop = n
         elif stop < 0:
             stop += n
 
         for i in range(start, stop):
             if output:
                 line = (input_hist[i], self.output_hist_reprs.get(i))
             else:
                 line = input_hist[i]
             yield (0, i, line)
 
     def get_range(self, session=0, start=1, stop=None, raw=True,output=False):
         """Retrieve input by session.
 
         Parameters
         ----------
         session : int
             Session number to retrieve. The current session is 0, and negative
             numbers count back from current session, so -1 is previous session.
         start : int
             First line to retrieve.
         stop : int
             End of line range (excluded from output itself). If None, retrieve
             to the end of the session.
         raw : bool
             If True, return untranslated input
         output : bool
             If True, attempt to include output. This will be 'real' Python
             objects for the current session, or text reprs from previous
             sessions if db_log_output was enabled at the time. Where no output
             is found, None is used.
 
         Returns
         -------
         entries
             An iterator over the desired lines. Each line is a 3-tuple, either
             (session, line, input) if output is False, or
             (session, line, (input, output)) if output is True.
         """
         if session <= 0:
             session += self.session_number
         if session==self.session_number:          # Current session
             return self._get_range_session(start, stop, raw, output)
         return super(HistoryManager, self).get_range(session, start, stop, raw,
                                                      output)
 
     ## ----------------------------
     ## Methods for storing history:
     ## ----------------------------
     def store_inputs(self, line_num, source, source_raw=None):
         """Store source and raw input in history and create input cache
         variables ``_i*``.
 
         Parameters
         ----------
         line_num : int
             The prompt number of this input.
         source : str
             Python input.
         source_raw : str, optional
             If given, this is the raw input without any IPython transformations
             applied to it.  If not given, ``source`` is used.
         """
         if source_raw is None:
             source_raw = source
         source = source.rstrip('\n')
         source_raw = source_raw.rstrip('\n')
 
         # do not store exit/quit commands
         if self._exit_re.match(source_raw.strip()):
             return
 
         self.input_hist_parsed.append(source)
         self.input_hist_raw.append(source_raw)
 
         with self.db_input_cache_lock:
             self.db_input_cache.append((line_num, source, source_raw))
             # Trigger to flush cache and write to DB.
             if len(self.db_input_cache) >= self.db_cache_size:
                 self.save_flag.set()
 
         # update the auto _i variables
         self._iii = self._ii
         self._ii = self._i
         self._i = self._i00
         self._i00 = source_raw
 
         # hackish access to user namespace to create _i1,_i2... dynamically
         new_i = '_i%s' % line_num
         to_main = {'_i': self._i,
                    '_ii': self._ii,
                    '_iii': self._iii,
                    new_i : self._i00 }
 
         if self.shell is not None:
             self.shell.push(to_main, interactive=False)
 
     def store_output(self, line_num):
         """If database output logging is enabled, this saves all the
         outputs from the indicated prompt number to the database. It's
         called by run_cell after code has been executed.
 
         Parameters
         ----------
         line_num : int
             The line number from which to save outputs
         """
         if (not self.db_log_output) or (line_num not in self.output_hist_reprs):
             return
         output = self.output_hist_reprs[line_num]
 
         with self.db_output_cache_lock:
             self.db_output_cache.append((line_num, output))
         if self.db_cache_size <= 1:
             self.save_flag.set()
 
     def _writeout_input_cache(self, conn):
         with conn:
             for line in self.db_input_cache:
                 conn.execute("INSERT INTO history VALUES (?, ?, ?, ?)",
                                 (self.session_number,)+line)
 
     def _writeout_output_cache(self, conn):
         with conn:
             for line in self.db_output_cache:
                 conn.execute("INSERT INTO output_history VALUES (?, ?, ?)",
                                 (self.session_number,)+line)
 
     @only_when_enabled
     def writeout_cache(self, conn=None):
         """Write any entries in the cache to the database."""
         if conn is None:
             conn = self.db
 
         with self.db_input_cache_lock:
             try:
                 self._writeout_input_cache(conn)
             except sqlite3.IntegrityError:
                 self.new_session(conn)
                 print("ERROR! Session/line number was not unique in",
                       "database. History logging moved to new session",
                                                 self.session_number)
                 try:
                     # Try writing to the new session. If this fails, don't
                     # recurse
                     self._writeout_input_cache(conn)
                 except sqlite3.IntegrityError:
                     pass
             finally:
                 self.db_input_cache = []
 
         with self.db_output_cache_lock:
             try:
                 self._writeout_output_cache(conn)
             except sqlite3.IntegrityError:
                 print("!! Session/line number for output was not unique",
                       "in database. Output will not be stored.")
             finally:
                 self.db_output_cache = []
 
 
 class HistorySavingThread(threading.Thread):
     """This thread takes care of writing history to the database, so that
     the UI isn't held up while that happens.
 
     It waits for the HistoryManager's save_flag to be set, then writes out
     the history cache. The main thread is responsible for setting the flag when
     the cache size reaches a defined threshold."""
     daemon = True
     stop_now = False
     enabled = True
     def __init__(self, history_manager):
         super(HistorySavingThread, self).__init__(name="IPythonHistorySavingThread")
         self.history_manager = history_manager
         self.enabled = history_manager.enabled
         atexit.register(self.stop)
 
     @only_when_enabled
     def run(self):
         # We need a separate db connection per thread:
         try:
             self.db = sqlite3.connect(
                 str(self.history_manager.hist_file),
                 **self.history_manager.connection_options,
             )
             while True:
                 self.history_manager.save_flag.wait()
                 if self.stop_now:
                     self.db.close()
                     return
                 self.history_manager.save_flag.clear()
                 self.history_manager.writeout_cache(self.db)
         except Exception as e:
             print(("The history saving thread hit an unexpected error (%s)."
                    "History will not be written to the database.") % repr(e))
 
     def stop(self):
         """This can be called from the main thread to safely stop this thread.
 
         Note that it does not attempt to write out remaining history before
         exiting. That should be done by calling the HistoryManager's
         end_session method."""
         self.stop_now = True
         self.history_manager.save_flag.set()
         self.join()
 
 
 # To match, e.g. ~5/8-~2/3
 range_re = re.compile(r"""
 ((?P<startsess>~?\d+)/)?
 (?P<start>\d+)?
 ((?P<sep>[\-:])
  ((?P<endsess>~?\d+)/)?
  (?P<end>\d+))?
 $""", re.VERBOSE)
 
 
 def extract_hist_ranges(ranges_str):
     """Turn a string of history ranges into 3-tuples of (session, start, stop).
 
     Empty string results in a `[(0, 1, None)]`, i.e. "everything from current
     session".
 
     Examples
     --------
     >>> list(extract_hist_ranges("~8/5-~7/4 2"))
     [(-8, 5, None), (-7, 1, 5), (0, 2, 3)]
     """
     if ranges_str == "":
         yield (0, 1, None)  # Everything from current session
         return
 
     for range_str in ranges_str.split():
         rmatch = range_re.match(range_str)
         if not rmatch:
             continue
         start = rmatch.group("start")
         if start:
             start = int(start)
             end = rmatch.group("end")
             # If no end specified, get (a, a + 1)
             end = int(end) if end else start + 1
         else:  # start not specified
             if not rmatch.group('startsess'):  # no startsess
                 continue
             start = 1
             end = None  # provide the entire session hist
 
         if rmatch.group("sep") == "-":       # 1-3 == 1:4 --> [1, 2, 3]
             end += 1
         startsess = rmatch.group("startsess") or "0"
         endsess = rmatch.group("endsess") or startsess
         startsess = int(startsess.replace("~","-"))
         endsess = int(endsess.replace("~","-"))
         assert endsess >= startsess, "start session must be earlier than end session"
 
         if endsess == startsess:
             yield (startsess, start, end)
             continue
         # Multiple sessions in one range:
         yield (startsess, start, None)
         for sess in range(startsess+1, endsess):
             yield (sess, 1, None)
         yield (endsess, 1, end)
 
 
 def _format_lineno(session, line):
     """Helper function to format line numbers properly."""
     if session == 0:
         return str(line)
     return "%s#%s" % (session, line)

IPython/core/hooks.py

@@ -1,171 +1,173 b''
 """Hooks for IPython.
 
 In Python, it is possible to overwrite any method of any object if you really
 want to.  But IPython exposes a few 'hooks', methods which are *designed* to
 be overwritten by users for customization purposes.  This module defines the
 default versions of all such hooks, which get used by IPython if not
 overridden by the user.
 
 Hooks are simple functions, but they should be declared with ``self`` as their
 first argument, because when activated they are registered into IPython as
 instance methods. The self argument will be the IPython running instance
 itself, so hooks have full access to the entire IPython object.
 
 If you wish to define a new hook and activate it, you can make an :doc:`extension
 </config/extensions/index>` or a :ref:`startup script <startup_files>`. For
 example, you could use a startup file like this::
 
     import os
 
     def calljed(self,filename, linenum):
         "My editor hook calls the jed editor directly."
         print "Calling my own editor, jed ..."
         if os.system('jed +%d %s' % (linenum,filename)) != 0:
             raise TryNext()
 
     def load_ipython_extension(ip):
         ip.set_hook('editor', calljed)
 
 """
 
 #*****************************************************************************
 #       Copyright (C) 2005 Fernando Perez. <[e-mail]>
 #
 #  Distributed under the terms of the BSD License.  The full license is in
 #  the file COPYING, distributed as part of this software.
 #*****************************************************************************
 
 import os
 import subprocess
 import sys
 
 from .error import TryNext
 
 # List here all the default hooks.  For now it's just the editor functions
 # but over time we'll move here all the public API for user-accessible things.
 
 __all__ = [
     "editor",
     "synchronize_with_editor",
     "show_in_pager",
     "pre_prompt_hook",
     "clipboard_get",
 ]
 
 deprecated = {'pre_run_code_hook': "a callback for the 'pre_execute' or 'pre_run_cell' event",
               'late_startup_hook': "a callback for the 'shell_initialized' event",
               'shutdown_hook': "the atexit module",
              }
 
 def editor(self, filename, linenum=None, wait=True):
     """Open the default editor at the given filename and linenumber.
 
     This is IPython's default editor hook, you can use it as an example to
     write your own modified one.  To set your own editor function as the
     new editor hook, call ip.set_hook('editor',yourfunc)."""
 
     # IPython configures a default editor at startup by reading $EDITOR from
     # the environment, and falling back on vi (unix) or notepad (win32).
     editor = self.editor
 
     # marker for at which line to open the file (for existing objects)
     if linenum is None or editor=='notepad':
         linemark = ''
     else:
         linemark = '+%d' % int(linenum)
 
     # Enclose in quotes if necessary and legal
     if ' ' in editor and os.path.isfile(editor) and editor[0] != '"':
         editor = '"%s"' % editor
 
     # Call the actual editor
     proc = subprocess.Popen('%s %s %s' % (editor, linemark, filename),
                             shell=True)
     if wait and proc.wait() != 0:
         raise TryNext()
 
 
 def synchronize_with_editor(self, filename, linenum, column):
         pass
 
 
 class CommandChainDispatcher:
     """ Dispatch calls to a chain of commands until some func can handle it
 
     Usage: instantiate, execute "add" to add commands (with optional
     priority), execute normally via f() calling mechanism.
 
     """
     def __init__(self,commands=None):
         if commands is None:
             self.chain = []
         else:
             self.chain = commands
 
 
     def __call__(self,*args, **kw):
         """ Command chain is called just like normal func.
 
         This will call all funcs in chain with the same args as were given to
         this function, and return the result of first func that didn't raise
         TryNext"""
         last_exc = TryNext()
         for prio,cmd in self.chain:
             #print "prio",prio,"cmd",cmd #dbg
             try:
                 return cmd(*args, **kw)
             except TryNext as exc:
                 last_exc = exc
         # if no function will accept it, raise TryNext up to the caller
         raise last_exc
 
     def __str__(self):
         return str(self.chain)
 
     def add(self, func, priority=0):
         """ Add a func to the cmd chain with given priority """
         self.chain.append((priority, func))
         self.chain.sort(key=lambda x: x[0])
 
     def __iter__(self):
         """ Return all objects in chain.
 
         Handy if the objects are not callable.
         """
         return iter(self.chain)
 
 
 def show_in_pager(self, data, start, screen_lines):
     """ Run a string through pager """
     # raising TryNext here will use the default paging functionality
     raise TryNext
 
 
 def pre_prompt_hook(self):
     """ Run before displaying the next prompt
 
     Use this e.g. to display output from asynchronous operations (in order
     to not mess up text entry)
     """
 
     return None
 
 
 def clipboard_get(self):
     """ Get text from the clipboard.
     """
     from ..lib.clipboard import (
-        osx_clipboard_get, tkinter_clipboard_get,
-        win32_clipboard_get
+        osx_clipboard_get,
+        tkinter_clipboard_get,
+        win32_clipboard_get,
+        wayland_clipboard_get,
     )
     if sys.platform == 'win32':
         chain = [win32_clipboard_get, tkinter_clipboard_get]
     elif sys.platform == 'darwin':
         chain = [osx_clipboard_get, tkinter_clipboard_get]
     else:
-        chain = [tkinter_clipboard_get]
+        chain = [wayland_clipboard_get, tkinter_clipboard_get]
     dispatcher = CommandChainDispatcher()
     for func in chain:
         dispatcher.add(func)
     text = dispatcher()
     return text

IPython/core/magics/osm.py

@@ -1,854 +1,855 b''
 """Implementation of magic functions for interaction with the OS.
 
 Note: this module is named 'osm' instead of 'os' to avoid a collision with the
 builtin.
 """
 # Copyright (c) IPython Development Team.
 # Distributed under the terms of the Modified BSD License.
 
 import io
 import os
+import pathlib
 import re
 import sys
 from pprint import pformat
 
 from IPython.core import magic_arguments
 from IPython.core import oinspect
 from IPython.core import page
 from IPython.core.alias import AliasError, Alias
 from IPython.core.error import UsageError
 from IPython.core.magic import  (
     Magics, compress_dhist, magics_class, line_magic, cell_magic, line_cell_magic
 )
 from IPython.testing.skipdoctest import skip_doctest
 from IPython.utils.openpy import source_to_unicode
 from IPython.utils.process import abbrev_cwd
 from IPython.utils.terminal import set_term_title
 from traitlets import Bool
 from warnings import warn
 
 
 @magics_class
 class OSMagics(Magics):
     """Magics to interact with the underlying OS (shell-type functionality).
     """
 
     cd_force_quiet = Bool(False,
         help="Force %cd magic to be quiet even if -q is not passed."
     ).tag(config=True)
 
     def __init__(self, shell=None, **kwargs):
 
         # Now define isexec in a cross platform manner.
         self.is_posix = False
         self.execre = None
         if os.name == 'posix':
             self.is_posix = True
         else:
             try:
                 winext = os.environ['pathext'].replace(';','|').replace('.','')
             except KeyError:
                 winext = 'exe|com|bat|py'
             try:
                 self.execre = re.compile(r'(.*)\.(%s)$' % winext,re.IGNORECASE)
             except re.error:
                 warn("Seems like your pathext environmental "
                      "variable is malformed. Please check it to "
                      "enable a proper handle of file extensions "
                      "managed for your system")
                 winext = 'exe|com|bat|py'
                 self.execre = re.compile(r'(.*)\.(%s)$' % winext,re.IGNORECASE)
 
         # call up the chain
         super().__init__(shell=shell, **kwargs)
 
 
     def _isexec_POSIX(self, file):
         """
         Test for executable on a POSIX system
         """
         if os.access(file.path, os.X_OK):
             # will fail on maxOS if access is not X_OK
             return file.is_file()
         return False
 
 
     
     def _isexec_WIN(self, file):
         """
         Test for executable file on non POSIX system
         """
         return file.is_file() and self.execre.match(file.name) is not None
 
     def isexec(self, file):
         """
         Test for executable file on non POSIX system
         """
         if self.is_posix:
             return self._isexec_POSIX(file)
         else:
             return self._isexec_WIN(file)
 
 
     @skip_doctest
     @line_magic
     def alias(self, parameter_s=''):
         """Define an alias for a system command.
 
         '%alias alias_name cmd' defines 'alias_name' as an alias for 'cmd'
 
         Then, typing 'alias_name params' will execute the system command 'cmd
         params' (from your underlying operating system).
 
         Aliases have lower precedence than magic functions and Python normal
         variables, so if 'foo' is both a Python variable and an alias, the
         alias can not be executed until 'del foo' removes the Python variable.
 
         You can use the %l specifier in an alias definition to represent the
         whole line when the alias is called.  For example::
 
           In [2]: alias bracket echo "Input in brackets: <%l>"
           In [3]: bracket hello world
           Input in brackets: <hello world>
 
         You can also define aliases with parameters using %s specifiers (one
         per parameter)::
 
           In [1]: alias parts echo first %s second %s
           In [2]: %parts A B
           first A second B
           In [3]: %parts A
           Incorrect number of arguments: 2 expected.
           parts is an alias to: 'echo first %s second %s'
 
         Note that %l and %s are mutually exclusive.  You can only use one or
         the other in your aliases.
 
         Aliases expand Python variables just like system calls using ! or !!
         do: all expressions prefixed with '$' get expanded.  For details of
         the semantic rules, see PEP-215:
         https://peps.python.org/pep-0215/.  This is the library used by
         IPython for variable expansion.  If you want to access a true shell
         variable, an extra $ is necessary to prevent its expansion by
         IPython::
 
           In [6]: alias show echo
           In [7]: PATH='A Python string'
           In [8]: show $PATH
           A Python string
           In [9]: show $$PATH
           /usr/local/lf9560/bin:/usr/local/intel/compiler70/ia32/bin:...
 
         You can use the alias facility to access all of $PATH.  See the %rehashx
         function, which automatically creates aliases for the contents of your
         $PATH.
 
         If called with no parameters, %alias prints the current alias table
         for your system.  For posix systems, the default aliases are 'cat',
         'cp', 'mv', 'rm', 'rmdir', and 'mkdir', and other platform-specific
         aliases are added.  For windows-based systems, the default aliases are
         'copy', 'ddir', 'echo', 'ls', 'ldir', 'mkdir', 'ren', and 'rmdir'.
 
         You can see the definition of alias by adding a question mark in the
         end::
 
           In [1]: cat?
           Repr: <alias cat for 'cat'>"""
 
         par = parameter_s.strip()
         if not par:
             aliases = sorted(self.shell.alias_manager.aliases)
             # stored = self.shell.db.get('stored_aliases', {} )
             # for k, v in stored:
             #     atab.append(k, v[0])
 
             print("Total number of aliases:", len(aliases))
             sys.stdout.flush()
             return aliases
 
         # Now try to define a new one
         try:
             alias,cmd = par.split(None, 1)
         except TypeError:
             print(oinspect.getdoc(self.alias))
             return
         
         try:
             self.shell.alias_manager.define_alias(alias, cmd)
         except AliasError as e:
             print(e)
     # end magic_alias
 
     @line_magic
     def unalias(self, parameter_s=''):
         """Remove an alias"""
 
         aname = parameter_s.strip()
         try:
             self.shell.alias_manager.undefine_alias(aname)
         except ValueError as e:
             print(e)
             return
         
         stored = self.shell.db.get('stored_aliases', {} )
         if aname in stored:
             print("Removing %stored alias",aname)
             del stored[aname]
             self.shell.db['stored_aliases'] = stored
 
     @line_magic
     def rehashx(self, parameter_s=''):
         """Update the alias table with all executable files in $PATH.
 
         rehashx explicitly checks that every entry in $PATH is a file
         with execute access (os.X_OK).
 
         Under Windows, it checks executability as a match against a
         '|'-separated string of extensions, stored in the IPython config
         variable win_exec_ext.  This defaults to 'exe|com|bat'.
 
         This function also resets the root module cache of module completer,
         used on slow filesystems.
         """
         from IPython.core.alias import InvalidAliasError
 
         # for the benefit of module completer in ipy_completers.py
         del self.shell.db['rootmodules_cache']
 
         path = [os.path.abspath(os.path.expanduser(p)) for p in
             os.environ.get('PATH','').split(os.pathsep)]
 
         syscmdlist = []
         savedir = os.getcwd()
 
         # Now walk the paths looking for executables to alias.
         try:
             # write the whole loop for posix/Windows so we don't have an if in
             # the innermost part
             if self.is_posix:
                 for pdir in path:
                     try:
                         os.chdir(pdir)
                     except OSError:
                         continue
 
                     # for python 3.6+ rewrite to: with os.scandir(pdir) as dirlist:
                     dirlist = os.scandir(path=pdir)
                     for ff in dirlist:
                         if self.isexec(ff):
                             fname = ff.name
                             try:
                                 # Removes dots from the name since ipython
                                 # will assume names with dots to be python.
                                 if not self.shell.alias_manager.is_alias(fname):
                                     self.shell.alias_manager.define_alias(
                                         fname.replace('.',''), fname)
                             except InvalidAliasError:
                                 pass
                             else:
                                 syscmdlist.append(fname)
             else:
                 no_alias = Alias.blacklist
                 for pdir in path:
                     try:
                         os.chdir(pdir)
                     except OSError:
                         continue
 
                     # for python 3.6+ rewrite to: with os.scandir(pdir) as dirlist:
                     dirlist = os.scandir(pdir)
                     for ff in dirlist:
                         fname = ff.name
                         base, ext = os.path.splitext(fname)
                         if self.isexec(ff) and base.lower() not in no_alias:
                             if ext.lower() == '.exe':
                                 fname = base
                                 try:
                                     # Removes dots from the name since ipython
                                     # will assume names with dots to be python.
                                     self.shell.alias_manager.define_alias(
                                         base.lower().replace('.',''), fname)
                                 except InvalidAliasError:
                                     pass
                                 syscmdlist.append(fname)
 
             self.shell.db['syscmdlist'] = syscmdlist
         finally:
             os.chdir(savedir)
 
     @skip_doctest
     @line_magic
     def pwd(self, parameter_s=''):
         """Return the current working directory path.
 
         Examples
         --------
         ::
 
           In [9]: pwd
           Out[9]: '/home/tsuser/sprint/ipython'
         """
         try:
             return os.getcwd()
         except FileNotFoundError as e:
             raise UsageError("CWD no longer exists - please use %cd to change directory.") from e
 
     @skip_doctest
     @line_magic
     def cd(self, parameter_s=''):
         """Change the current working directory.
 
         This command automatically maintains an internal list of directories
         you visit during your IPython session, in the variable ``_dh``. The
         command :magic:`%dhist` shows this history nicely formatted. You can
         also do ``cd -<tab>`` to see directory history conveniently.
         Usage:
 
           - ``cd 'dir'``: changes to directory 'dir'.
           - ``cd -``: changes to the last visited directory.
           - ``cd -<n>``: changes to the n-th directory in the directory history.
           - ``cd --foo``: change to directory that matches 'foo' in history
           - ``cd -b <bookmark_name>``: jump to a bookmark set by %bookmark
           - Hitting a tab key after ``cd -b`` allows you to tab-complete
             bookmark names.
 
           .. note::
             ``cd <bookmark_name>`` is enough if there is no directory
             ``<bookmark_name>``, but a bookmark with the name exists.
 
         Options:
 
         -q               Be quiet. Do not print the working directory after the
                          cd command is executed. By default IPython's cd
                          command does print this directory, since the default
                          prompts do not display path information.
 
         .. note::
            Note that ``!cd`` doesn't work for this purpose because the shell
            where ``!command`` runs is immediately discarded after executing
            'command'.
 
         Examples
         --------
         ::
 
           In [10]: cd parent/child
           /home/tsuser/parent/child
         """
 
         try:
             oldcwd = os.getcwd()
         except FileNotFoundError:
             # Happens if the CWD has been deleted.
             oldcwd = None
 
         numcd = re.match(r'(-)(\d+)$',parameter_s)
         # jump in directory history by number
         if numcd:
             nn = int(numcd.group(2))
             try:
                 ps = self.shell.user_ns['_dh'][nn]
             except IndexError:
                 print('The requested directory does not exist in history.')
                 return
             else:
                 opts = {}
         elif parameter_s.startswith('--'):
             ps = None
             fallback = None
             pat = parameter_s[2:]
             dh = self.shell.user_ns['_dh']
             # first search only by basename (last component)
             for ent in reversed(dh):
                 if pat in os.path.basename(ent) and os.path.isdir(ent):
                     ps = ent
                     break
 
                 if fallback is None and pat in ent and os.path.isdir(ent):
                     fallback = ent
 
             # if we have no last part match, pick the first full path match
             if ps is None:
                 ps = fallback
 
             if ps is None:
                 print("No matching entry in directory history")
                 return
             else:
                 opts = {}
 
 
         else:
             opts, ps = self.parse_options(parameter_s, 'qb', mode='string')
         # jump to previous
         if ps == '-':
             try:
                 ps = self.shell.user_ns['_dh'][-2]
             except IndexError as e:
                 raise UsageError('%cd -: No previous directory to change to.') from e
         # jump to bookmark if needed
         else:
             if not os.path.isdir(ps) or 'b' in opts:
                 bkms = self.shell.db.get('bookmarks', {})
 
                 if ps in bkms:
                     target = bkms[ps]
                     print('(bookmark:%s) -> %s' % (ps, target))
                     ps = target
                 else:
                     if 'b' in opts:
                         raise UsageError("Bookmark '%s' not found.  "
                               "Use '%%bookmark -l' to see your bookmarks." % ps)
 
         # at this point ps should point to the target dir
         if ps:
             try:
                 os.chdir(os.path.expanduser(ps))
                 if hasattr(self.shell, 'term_title') and self.shell.term_title:
                     set_term_title(self.shell.term_title_format.format(cwd=abbrev_cwd()))
             except OSError:
                 print(sys.exc_info()[1])
             else:
-                cwd = os.getcwd()
+                cwd = pathlib.Path.cwd()
                 dhist = self.shell.user_ns['_dh']
                 if oldcwd != cwd:
                     dhist.append(cwd)
                     self.shell.db['dhist'] = compress_dhist(dhist)[-100:]
 
         else:
             os.chdir(self.shell.home_dir)
             if hasattr(self.shell, 'term_title') and self.shell.term_title:
                 set_term_title(self.shell.term_title_format.format(cwd="~"))
-            cwd = os.getcwd()
+            cwd = pathlib.Path.cwd()
             dhist = self.shell.user_ns['_dh']
 
             if oldcwd != cwd:
                 dhist.append(cwd)
                 self.shell.db['dhist'] = compress_dhist(dhist)[-100:]
         if not 'q' in opts and not self.cd_force_quiet and self.shell.user_ns['_dh']:
             print(self.shell.user_ns['_dh'][-1])
 
     @line_magic
     def env(self, parameter_s=''):
         """Get, set, or list environment variables.
 
         Usage:\\
 
           :``%env``: lists all environment variables/values
           :``%env var``: get value for var
           :``%env var val``: set value for var
           :``%env var=val``: set value for var
           :``%env var=$val``: set value for var, using python expansion if possible
         """
         if parameter_s.strip():
             split = '=' if '=' in parameter_s else ' '
             bits = parameter_s.split(split)
             if len(bits) == 1:
                 key = parameter_s.strip()
                 if key in os.environ:
                     return os.environ[key]
                 else:
                     err = "Environment does not have key: {0}".format(key)
                     raise UsageError(err)
             if len(bits) > 1:
                 return self.set_env(parameter_s)
         env = dict(os.environ)
         # hide likely secrets when printing the whole environment
         for key in list(env):
             if any(s in key.lower() for s in ('key', 'token', 'secret')):
                 env[key] = '<hidden>'
 
         return env
 
     @line_magic
     def set_env(self, parameter_s):
         """Set environment variables.  Assumptions are that either "val" is a
         name in the user namespace, or val is something that evaluates to a
         string.
 
         Usage:\\
           %set_env var val: set value for var
           %set_env var=val: set value for var
           %set_env var=$val: set value for var, using python expansion if possible
         """
         split = '=' if '=' in parameter_s else ' '
         bits = parameter_s.split(split, 1)
         if not parameter_s.strip() or len(bits)<2:
             raise UsageError("usage is 'set_env var=val'")
         var = bits[0].strip()
         val = bits[1].strip()
         if re.match(r'.*\s.*', var):
             # an environment variable with whitespace is almost certainly
             # not what the user intended.  what's more likely is the wrong
             # split was chosen, ie for "set_env cmd_args A=B", we chose
             # '=' for the split and should have chosen ' '.  to get around
             # this, users should just assign directly to os.environ or use
             # standard magic {var} expansion.
             err = "refusing to set env var with whitespace: '{0}'"
             err = err.format(val)
             raise UsageError(err)
         os.environ[var] = val
         print('env: {0}={1}'.format(var,val))
 
     @line_magic
     def pushd(self, parameter_s=''):
         """Place the current dir on stack and change directory.
 
         Usage:\\
           %pushd ['dirname']
         """
 
         dir_s = self.shell.dir_stack
         tgt = os.path.expanduser(parameter_s)
         cwd = os.getcwd().replace(self.shell.home_dir,'~')
         if tgt:
             self.cd(parameter_s)
         dir_s.insert(0,cwd)
         return self.shell.run_line_magic('dirs', '')
 
     @line_magic
     def popd(self, parameter_s=''):
         """Change to directory popped off the top of the stack.
         """
         if not self.shell.dir_stack:
             raise UsageError("%popd on empty stack")
         top = self.shell.dir_stack.pop(0)
         self.cd(top)
         print("popd ->",top)
 
     @line_magic
     def dirs(self, parameter_s=''):
         """Return the current directory stack."""
 
         return self.shell.dir_stack
 
     @line_magic
     def dhist(self, parameter_s=''):
         """Print your history of visited directories.
 
         %dhist       -> print full history\\
         %dhist n     -> print last n entries only\\
         %dhist n1 n2 -> print entries between n1 and n2 (n2 not included)\\
 
         This history is automatically maintained by the %cd command, and
         always available as the global list variable _dh. You can use %cd -<n>
         to go to directory number <n>.
 
         Note that most of time, you should view directory history by entering
         cd -<TAB>.
 
         """
 
         dh = self.shell.user_ns['_dh']
         if parameter_s:
             try:
                 args = map(int,parameter_s.split())
             except:
                 self.arg_err(self.dhist)
                 return
             if len(args) == 1:
                 ini,fin = max(len(dh)-(args[0]),0),len(dh)
             elif len(args) == 2:
                 ini,fin = args
                 fin = min(fin, len(dh))
             else:
                 self.arg_err(self.dhist)
                 return
         else:
             ini,fin = 0,len(dh)
         print('Directory history (kept in _dh)')
         for i in range(ini, fin):
             print("%d: %s" % (i, dh[i]))
 
     @skip_doctest
     @line_magic
     def sc(self, parameter_s=''):
         """Shell capture - run shell command and capture output (DEPRECATED use !).
 
         DEPRECATED. Suboptimal, retained for backwards compatibility.
 
         You should use the form 'var = !command' instead. Example:
 
          "%sc -l myfiles = ls ~" should now be written as
 
          "myfiles = !ls ~"
 
         myfiles.s, myfiles.l and myfiles.n still apply as documented
         below.
 
         --
         %sc [options] varname=command
 
         IPython will run the given command using commands.getoutput(), and
         will then update the user's interactive namespace with a variable
         called varname, containing the value of the call.  Your command can
         contain shell wildcards, pipes, etc.
 
         The '=' sign in the syntax is mandatory, and the variable name you
         supply must follow Python's standard conventions for valid names.
 
         (A special format without variable name exists for internal use)
 
         Options:
 
           -l: list output.  Split the output on newlines into a list before
           assigning it to the given variable.  By default the output is stored
           as a single string.
 
           -v: verbose.  Print the contents of the variable.
 
         In most cases you should not need to split as a list, because the
         returned value is a special type of string which can automatically
         provide its contents either as a list (split on newlines) or as a
         space-separated string.  These are convenient, respectively, either
         for sequential processing or to be passed to a shell command.
 
         For example::
 
             # Capture into variable a
             In [1]: sc a=ls *py
 
             # a is a string with embedded newlines
             In [2]: a
             Out[2]: 'setup.py\\nwin32_manual_post_install.py'
 
             # which can be seen as a list:
             In [3]: a.l
             Out[3]: ['setup.py', 'win32_manual_post_install.py']
 
             # or as a whitespace-separated string:
             In [4]: a.s
             Out[4]: 'setup.py win32_manual_post_install.py'
 
             # a.s is useful to pass as a single command line:
             In [5]: !wc -l $a.s
               146 setup.py
               130 win32_manual_post_install.py
               276 total
 
             # while the list form is useful to loop over:
             In [6]: for f in a.l:
                ...:      !wc -l $f
                ...:
             146 setup.py
             130 win32_manual_post_install.py
 
         Similarly, the lists returned by the -l option are also special, in
         the sense that you can equally invoke the .s attribute on them to
         automatically get a whitespace-separated string from their contents::
 
             In [7]: sc -l b=ls *py
 
             In [8]: b
             Out[8]: ['setup.py', 'win32_manual_post_install.py']
 
             In [9]: b.s
             Out[9]: 'setup.py win32_manual_post_install.py'
 
         In summary, both the lists and strings used for output capture have
         the following special attributes::
 
             .l (or .list) : value as list.
             .n (or .nlstr): value as newline-separated string.
             .s (or .spstr): value as space-separated string.
         """
 
         opts,args = self.parse_options(parameter_s, 'lv')
         # Try to get a variable name and command to run
         try:
             # the variable name must be obtained from the parse_options
             # output, which uses shlex.split to strip options out.
             var,_ = args.split('=', 1)
             var = var.strip()
             # But the command has to be extracted from the original input
             # parameter_s, not on what parse_options returns, to avoid the
             # quote stripping which shlex.split performs on it.
             _,cmd = parameter_s.split('=', 1)
         except ValueError:
             var,cmd = '',''
         # If all looks ok, proceed
         split = 'l' in opts
         out = self.shell.getoutput(cmd, split=split)
         if 'v' in opts:
             print('%s ==\n%s' % (var, pformat(out)))
         if var:
             self.shell.user_ns.update({var:out})
         else:
             return out
 
     @line_cell_magic
     def sx(self, line='', cell=None):
         """Shell execute - run shell command and capture output (!! is short-hand).
 
         %sx command
 
         IPython will run the given command using commands.getoutput(), and
         return the result formatted as a list (split on '\\n').  Since the
         output is _returned_, it will be stored in ipython's regular output
         cache Out[N] and in the '_N' automatic variables.
 
         Notes:
 
         1) If an input line begins with '!!', then %sx is automatically
         invoked.  That is, while::
 
           !ls
 
         causes ipython to simply issue system('ls'), typing::
 
           !!ls
 
         is a shorthand equivalent to::
 
           %sx ls
 
         2) %sx differs from %sc in that %sx automatically splits into a list,
         like '%sc -l'.  The reason for this is to make it as easy as possible
         to process line-oriented shell output via further python commands.
         %sc is meant to provide much finer control, but requires more
         typing.
 
         3) Just like %sc -l, this is a list with special attributes:
         ::
 
           .l (or .list) : value as list.
           .n (or .nlstr): value as newline-separated string.
           .s (or .spstr): value as whitespace-separated string.
 
         This is very useful when trying to use such lists as arguments to
         system commands."""
         
         if cell is None:
             # line magic
             return self.shell.getoutput(line)
         else:
             opts,args = self.parse_options(line, '', 'out=')
             output = self.shell.getoutput(cell)
             out_name = opts.get('out', opts.get('o'))
             if out_name:
                 self.shell.user_ns[out_name] = output
             else:
                 return output
 
     system = line_cell_magic('system')(sx)
     bang = cell_magic('!')(sx)
 
     @line_magic
     def bookmark(self, parameter_s=''):
         """Manage IPython's bookmark system.
 
         %bookmark <name>       - set bookmark to current dir
         %bookmark <name> <dir> - set bookmark to <dir>
         %bookmark -l           - list all bookmarks
         %bookmark -d <name>    - remove bookmark
         %bookmark -r           - remove all bookmarks
 
         You can later on access a bookmarked folder with::
 
           %cd -b <name>
 
         or simply '%cd <name>' if there is no directory called <name> AND
         there is such a bookmark defined.
 
         Your bookmarks persist through IPython sessions, but they are
         associated with each profile."""
 
         opts,args = self.parse_options(parameter_s,'drl',mode='list')
         if len(args) > 2:
             raise UsageError("%bookmark: too many arguments")
 
         bkms = self.shell.db.get('bookmarks',{})
 
         if 'd' in opts:
             try:
                 todel = args[0]
             except IndexError as e:
                 raise UsageError(
                     "%bookmark -d: must provide a bookmark to delete") from e
             else:
                 try:
                     del bkms[todel]
                 except KeyError as e:
                     raise UsageError(
                         "%%bookmark -d: Can't delete bookmark '%s'" % todel) from e
 
         elif 'r' in opts:
             bkms = {}
         elif 'l' in opts:
             bks = sorted(bkms)
             if bks:
                 size = max(map(len, bks))
             else:
                 size = 0
             fmt = '%-'+str(size)+'s -> %s'
             print('Current bookmarks:')
             for bk in bks:
                 print(fmt % (bk, bkms[bk]))
         else:
             if not args:
                 raise UsageError("%bookmark: You must specify the bookmark name")
             elif len(args)==1:
                 bkms[args[0]] = os.getcwd()
             elif len(args)==2:
                 bkms[args[0]] = args[1]
         self.shell.db['bookmarks'] = bkms
 
     @line_magic
     def pycat(self, parameter_s=''):
         """Show a syntax-highlighted file through a pager.
 
         This magic is similar to the cat utility, but it will assume the file
         to be Python source and will show it with syntax highlighting.
 
         This magic command can either take a local filename, an url,
         an history range (see %history) or a macro as argument.
 
         If no parameter is given, prints out history of current session up to
         this point. ::
 
         %pycat myscript.py
         %pycat 7-27
         %pycat myMacro
         %pycat http://www.example.com/myscript.py
         """
         try:
             cont = self.shell.find_user_code(parameter_s, skip_encoding_cookie=False)
         except (ValueError, IOError):
             print("Error: no such file, variable, URL, history range or macro")
             return
 
         page.page(self.shell.pycolorize(source_to_unicode(cont)))
 
     @magic_arguments.magic_arguments()
     @magic_arguments.argument(
         '-a', '--append', action='store_true', default=False,
         help='Append contents of the cell to an existing file. '
              'The file will be created if it does not exist.'
     )
     @magic_arguments.argument(
         'filename', type=str,
         help='file to write'
     )
     @cell_magic
     def writefile(self, line, cell):
         """Write the contents of the cell to a file.
 
         The file will be overwritten unless the -a (--append) flag is specified.
         """
         args = magic_arguments.parse_argstring(self.writefile, line)
         if re.match(r'^(\'.*\')|(".*")$', args.filename):
             filename = os.path.expanduser(args.filename[1:-1])
         else:
             filename = os.path.expanduser(args.filename)
             
         if os.path.exists(filename):
             if args.append:
                 print("Appending to %s" % filename)
             else:
                 print("Overwriting %s" % filename)
         else:
             print("Writing %s" % filename)
         
         mode = 'a' if args.append else 'w'
         with io.open(filename, mode, encoding='utf-8') as f:
             f.write(cell)

IPython/core/release.py

@@ -1,54 +1,54 b''
 # -*- coding: utf-8 -*-
 """Release data for the IPython project."""
 
 #-----------------------------------------------------------------------------
 #  Copyright (c) 2008, IPython Development Team.
 #  Copyright (c) 2001, Fernando Perez <[e-mail]>
 #  Copyright (c) 2001, Janko Hauser <[e-mail]>
 #  Copyright (c) 2001, Nathaniel Gray <[e-mail]>
 #
 #  Distributed under the terms of the Modified BSD License.
 #
 #  The full license is in the file COPYING.txt, distributed with this software.
 #-----------------------------------------------------------------------------
 
 # IPython version information.  An empty _version_extra corresponds to a full
 # release.  'dev' as a _version_extra string means this is a development
 # version
 _version_major = 8
-_version_minor = 5
+_version_minor = 6
 _version_patch = 0
 _version_extra = ".dev"
 # _version_extra = "rc1"
 # _version_extra = ""  # Uncomment this for full releases
 
 # Construct full version string from these.
 _ver = [_version_major, _version_minor, _version_patch]
 
 __version__ = '.'.join(map(str, _ver))
 if _version_extra:
     __version__ = __version__  + _version_extra
 
 version = __version__  # backwards compatibility name
 version_info = (_version_major, _version_minor, _version_patch, _version_extra)
 
 # Change this when incrementing the kernel protocol version
 kernel_protocol_version_info = (5, 0)
 kernel_protocol_version = "%i.%i" % kernel_protocol_version_info
 
 license = 'BSD'
 
 authors = {'Fernando' : ('Fernando Perez','[e-mail]'),
            'Janko'    : ('Janko Hauser','[e-mail]'),
            'Nathan'   : ('Nathaniel Gray','[e-mail]'),
            'Ville'    : ('Ville Vainio','[e-mail]'),
            'Brian'    : ('Brian E Granger', '[e-mail]'),
            'Min'      : ('Min Ragan-Kelley', '[e-mail]'),
            'Thomas'   : ('Thomas A. Kluyver', '[e-mail]'),
            'Jorgen'   : ('Jorgen Stenarson', '[e-mail]'),
            'Matthias' : ('Matthias Bussonnier', '[e-mail]'),
            }
 
 author = 'The IPython Development Team'
 
 author_email = '[e-mail]'

IPython/core/tests/print_argv.py

@@ -1,2 +1,3 b''
 import sys
+
 print(sys.argv[1:])

IPython/core/tests/test_autocall.py

@@ -1,66 +1,67 b''
 """These kinds of tests are less than ideal, but at least they run.
 
 This was an old test that was being run interactively in the top-level tests/
 directory, which we are removing.  For now putting this here ensures at least
 we do run the test, though ultimately this functionality should all be tested
 with better-isolated tests that don't rely on the global instance in iptest.
 """
 from IPython.core.splitinput import LineInfo
 from IPython.core.prefilter import AutocallChecker
 
+
 def doctest_autocall():
     """
     In [1]: def f1(a,b,c):
        ...:     return a+b+c
        ...:
 
     In [2]: def f2(a):
        ...:     return a + a
        ...:
 
     In [3]: def r(x):
        ...:     return True
        ...:
 
     In [4]: ;f2 a b c
     Out[4]: 'a b ca b c'
 
     In [5]: assert _ == "a b ca b c"
 
     In [6]: ,f1 a b c
     Out[6]: 'abc'
 
     In [7]: assert _ == 'abc'
 
     In [8]: print(_)
     abc
 
     In [9]: /f1 1,2,3
     Out[9]: 6
 
     In [10]: assert _ == 6
 
     In [11]: /f2 4
     Out[11]: 8
 
     In [12]: assert _ == 8
 
     In [12]: del f1, f2
 
     In [13]: ,r a
     Out[13]: True
 
     In [14]: assert _ == True
 
     In [15]: r'a'
     Out[15]: 'a'
 
     In [16]: assert _ == 'a'
     """
 
 
 def test_autocall_should_ignore_raw_strings():
     line_info = LineInfo("r'a'")
     pm = ip.prefilter_manager
     ac = AutocallChecker(shell=pm.shell, prefilter_manager=pm, config=pm.config)
     assert ac.check(line_info) is None

IPython/core/tests/test_displayhook.py

@@ -1,112 +1,112 b''
 import sys
 from IPython.testing.tools import AssertPrints, AssertNotPrints
 from IPython.core.displayhook import CapturingDisplayHook
 from IPython.utils.capture import CapturedIO
 
 def test_output_displayed():
     """Checking to make sure that output is displayed"""
   
     with AssertPrints('2'):
        ip.run_cell('1+1', store_history=True)
       
     with AssertPrints('2'):
         ip.run_cell('1+1 # comment with a semicolon;', store_history=True)
 
     with AssertPrints('2'):
         ip.run_cell('1+1\n#commented_out_function();', store_history=True)
 
       
 def test_output_quiet():
     """Checking to make sure that output is quiet"""
   
     with AssertNotPrints('2'):
         ip.run_cell('1+1;', store_history=True)
       
     with AssertNotPrints('2'):
         ip.run_cell('1+1; # comment with a semicolon', store_history=True)
 
     with AssertNotPrints('2'):
         ip.run_cell('1+1;\n#commented_out_function()', store_history=True)
 
-def test_underscore_no_overrite_user():
+def test_underscore_no_overwrite_user():
     ip.run_cell('_ = 42', store_history=True)
     ip.run_cell('1+1', store_history=True)
 
     with AssertPrints('42'):
         ip.run_cell('print(_)', store_history=True)
 
     ip.run_cell('del _', store_history=True)
     ip.run_cell('6+6', store_history=True)
     with AssertPrints('12'):
         ip.run_cell('_', store_history=True)
 
 
-def test_underscore_no_overrite_builtins():
+def test_underscore_no_overwrite_builtins():
     ip.run_cell("import gettext ; gettext.install('foo')", store_history=True)
     ip.run_cell('3+3', store_history=True)
 
     with AssertPrints('gettext'):
         ip.run_cell('print(_)', store_history=True)
 
     ip.run_cell('_ = "userset"', store_history=True)
 
     with AssertPrints('userset'):
         ip.run_cell('print(_)', store_history=True)
     ip.run_cell('import builtins; del builtins._')
 
 
 def test_interactivehooks_ast_modes():
     """
     Test that ast nodes can be triggered with different modes
     """
     saved_mode = ip.ast_node_interactivity
     ip.ast_node_interactivity = 'last_expr_or_assign'
 
     try:
         with AssertPrints('2'):
             ip.run_cell('a = 1+1', store_history=True)
 
         with AssertPrints('9'):
             ip.run_cell('b = 1+8 # comment with a semicolon;', store_history=False)
 
         with AssertPrints('7'):
             ip.run_cell('c = 1+6\n#commented_out_function();', store_history=True)
 
         ip.run_cell('d = 11', store_history=True)
         with AssertPrints('12'):
             ip.run_cell('d += 1', store_history=True)
 
         with AssertNotPrints('42'):
             ip.run_cell('(u,v) = (41+1, 43-1)')
 
     finally:
         ip.ast_node_interactivity = saved_mode
 
 def test_interactivehooks_ast_modes_semi_suppress():
     """
     Test that ast nodes can be triggered with different modes and suppressed
     by semicolon
     """
     saved_mode = ip.ast_node_interactivity
     ip.ast_node_interactivity = 'last_expr_or_assign'
 
     try:
         with AssertNotPrints('2'):
             ip.run_cell('x = 1+1;', store_history=True)
 
         with AssertNotPrints('7'):
             ip.run_cell('y = 1+6; # comment with a semicolon', store_history=True)
 
         with AssertNotPrints('9'):
             ip.run_cell('z = 1+8;\n#commented_out_function()', store_history=True)
 
     finally:
         ip.ast_node_interactivity = saved_mode
 
 def test_capture_display_hook_format():
     """Tests that the capture display hook conforms to the CapturedIO output format"""
     hook = CapturingDisplayHook(ip)
     hook({"foo": "bar"})
     captured = CapturedIO(sys.stdout, sys.stderr, hook.outputs)
     # Should not raise with RichOutput transformation error
     captured.outputs

IPython/core/tests/test_history.py

@@ -1,229 +1,307 b''
 # coding: utf-8
 """Tests for the IPython tab-completion machinery.
 """
 #-----------------------------------------------------------------------------
 # Module imports
 #-----------------------------------------------------------------------------
 
 # stdlib
 import io
 import sqlite3
 import sys
 import tempfile
 from datetime import datetime
 from pathlib import Path
 
 from tempfile import TemporaryDirectory
 # our own packages
 from traitlets.config.loader import Config
 
-from IPython.core.history import HistoryManager, extract_hist_ranges
+from IPython.core.history import HistoryAccessor, HistoryManager, extract_hist_ranges
 
 
 def test_proper_default_encoding():
     assert sys.getdefaultencoding() == "utf-8"
 
 def test_history():
     ip = get_ipython()
     with TemporaryDirectory() as tmpdir:
         tmp_path = Path(tmpdir)
         hist_manager_ori = ip.history_manager
         hist_file = tmp_path / "history.sqlite"
         try:
             ip.history_manager = HistoryManager(shell=ip, hist_file=hist_file)
             hist = ["a=1", "def f():\n    test = 1\n    return test", "b='€Æ¾÷ß'"]
             for i, h in enumerate(hist, start=1):
                 ip.history_manager.store_inputs(i, h)
 
             ip.history_manager.db_log_output = True
             # Doesn't match the input, but we'll just check it's stored.
             ip.history_manager.output_hist_reprs[3] = "spam"
             ip.history_manager.store_output(3)
 
             assert ip.history_manager.input_hist_raw == [""] + hist
 
             # Detailed tests for _get_range_session
             grs = ip.history_manager._get_range_session
             assert list(grs(start=2, stop=-1)) == list(zip([0], [2], hist[1:-1]))
             assert list(grs(start=-2)) == list(zip([0, 0], [2, 3], hist[-2:]))
             assert list(grs(output=True)) == list(
                 zip([0, 0, 0], [1, 2, 3], zip(hist, [None, None, "spam"]))
             )
 
             # Check whether specifying a range beyond the end of the current
             # session results in an error (gh-804)
             ip.run_line_magic("hist", "2-500")
 
             # Check that we can write non-ascii characters to a file
             ip.run_line_magic("hist", "-f %s" % (tmp_path / "test1"))
             ip.run_line_magic("hist", "-pf %s" % (tmp_path / "test2"))
             ip.run_line_magic("hist", "-nf %s" % (tmp_path / "test3"))
             ip.run_line_magic("save", "%s 1-10" % (tmp_path / "test4"))
 
             # New session
             ip.history_manager.reset()
             newcmds = ["z=5", "class X(object):\n    pass", "k='p'", "z=5"]
             for i, cmd in enumerate(newcmds, start=1):
                 ip.history_manager.store_inputs(i, cmd)
             gothist = ip.history_manager.get_range(start=1, stop=4)
             assert list(gothist) == list(zip([0, 0, 0], [1, 2, 3], newcmds))
             # Previous session:
             gothist = ip.history_manager.get_range(-1, 1, 4)
             assert list(gothist) == list(zip([1, 1, 1], [1, 2, 3], hist))
 
             newhist = [(2, i, c) for (i, c) in enumerate(newcmds, 1)]
 
             # Check get_hist_tail
             gothist = ip.history_manager.get_tail(5, output=True,
                                                     include_latest=True)
             expected = [(1, 3, (hist[-1], "spam"))] \
                 + [(s, n, (c, None)) for (s, n, c) in newhist]
             assert list(gothist) == expected
 
             gothist = ip.history_manager.get_tail(2)
             expected = newhist[-3:-1]
             assert list(gothist) == expected
 
             # Check get_hist_search
 
             gothist = ip.history_manager.search("*test*")
             assert list(gothist) == [(1, 2, hist[1])]
 
             gothist = ip.history_manager.search("*=*")
             assert list(gothist) == [
                 (1, 1, hist[0]),
                 (1, 2, hist[1]),
                 (1, 3, hist[2]),
                 newhist[0],
                 newhist[2],
                 newhist[3],
             ]
 
             gothist = ip.history_manager.search("*=*", n=4)
             assert list(gothist) == [
                 (1, 3, hist[2]),
                 newhist[0],
                 newhist[2],
                 newhist[3],
             ]
 
             gothist = ip.history_manager.search("*=*", unique=True)
             assert list(gothist) == [
                 (1, 1, hist[0]),
                 (1, 2, hist[1]),
                 (1, 3, hist[2]),
                 newhist[2],
                 newhist[3],
             ]
 
             gothist = ip.history_manager.search("*=*", unique=True, n=3)
             assert list(gothist) == [(1, 3, hist[2]), newhist[2], newhist[3]]
 
             gothist = ip.history_manager.search("b*", output=True)
             assert list(gothist) == [(1, 3, (hist[2], "spam"))]
 
             # Cross testing: check that magic %save can get previous session.
             testfilename = (tmp_path / "test.py").resolve()
             ip.run_line_magic("save", str(testfilename) + " ~1/1-3")
             with io.open(testfilename, encoding="utf-8") as testfile:
                 assert testfile.read() == "# coding: utf-8\n" + "\n".join(hist) + "\n"
 
             # Duplicate line numbers - check that it doesn't crash, and
             # gets a new session
             ip.history_manager.store_inputs(1, "rogue")
             ip.history_manager.writeout_cache()
             assert ip.history_manager.session_number == 3
 
             # Check that session and line values are not just max values
             sessid, lineno, entry = newhist[-1]
             assert lineno > 1
             ip.history_manager.reset()
             lineno = 1
             ip.history_manager.store_inputs(lineno, entry)
             gothist = ip.history_manager.search("*=*", unique=True)
             hist = list(gothist)[-1]
             assert sessid < hist[0]
             assert hist[1:] == (lineno, entry)
         finally:
             # Ensure saving thread is shut down before we try to clean up the files
             ip.history_manager.save_thread.stop()
             # Forcibly close database rather than relying on garbage collection
             ip.history_manager.db.close()
             # Restore history manager
             ip.history_manager = hist_manager_ori
 
 
 def test_extract_hist_ranges():
     instr = "1 2/3 ~4/5-6 ~4/7-~4/9 ~9/2-~7/5 ~10/"
     expected = [(0, 1, 2),  # 0 == current session
                 (2, 3, 4),
                 (-4, 5, 7),
                 (-4, 7, 10),
                 (-9, 2, None),  # None == to end
                 (-8, 1, None),
                 (-7, 1, 6),
                 (-10, 1, None)]
     actual = list(extract_hist_ranges(instr))
     assert actual == expected
 
 
 def test_extract_hist_ranges_empty_str():
     instr = ""
     expected = [(0, 1, None)]  # 0 == current session, None == to end
     actual = list(extract_hist_ranges(instr))
     assert actual == expected
 
 
 def test_magic_rerun():
     """Simple test for %rerun (no args -> rerun last line)"""
     ip = get_ipython()
     ip.run_cell("a = 10", store_history=True)
     ip.run_cell("a += 1", store_history=True)
     assert ip.user_ns["a"] == 11
     ip.run_cell("%rerun", store_history=True)
     assert ip.user_ns["a"] == 12
 
 def test_timestamp_type():
     ip = get_ipython()
     info = ip.history_manager.get_session_info()
     assert isinstance(info[1], datetime)
 
 def test_hist_file_config():
     cfg = Config()
     tfile = tempfile.NamedTemporaryFile(delete=False)
     cfg.HistoryManager.hist_file = Path(tfile.name)
     try:
         hm = HistoryManager(shell=get_ipython(), config=cfg)
         assert hm.hist_file == cfg.HistoryManager.hist_file
     finally:
         try:
             Path(tfile.name).unlink()
         except OSError:
             # same catch as in testing.tools.TempFileMixin
             # On Windows, even though we close the file, we still can't
             # delete it.  I have no clue why
             pass
 
 def test_histmanager_disabled():
     """Ensure that disabling the history manager doesn't create a database."""
     cfg = Config()
     cfg.HistoryAccessor.enabled = False
 
     ip = get_ipython()
     with TemporaryDirectory() as tmpdir:
         hist_manager_ori = ip.history_manager
         hist_file = Path(tmpdir) / "history.sqlite"
         cfg.HistoryManager.hist_file = hist_file
         try:
             ip.history_manager = HistoryManager(shell=ip, config=cfg)
             hist = ["a=1", "def f():\n    test = 1\n    return test", "b='€Æ¾÷ß'"]
             for i, h in enumerate(hist, start=1):
                 ip.history_manager.store_inputs(i, h)
             assert ip.history_manager.input_hist_raw == [""] + hist
             ip.history_manager.reset()
             ip.history_manager.end_session()
         finally:
             ip.history_manager = hist_manager_ori
 
     # hist_file should not be created
     assert hist_file.exists() is False
+
+
+def test_get_tail_session_awareness():
+    """Test .get_tail() is:
+        - session specific in HistoryManager
+        - session agnostic in HistoryAccessor
+    same for .get_last_session_id()
+    """
+    ip = get_ipython()
+    with TemporaryDirectory() as tmpdir:
+        tmp_path = Path(tmpdir)
+        hist_file = tmp_path / "history.sqlite"
+        get_source = lambda x: x[2]
+        hm1 = None
+        hm2 = None
+        ha = None
+        try:
+            # hm1 creates a new session and adds history entries,
+            # ha catches up
+            hm1 = HistoryManager(shell=ip, hist_file=hist_file)
+            hm1_last_sid = hm1.get_last_session_id
+            ha = HistoryAccessor(hist_file=hist_file)
+            ha_last_sid = ha.get_last_session_id
+
+            hist1 = ["a=1", "b=1", "c=1"]
+            for i, h in enumerate(hist1 + [""], start=1):
+                hm1.store_inputs(i, h)
+            assert list(map(get_source, hm1.get_tail())) == hist1
+            assert list(map(get_source, ha.get_tail())) == hist1
+            sid1 = hm1_last_sid()
+            assert sid1 is not None
+            assert ha_last_sid() == sid1
+
+            # hm2 creates a new session and adds entries,
+            # ha catches up
+            hm2 = HistoryManager(shell=ip, hist_file=hist_file)
+            hm2_last_sid = hm2.get_last_session_id
+
+            hist2 = ["a=2", "b=2", "c=2"]
+            for i, h in enumerate(hist2 + [""], start=1):
+                hm2.store_inputs(i, h)
+            tail = hm2.get_tail(n=3)
+            assert list(map(get_source, tail)) == hist2
+            tail = ha.get_tail(n=3)
+            assert list(map(get_source, tail)) == hist2
+            sid2 = hm2_last_sid()
+            assert sid2 is not None
+            assert ha_last_sid() == sid2
+            assert sid2 != sid1
+
+            # but hm1 still maintains its point of reference
+            # and adding more entries to it doesn't change others
+            # immediate perspective
+            assert hm1_last_sid() == sid1
+            tail = hm1.get_tail(n=3)
+            assert list(map(get_source, tail)) == hist1
+
+            hist3 = ["a=3", "b=3", "c=3"]
+            for i, h in enumerate(hist3 + [""], start=5):
+                hm1.store_inputs(i, h)
+            tail = hm1.get_tail(n=7)
+            assert list(map(get_source, tail)) == hist1 + [""] + hist3
+            tail = hm2.get_tail(n=3)
+            assert list(map(get_source, tail)) == hist2
+            tail = ha.get_tail(n=3)
+            assert list(map(get_source, tail)) == hist2
+            assert hm1_last_sid() == sid1
+            assert hm2_last_sid() == sid2
+            assert ha_last_sid() == sid2
+        finally:
+            if hm1:
+                hm1.save_thread.stop()
+                hm1.db.close()
+            if hm2:
+                hm2.save_thread.stop()
+                hm2.db.close()
+            if ha:
+                ha.db.close()

IPython/core/tests/test_splitinput.py

@@ -1,38 +1,39 b''
 # coding: utf-8
 
 from IPython.core.splitinput import split_user_input, LineInfo
 from IPython.testing import tools as tt
 
 tests = [
     ("x=1", ("", "", "x", "=1")),
     ("?", ("", "?", "", "")),
     ("??", ("", "??", "", "")),
     (" ?", (" ", "?", "", "")),
     (" ??", (" ", "??", "", "")),
     ("??x", ("", "??", "x", "")),
     ("?x=1", ("", "?", "x", "=1")),
     ("!ls", ("", "!", "ls", "")),
     ("  !ls", ("  ", "!", "ls", "")),
     ("!!ls", ("", "!!", "ls", "")),
     ("  !!ls", ("  ", "!!", "ls", "")),
     (",ls", ("", ",", "ls", "")),
     (";ls", ("", ";", "ls", "")),
     ("  ;ls", ("  ", ";", "ls", "")),
     ("f.g(x)", ("", "", "f.g", "(x)")),
     ("f.g (x)", ("", "", "f.g", "(x)")),
     ("?%hist1", ("", "?", "%hist1", "")),
     ("?%%hist2", ("", "?", "%%hist2", "")),
     ("??%hist3", ("", "??", "%hist3", "")),
     ("??%%hist4", ("", "??", "%%hist4", "")),
     ("?x*", ("", "?", "x*", "")),
 ]
 tests.append(("Pérez Fernando", ("", "", "Pérez", "Fernando")))
 
 
 def test_split_user_input():
     return tt.check_pairs(split_user_input, tests)
 
+
 def test_LineInfo():
     """Simple test for LineInfo construction and str()"""
     linfo = LineInfo("  %cd /home")
     assert str(linfo) == "LineInfo [  |%|cd|/home]"

IPython/extensions/autoreload.py

@@ -1,627 +1,627 b''
 """IPython extension to reload modules before executing user code.
 
 ``autoreload`` reloads modules automatically before entering the execution of
 code typed at the IPython prompt.
 
 This makes for example the following workflow possible:
 
 .. sourcecode:: ipython
 
    In [1]: %load_ext autoreload
 
    In [2]: %autoreload 2
 
    In [3]: from foo import some_function
 
    In [4]: some_function()
    Out[4]: 42
 
    In [5]: # open foo.py in an editor and change some_function to return 43
 
    In [6]: some_function()
    Out[6]: 43
 
 The module was reloaded without reloading it explicitly, and the object
 imported with ``from foo import ...`` was also updated.
 
 Usage
 =====
 
 The following magic commands are provided:
 
 ``%autoreload``
 
     Reload all modules (except those excluded by ``%aimport``)
     automatically now.
 
 ``%autoreload 0``
 
     Disable automatic reloading.
 
 ``%autoreload 1``
 
     Reload all modules imported with ``%aimport`` every time before
     executing the Python code typed.
 
 ``%autoreload 2``
 
     Reload all modules (except those excluded by ``%aimport``) every
     time before executing the Python code typed.
 
 ``%autoreload 3``
 
     Reload all modules AND autoload newly added objects
     every time before executing the Python code typed.
 
 ``%aimport``
 
     List modules which are to be automatically imported or not to be imported.
 
 ``%aimport foo``
 
     Import module 'foo' and mark it to be autoreloaded for ``%autoreload 1``
 
 ``%aimport foo, bar``
 
     Import modules 'foo', 'bar' and mark them to be autoreloaded for ``%autoreload 1``
 
 ``%aimport -foo``
 
     Mark module 'foo' to not be autoreloaded.
 
 Caveats
 =======
 
 Reloading Python modules in a reliable way is in general difficult,
 and unexpected things may occur. ``%autoreload`` tries to work around
 common pitfalls by replacing function code objects and parts of
 classes previously in the module with new versions. This makes the
 following things to work:
 
 - Functions and classes imported via 'from xxx import foo' are upgraded
   to new versions when 'xxx' is reloaded.
 
 - Methods and properties of classes are upgraded on reload, so that
   calling 'c.foo()' on an object 'c' created before the reload causes
   the new code for 'foo' to be executed.
 
 Some of the known remaining caveats are:
 
 - Replacing code objects does not always succeed: changing a @property
   in a class to an ordinary method or a method to a member variable
   can cause problems (but in old objects only).
 
 - Functions that are removed (eg. via monkey-patching) from a module
   before it is reloaded are not upgraded.
 
 - C extension modules cannot be reloaded, and so cannot be autoreloaded.
 """
 
 __skip_doctest__ = True
 
 # -----------------------------------------------------------------------------
 #  Copyright (C) 2000 Thomas Heller
 #  Copyright (C) 2008 Pauli Virtanen <[e-mail]>
 #  Copyright (C) 2012  The IPython Development Team
 #
 #  Distributed under the terms of the BSD License.  The full license is in
 #  the file COPYING, distributed as part of this software.
 # -----------------------------------------------------------------------------
 #
 # This IPython module is written by Pauli Virtanen, based on the autoreload
 # code by Thomas Heller.
 
 # -----------------------------------------------------------------------------
 # Imports
 # -----------------------------------------------------------------------------
 
 import os
 import sys
 import traceback
 import types
 import weakref
 import gc
 from importlib import import_module, reload
 from importlib.util import source_from_cache
 
 # ------------------------------------------------------------------------------
 # Autoreload functionality
 # ------------------------------------------------------------------------------
 
 
 class ModuleReloader:
     enabled = False
     """Whether this reloader is enabled"""
 
     check_all = True
     """Autoreload all modules, not just those listed in 'modules'"""
 
     autoload_obj = False
     """Autoreload all modules AND autoload all new objects"""
 
     def __init__(self, shell=None):
         # Modules that failed to reload: {module: mtime-on-failed-reload, ...}
         self.failed = {}
         # Modules specially marked as autoreloadable.
         self.modules = {}
         # Modules specially marked as not autoreloadable.
         self.skip_modules = {}
         # (module-name, name) -> weakref, for replacing old code objects
         self.old_objects = {}
         # Module modification timestamps
         self.modules_mtimes = {}
         self.shell = shell
 
         # Cache module modification times
         self.check(check_all=True, do_reload=False)
 
     def mark_module_skipped(self, module_name):
         """Skip reloading the named module in the future"""
         try:
             del self.modules[module_name]
         except KeyError:
             pass
         self.skip_modules[module_name] = True
 
     def mark_module_reloadable(self, module_name):
         """Reload the named module in the future (if it is imported)"""
         try:
             del self.skip_modules[module_name]
         except KeyError:
             pass
         self.modules[module_name] = True
 
     def aimport_module(self, module_name):
         """Import a module, and mark it reloadable
 
         Returns
         -------
         top_module : module
             The imported module if it is top-level, or the top-level
         top_name : module
             Name of top_module
 
         """
         self.mark_module_reloadable(module_name)
 
         import_module(module_name)
         top_name = module_name.split(".")[0]
         top_module = sys.modules[top_name]
         return top_module, top_name
 
     def filename_and_mtime(self, module):
         if not hasattr(module, "__file__") or module.__file__ is None:
             return None, None
 
         if getattr(module, "__name__", None) in [None, "__mp_main__", "__main__"]:
             # we cannot reload(__main__) or reload(__mp_main__)
             return None, None
 
         filename = module.__file__
         path, ext = os.path.splitext(filename)
 
         if ext.lower() == ".py":
             py_filename = filename
         else:
             try:
                 py_filename = source_from_cache(filename)
             except ValueError:
                 return None, None
 
         try:
             pymtime = os.stat(py_filename).st_mtime
         except OSError:
             return None, None
 
         return py_filename, pymtime
 
     def check(self, check_all=False, do_reload=True):
         """Check whether some modules need to be reloaded."""
 
         if not self.enabled and not check_all:
             return
 
         if check_all or self.check_all:
             modules = list(sys.modules.keys())
         else:
             modules = list(self.modules.keys())
 
         for modname in modules:
             m = sys.modules.get(modname, None)
 
             if modname in self.skip_modules:
                 continue
 
             py_filename, pymtime = self.filename_and_mtime(m)
             if py_filename is None:
                 continue
 
             try:
                 if pymtime <= self.modules_mtimes[modname]:
                     continue
             except KeyError:
                 self.modules_mtimes[modname] = pymtime
                 continue
             else:
                 if self.failed.get(py_filename, None) == pymtime:
                     continue
 
             self.modules_mtimes[modname] = pymtime
 
             # If we've reached this point, we should try to reload the module
             if do_reload:
                 try:
                     if self.autoload_obj:
                         superreload(m, reload, self.old_objects, self.shell)
                     else:
                         superreload(m, reload, self.old_objects)
                     if py_filename in self.failed:
                         del self.failed[py_filename]
                 except:
                     print(
                         "[autoreload of {} failed: {}]".format(
                             modname, traceback.format_exc(10)
                         ),
                         file=sys.stderr,
                     )
                     self.failed[py_filename] = pymtime
 
 
 # ------------------------------------------------------------------------------
 # superreload
 # ------------------------------------------------------------------------------
 
 
 func_attrs = [
     "__code__",
     "__defaults__",
     "__doc__",
     "__closure__",
     "__globals__",
     "__dict__",
 ]
 
 
 def update_function(old, new):
     """Upgrade the code object of a function"""
     for name in func_attrs:
         try:
             setattr(old, name, getattr(new, name))
         except (AttributeError, TypeError):
             pass
 
 
 def update_instances(old, new):
     """Use garbage collector to find all instances that refer to the old
     class definition and update their __class__ to point to the new class
     definition"""
 
     refs = gc.get_referrers(old)
 
     for ref in refs:
         if type(ref) is old:
-            ref.__class__ = new
+            object.__setattr__(ref, "__class__", new)
 
 
 def update_class(old, new):
     """Replace stuff in the __dict__ of a class, and upgrade
     method code objects, and add new methods, if any"""
     for key in list(old.__dict__.keys()):
         old_obj = getattr(old, key)
         try:
             new_obj = getattr(new, key)
             # explicitly checking that comparison returns True to handle
             # cases where `==` doesn't return a boolean.
             if (old_obj == new_obj) is True:
                 continue
         except AttributeError:
             # obsolete attribute: remove it
             try:
                 delattr(old, key)
             except (AttributeError, TypeError):
                 pass
             continue
         except ValueError:
             # can't compare nested structures containing
             # numpy arrays using `==`
             pass
 
         if update_generic(old_obj, new_obj):
             continue
 
         try:
             setattr(old, key, getattr(new, key))
         except (AttributeError, TypeError):
             pass  # skip non-writable attributes
 
     for key in list(new.__dict__.keys()):
         if key not in list(old.__dict__.keys()):
             try:
                 setattr(old, key, getattr(new, key))
             except (AttributeError, TypeError):
                 pass  # skip non-writable attributes
 
     # update all instances of class
     update_instances(old, new)
 
 
 def update_property(old, new):
     """Replace get/set/del functions of a property"""
     update_generic(old.fdel, new.fdel)
     update_generic(old.fget, new.fget)
     update_generic(old.fset, new.fset)
 
 
 def isinstance2(a, b, typ):
     return isinstance(a, typ) and isinstance(b, typ)
 
 
 UPDATE_RULES = [
     (lambda a, b: isinstance2(a, b, type), update_class),
     (lambda a, b: isinstance2(a, b, types.FunctionType), update_function),
     (lambda a, b: isinstance2(a, b, property), update_property),
 ]
 UPDATE_RULES.extend(
     [
         (
             lambda a, b: isinstance2(a, b, types.MethodType),
             lambda a, b: update_function(a.__func__, b.__func__),
         ),
     ]
 )
 
 
 def update_generic(a, b):
     for type_check, update in UPDATE_RULES:
         if type_check(a, b):
             update(a, b)
             return True
     return False
 
 
 class StrongRef:
     def __init__(self, obj):
         self.obj = obj
 
     def __call__(self):
         return self.obj
 
 
 mod_attrs = [
     "__name__",
     "__doc__",
     "__package__",
     "__loader__",
     "__spec__",
     "__file__",
     "__cached__",
     "__builtins__",
 ]
 
 
 def append_obj(module, d, name, obj, autoload=False):
     in_module = hasattr(obj, "__module__") and obj.__module__ == module.__name__
     if autoload:
         # check needed for module global built-ins
         if not in_module and name in mod_attrs:
             return False
     else:
         if not in_module:
             return False
 
     key = (module.__name__, name)
     try:
         d.setdefault(key, []).append(weakref.ref(obj))
     except TypeError:
         pass
     return True
 
 
 def superreload(module, reload=reload, old_objects=None, shell=None):
     """Enhanced version of the builtin reload function.
 
     superreload remembers objects previously in the module, and
 
     - upgrades the class dictionary of every old class in the module
     - upgrades the code object of every old function and method
     - clears the module's namespace before reloading
 
     """
     if old_objects is None:
         old_objects = {}
 
     # collect old objects in the module
     for name, obj in list(module.__dict__.items()):
         if not append_obj(module, old_objects, name, obj):
             continue
         key = (module.__name__, name)
         try:
             old_objects.setdefault(key, []).append(weakref.ref(obj))
         except TypeError:
             pass
 
     # reload module
     try:
         # clear namespace first from old cruft
         old_dict = module.__dict__.copy()
         old_name = module.__name__
         module.__dict__.clear()
         module.__dict__["__name__"] = old_name
         module.__dict__["__loader__"] = old_dict["__loader__"]
     except (TypeError, AttributeError, KeyError):
         pass
 
     try:
         module = reload(module)
     except:
         # restore module dictionary on failed reload
         module.__dict__.update(old_dict)
         raise
 
     # iterate over all objects and update functions & classes
     for name, new_obj in list(module.__dict__.items()):
         key = (module.__name__, name)
         if key not in old_objects:
             # here 'shell' acts both as a flag and as an output var
             if (
                 shell is None
                 or name == "Enum"
                 or not append_obj(module, old_objects, name, new_obj, True)
             ):
                 continue
             shell.user_ns[name] = new_obj
 
         new_refs = []
         for old_ref in old_objects[key]:
             old_obj = old_ref()
             if old_obj is None:
                 continue
             new_refs.append(old_ref)
             update_generic(old_obj, new_obj)
 
         if new_refs:
             old_objects[key] = new_refs
         else:
             del old_objects[key]
 
     return module
 
 
 # ------------------------------------------------------------------------------
 # IPython connectivity
 # ------------------------------------------------------------------------------
 
 from IPython.core.magic import Magics, magics_class, line_magic
 
 
 @magics_class
 class AutoreloadMagics(Magics):
     def __init__(self, *a, **kw):
         super().__init__(*a, **kw)
         self._reloader = ModuleReloader(self.shell)
         self._reloader.check_all = False
         self._reloader.autoload_obj = False
         self.loaded_modules = set(sys.modules)
 
     @line_magic
     def autoreload(self, parameter_s=""):
         r"""%autoreload => Reload modules automatically
 
         %autoreload
         Reload all modules (except those excluded by %aimport) automatically
         now.
 
         %autoreload 0
         Disable automatic reloading.
 
         %autoreload 1
         Reload all modules imported with %aimport every time before executing
         the Python code typed.
 
         %autoreload 2
         Reload all modules (except those excluded by %aimport) every time
         before executing the Python code typed.
 
         Reloading Python modules in a reliable way is in general
         difficult, and unexpected things may occur. %autoreload tries to
         work around common pitfalls by replacing function code objects and
         parts of classes previously in the module with new versions. This
         makes the following things to work:
 
         - Functions and classes imported via 'from xxx import foo' are upgraded
           to new versions when 'xxx' is reloaded.
 
         - Methods and properties of classes are upgraded on reload, so that
           calling 'c.foo()' on an object 'c' created before the reload causes
           the new code for 'foo' to be executed.
 
         Some of the known remaining caveats are:
 
         - Replacing code objects does not always succeed: changing a @property
           in a class to an ordinary method or a method to a member variable
           can cause problems (but in old objects only).
 
         - Functions that are removed (eg. via monkey-patching) from a module
           before it is reloaded are not upgraded.
 
         - C extension modules cannot be reloaded, and so cannot be
           autoreloaded.
 
         """
         if parameter_s == "":
             self._reloader.check(True)
         elif parameter_s == "0":
             self._reloader.enabled = False
         elif parameter_s == "1":
             self._reloader.check_all = False
             self._reloader.enabled = True
         elif parameter_s == "2":
             self._reloader.check_all = True
             self._reloader.enabled = True
             self._reloader.enabled = True
         elif parameter_s == "3":
             self._reloader.check_all = True
             self._reloader.enabled = True
             self._reloader.autoload_obj = True
 
     @line_magic
     def aimport(self, parameter_s="", stream=None):
         """%aimport => Import modules for automatic reloading.
 
         %aimport
         List modules to automatically import and not to import.
 
         %aimport foo
         Import module 'foo' and mark it to be autoreloaded for %autoreload 1
 
         %aimport foo, bar
         Import modules 'foo', 'bar' and mark them to be autoreloaded for %autoreload 1
 
         %aimport -foo
         Mark module 'foo' to not be autoreloaded for %autoreload 1
         """
         modname = parameter_s
         if not modname:
             to_reload = sorted(self._reloader.modules.keys())
             to_skip = sorted(self._reloader.skip_modules.keys())
             if stream is None:
                 stream = sys.stdout
             if self._reloader.check_all:
                 stream.write("Modules to reload:\nall-except-skipped\n")
             else:
                 stream.write("Modules to reload:\n%s\n" % " ".join(to_reload))
             stream.write("\nModules to skip:\n%s\n" % " ".join(to_skip))
         elif modname.startswith("-"):
             modname = modname[1:]
             self._reloader.mark_module_skipped(modname)
         else:
             for _module in [_.strip() for _ in modname.split(",")]:
                 top_module, top_name = self._reloader.aimport_module(_module)
 
                 # Inject module to user namespace
                 self.shell.push({top_name: top_module})
 
     def pre_run_cell(self):
         if self._reloader.enabled:
             try:
                 self._reloader.check()
             except:
                 pass
 
     def post_execute_hook(self):
         """Cache the modification times of any modules imported in this execution"""
         newly_loaded_modules = set(sys.modules) - self.loaded_modules
         for modname in newly_loaded_modules:
             _, pymtime = self._reloader.filename_and_mtime(sys.modules[modname])
             if pymtime is not None:
                 self._reloader.modules_mtimes[modname] = pymtime
 
         self.loaded_modules.update(newly_loaded_modules)
 
 
 def load_ipython_extension(ip):
     """Load the extension in IPython."""
     auto_reload = AutoreloadMagics(ip)
     ip.register_magics(auto_reload)
     ip.events.register("pre_run_cell", auto_reload.pre_run_cell)
     ip.events.register("post_execute", auto_reload.post_execute_hook)

IPython/lib/clipboard.py

@@ -1,69 +1,101 b''
 """ Utilities for accessing the platform's clipboard.
 """
-
+import os
 import subprocess
 
 from IPython.core.error import TryNext
 import IPython.utils.py3compat as py3compat
 
+
 class ClipboardEmpty(ValueError):
     pass
 
+
 def win32_clipboard_get():
     """ Get the current clipboard's text on Windows.
 
     Requires Mark Hammond's pywin32 extensions.
     """
     try:
         import win32clipboard
     except ImportError as e:
         raise TryNext("Getting text from the clipboard requires the pywin32 "
                       "extensions: http://sourceforge.net/projects/pywin32/") from e
     win32clipboard.OpenClipboard()
     try:
         text = win32clipboard.GetClipboardData(win32clipboard.CF_UNICODETEXT)
     except (TypeError, win32clipboard.error):
         try:
             text = win32clipboard.GetClipboardData(win32clipboard.CF_TEXT)
             text = py3compat.cast_unicode(text, py3compat.DEFAULT_ENCODING)
         except (TypeError, win32clipboard.error) as e:
             raise ClipboardEmpty from e
     finally:
         win32clipboard.CloseClipboard()
     return text
 
+
 def osx_clipboard_get() -> str:
     """ Get the clipboard's text on OS X.
     """
     p = subprocess.Popen(['pbpaste', '-Prefer', 'ascii'],
         stdout=subprocess.PIPE)
     bytes_, stderr = p.communicate()
     # Text comes in with old Mac \r line endings. Change them to \n.
     bytes_ = bytes_.replace(b'\r', b'\n')
     text = py3compat.decode(bytes_)
     return text
 
+
 def tkinter_clipboard_get():
     """ Get the clipboard's text using Tkinter.
 
     This is the default on systems that are not Windows or OS X. It may
     interfere with other UI toolkits and should be replaced with an
     implementation that uses that toolkit.
     """
     try:
         from tkinter import Tk, TclError 
     except ImportError as e:
         raise TryNext("Getting text from the clipboard on this platform requires tkinter.") from e
         
     root = Tk()
     root.withdraw()
     try:
         text = root.clipboard_get()
     except TclError as e:
         raise ClipboardEmpty from e
     finally:
         root.destroy()
     text = py3compat.cast_unicode(text, py3compat.DEFAULT_ENCODING)
     return text
 
 
+def wayland_clipboard_get():
+    """Get the clipboard's text under Wayland using wl-paste command.
+
+    This requires Wayland and wl-clipboard installed and running.
+    """
+    if os.environ.get("XDG_SESSION_TYPE") != "wayland":
+        raise TryNext("wayland is not detected")
+
+    try:
+        with subprocess.Popen(["wl-paste"], stdout=subprocess.PIPE) as p:
+            raw, err = p.communicate()
+            if p.wait():
+                raise TryNext(err)
+    except FileNotFoundError as e:
+        raise TryNext(
+            "Getting text from the clipboard under Wayland requires the wl-clipboard "
+            "extension: https://github.com/bugaevc/wl-clipboard"
+        ) from e
+
+    if not raw:
+        raise ClipboardEmpty
+
+    try:
+        text = py3compat.decode(raw)
+    except UnicodeDecodeError as e:
+        raise ClipboardEmpty from e
+
+    return text

IPython/lib/latextools.py

@@ -1,246 +1,258 b''
 # -*- coding: utf-8 -*-
 """Tools for handling LaTeX."""
 
 # Copyright (c) IPython Development Team.
 # Distributed under the terms of the Modified BSD License.
 
 from io import BytesIO, open
 import os
 import tempfile
 import shutil
 import subprocess
 from base64 import encodebytes
 import textwrap
 
 from pathlib import Path, PurePath
 
 from IPython.utils.process import find_cmd, FindCmdError
 from traitlets.config import get_config
 from traitlets.config.configurable import SingletonConfigurable
 from traitlets import List, Bool, Unicode
 from IPython.utils.py3compat import cast_unicode
 
 
 class LaTeXTool(SingletonConfigurable):
     """An object to store configuration of the LaTeX tool."""
     def _config_default(self):
         return get_config()
 
     backends = List(
         Unicode(), ["matplotlib", "dvipng"],
         help="Preferred backend to draw LaTeX math equations. "
         "Backends in the list are checked one by one and the first "
         "usable one is used.  Note that `matplotlib` backend "
         "is usable only for inline style equations.  To draw  "
         "display style equations, `dvipng` backend must be specified. ",
         # It is a List instead of Enum, to make configuration more
         # flexible.  For example, to use matplotlib mainly but dvipng
         # for display style, the default ["matplotlib", "dvipng"] can
         # be used.  To NOT use dvipng so that other repr such as
         # unicode pretty printing is used, you can use ["matplotlib"].
         ).tag(config=True)
 
     use_breqn = Bool(
         True,
         help="Use breqn.sty to automatically break long equations. "
         "This configuration takes effect only for dvipng backend.",
         ).tag(config=True)
 
     packages = List(
         ['amsmath', 'amsthm', 'amssymb', 'bm'],
         help="A list of packages to use for dvipng backend. "
         "'breqn' will be automatically appended when use_breqn=True.",
         ).tag(config=True)
 
     preamble = Unicode(
         help="Additional preamble to use when generating LaTeX source "
         "for dvipng backend.",
         ).tag(config=True)
 
 
 def latex_to_png(s, encode=False, backend=None, wrap=False, color='Black',
                  scale=1.0):
     """Render a LaTeX string to PNG.
 
     Parameters
     ----------
     s : str
         The raw string containing valid inline LaTeX.
     encode : bool, optional
         Should the PNG data base64 encoded to make it JSON'able.
     backend : {matplotlib, dvipng}
         Backend for producing PNG data.
     wrap : bool
         If true, Automatically wrap `s` as a LaTeX equation.
     color : string
         Foreground color name among dvipsnames, e.g. 'Maroon' or on hex RGB
         format, e.g. '#AA20FA'.
     scale : float
         Scale factor for the resulting PNG.
     None is returned when the backend cannot be used.
 
     """
     s = cast_unicode(s)
     allowed_backends = LaTeXTool.instance().backends
     if backend is None:
         backend = allowed_backends[0]
     if backend not in allowed_backends:
         return None
     if backend == 'matplotlib':
         f = latex_to_png_mpl
     elif backend == 'dvipng':
         f = latex_to_png_dvipng
         if color.startswith('#'):
             # Convert hex RGB color to LaTeX RGB color.
             if len(color) == 7:
                 try:
                     color = "RGB {}".format(" ".join([str(int(x, 16)) for x in
                                                       textwrap.wrap(color[1:], 2)]))
                 except ValueError as e:
                     raise ValueError('Invalid color specification {}.'.format(color)) from e
             else:
                 raise ValueError('Invalid color specification {}.'.format(color))
     else:
         raise ValueError('No such backend {0}'.format(backend))
     bin_data = f(s, wrap, color, scale)
     if encode and bin_data:
         bin_data = encodebytes(bin_data)
     return bin_data
 
 
 def latex_to_png_mpl(s, wrap, color='Black', scale=1.0):
     try:
         from matplotlib import figure, font_manager, mathtext
         from matplotlib.backends import backend_agg
         from pyparsing import ParseFatalException
     except ImportError:
         return None
 
     # mpl mathtext doesn't support display math, force inline
     s = s.replace('$$', '$')
     if wrap:
         s = u'${0}$'.format(s)
 
     try:
         prop = font_manager.FontProperties(size=12)
         dpi = 120 * scale
         buffer = BytesIO()
 
         # Adapted from mathtext.math_to_image
         parser = mathtext.MathTextParser("path")
         width, height, depth, _, _ = parser.parse(s, dpi=72, prop=prop)
         fig = figure.Figure(figsize=(width / 72, height / 72))
         fig.text(0, depth / height, s, fontproperties=prop, color=color)
         backend_agg.FigureCanvasAgg(fig)
         fig.savefig(buffer, dpi=dpi, format="png", transparent=True)
         return buffer.getvalue()
     except (ValueError, RuntimeError, ParseFatalException):
         return None
 
 
 def latex_to_png_dvipng(s, wrap, color='Black', scale=1.0):
     try:
         find_cmd('latex')
         find_cmd('dvipng')
     except FindCmdError:
         return None
+
+    startupinfo = None
+    if os.name == "nt":
+        # prevent popup-windows
+        startupinfo = subprocess.STARTUPINFO()
+        startupinfo.dwFlags |= subprocess.STARTF_USESHOWWINDOW
+
     try:
         workdir = Path(tempfile.mkdtemp())
-        tmpfile = workdir.joinpath("tmp.tex")
-        dvifile = workdir.joinpath("tmp.dvi")
-        outfile = workdir.joinpath("tmp.png")
+        tmpfile = "tmp.tex"
+        dvifile = "tmp.dvi"
+        outfile = "tmp.png"
 
-        with tmpfile.open("w", encoding="utf8") as f:
+        with workdir.joinpath(tmpfile).open("w", encoding="utf8") as f:
             f.writelines(genelatex(s, wrap))
 
         with open(os.devnull, 'wb') as devnull:
             subprocess.check_call(
                 ["latex", "-halt-on-error", "-interaction", "batchmode", tmpfile],
-                cwd=workdir, stdout=devnull, stderr=devnull)
+                cwd=workdir,
+                stdout=devnull,
+                stderr=devnull,
+                startupinfo=startupinfo,
+            )
 
             resolution = round(150*scale)
             subprocess.check_call(
                 [
                     "dvipng",
                     "-T",
                     "tight",
                     "-D",
                     str(resolution),
                     "-z",
                     "9",
                     "-bg",
                     "Transparent",
                     "-o",
                     outfile,
                     dvifile,
                     "-fg",
                     color,
                 ],
                 cwd=workdir,
                 stdout=devnull,
                 stderr=devnull,
+                startupinfo=startupinfo,
             )
 
-        with outfile.open("rb") as f:
+        with workdir.joinpath(outfile).open("rb") as f:
             return f.read()
     except subprocess.CalledProcessError:
         return None
     finally:
         shutil.rmtree(workdir)
 
 
 def kpsewhich(filename):
     """Invoke kpsewhich command with an argument `filename`."""
     try:
         find_cmd("kpsewhich")
         proc = subprocess.Popen(
             ["kpsewhich", filename],
             stdout=subprocess.PIPE, stderr=subprocess.PIPE)
         (stdout, stderr) = proc.communicate()
         return stdout.strip().decode('utf8', 'replace')
     except FindCmdError:
         pass
 
 
 def genelatex(body, wrap):
     """Generate LaTeX document for dvipng backend."""
     lt = LaTeXTool.instance()
     breqn = wrap and lt.use_breqn and kpsewhich("breqn.sty")
     yield r'\documentclass{article}'
     packages = lt.packages
     if breqn:
         packages = packages + ['breqn']
     for pack in packages:
         yield r'\usepackage{{{0}}}'.format(pack)
     yield r'\pagestyle{empty}'
     if lt.preamble:
         yield lt.preamble
     yield r'\begin{document}'
     if breqn:
         yield r'\begin{dmath*}'
         yield body
         yield r'\end{dmath*}'
     elif wrap:
         yield u'$${0}$$'.format(body)
     else:
         yield body
     yield u'\\end{document}'
 
 
 _data_uri_template_png = u"""<img src="data:image/png;base64,%s" alt=%s />"""
 
 def latex_to_html(s, alt='image'):
     """Render LaTeX to HTML with embedded PNG data using data URIs.
 
     Parameters
     ----------
     s : str
         The raw string containing valid inline LateX.
     alt : str
         The alt text to use for the HTML.
     """
     base64_data = latex_to_png(s, encode=True).decode('ascii')
     if base64_data:
         return _data_uri_template_png  % (base64_data, alt)
 
 

IPython/lib/pretty.py

@@ -1,951 +1,953 b''
 # -*- coding: utf-8 -*-
 """
 Python advanced pretty printer.  This pretty printer is intended to
 replace the old `pprint` python module which does not allow developers
 to provide their own pretty print callbacks.
 
 This module is based on ruby's `prettyprint.rb` library by `Tanaka Akira`.
 
 
 Example Usage
 -------------
 
 To directly print the representation of an object use `pprint`::
 
     from pretty import pprint
     pprint(complex_object)
 
 To get a string of the output use `pretty`::
 
     from pretty import pretty
     string = pretty(complex_object)
 
 
 Extending
 ---------
 
 The pretty library allows developers to add pretty printing rules for their
 own objects.  This process is straightforward.  All you have to do is to
 add a `_repr_pretty_` method to your object and call the methods on the
 pretty printer passed::
 
     class MyObject(object):
 
         def _repr_pretty_(self, p, cycle):
             ...
 
 Here's an example for a class with a simple constructor::
 
     class MySimpleObject:
 
         def __init__(self, a, b, *, c=None):
             self.a = a
             self.b = b
             self.c = c
 
         def _repr_pretty_(self, p, cycle):
             ctor = CallExpression.factory(self.__class__.__name__)
             if self.c is None:
                 p.pretty(ctor(a, b))
             else:
                 p.pretty(ctor(a, b, c=c))
 
 Here is an example implementation of a `_repr_pretty_` method for a list
 subclass::
 
     class MyList(list):
 
         def _repr_pretty_(self, p, cycle):
             if cycle:
                 p.text('MyList(...)')
             else:
                 with p.group(8, 'MyList([', '])'):
                     for idx, item in enumerate(self):
                         if idx:
                             p.text(',')
                             p.breakable()
                         p.pretty(item)
 
 The `cycle` parameter is `True` if pretty detected a cycle.  You *have* to
 react to that or the result is an infinite loop.  `p.text()` just adds
 non breaking text to the output, `p.breakable()` either adds a whitespace
 or breaks here.  If you pass it an argument it's used instead of the
 default space.  `p.pretty` prettyprints another object using the pretty print
 method.
 
 The first parameter to the `group` function specifies the extra indentation
 of the next line.  In this example the next item will either be on the same
 line (if the items are short enough) or aligned with the right edge of the
 opening bracket of `MyList`.
 
 If you just want to indent something you can use the group function
 without open / close parameters.  You can also use this code::
 
     with p.indent(2):
         ...
 
 Inheritance diagram:
 
 .. inheritance-diagram:: IPython.lib.pretty
    :parts: 3
 
 :copyright: 2007 by Armin Ronacher.
             Portions (c) 2009 by Robert Kern.
 :license: BSD License.
 """
 
 from contextlib import contextmanager
 import datetime
 import os
 import re
 import sys
 import types
 from collections import deque
 from inspect import signature
 from io import StringIO
 from warnings import warn
 
 from IPython.utils.decorators import undoc
 from IPython.utils.py3compat import PYPY
 
 __all__ = ['pretty', 'pprint', 'PrettyPrinter', 'RepresentationPrinter',
     'for_type', 'for_type_by_name', 'RawText', 'RawStringLiteral', 'CallExpression']
 
 
 MAX_SEQ_LENGTH = 1000
 _re_pattern_type = type(re.compile(''))
 
 def _safe_getattr(obj, attr, default=None):
     """Safe version of getattr.
 
     Same as getattr, but will return ``default`` on any Exception,
     rather than raising.
     """
     try:
         return getattr(obj, attr, default)
     except Exception:
         return default
 
 @undoc
 class CUnicodeIO(StringIO):
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
         warn(("CUnicodeIO is deprecated since IPython 6.0. "
               "Please use io.StringIO instead."),
              DeprecationWarning, stacklevel=2)
 
 def _sorted_for_pprint(items):
     """
     Sort the given items for pretty printing. Since some predictable
     sorting is better than no sorting at all, we sort on the string
     representation if normal sorting fails.
     """
     items = list(items)
     try:
         return sorted(items)
     except Exception:
         try:
             return sorted(items, key=str)
         except Exception:
             return items
 
 def pretty(obj, verbose=False, max_width=79, newline='\n', max_seq_length=MAX_SEQ_LENGTH):
     """
     Pretty print the object's representation.
     """
     stream = StringIO()
     printer = RepresentationPrinter(stream, verbose, max_width, newline, max_seq_length=max_seq_length)
     printer.pretty(obj)
     printer.flush()
     return stream.getvalue()
 
 
 def pprint(obj, verbose=False, max_width=79, newline='\n', max_seq_length=MAX_SEQ_LENGTH):
     """
     Like `pretty` but print to stdout.
     """
     printer = RepresentationPrinter(sys.stdout, verbose, max_width, newline, max_seq_length=max_seq_length)
     printer.pretty(obj)
     printer.flush()
     sys.stdout.write(newline)
     sys.stdout.flush()
 
 class _PrettyPrinterBase(object):
 
     @contextmanager
     def indent(self, indent):
         """with statement support for indenting/dedenting."""
         self.indentation += indent
         try:
             yield
         finally:
             self.indentation -= indent
 
     @contextmanager
     def group(self, indent=0, open='', close=''):
         """like begin_group / end_group but for the with statement."""
         self.begin_group(indent, open)
         try:
             yield
         finally:
             self.end_group(indent, close)
 
 class PrettyPrinter(_PrettyPrinterBase):
     """
     Baseclass for the `RepresentationPrinter` prettyprinter that is used to
     generate pretty reprs of objects.  Contrary to the `RepresentationPrinter`
     this printer knows nothing about the default pprinters or the `_repr_pretty_`
     callback method.
     """
 
     def __init__(self, output, max_width=79, newline='\n', max_seq_length=MAX_SEQ_LENGTH):
         self.output = output
         self.max_width = max_width
         self.newline = newline
         self.max_seq_length = max_seq_length
         self.output_width = 0
         self.buffer_width = 0
         self.buffer = deque()
 
         root_group = Group(0)
         self.group_stack = [root_group]
         self.group_queue = GroupQueue(root_group)
         self.indentation = 0
 
     def _break_one_group(self, group):
         while group.breakables:
             x = self.buffer.popleft()
             self.output_width = x.output(self.output, self.output_width)
             self.buffer_width -= x.width
         while self.buffer and isinstance(self.buffer[0], Text):
             x = self.buffer.popleft()
             self.output_width = x.output(self.output, self.output_width)
             self.buffer_width -= x.width
 
     def _break_outer_groups(self):
         while self.max_width < self.output_width + self.buffer_width:
             group = self.group_queue.deq()
             if not group:
                 return
             self._break_one_group(group)
 
     def text(self, obj):
         """Add literal text to the output."""
         width = len(obj)
         if self.buffer:
             text = self.buffer[-1]
             if not isinstance(text, Text):
                 text = Text()
                 self.buffer.append(text)
             text.add(obj, width)
             self.buffer_width += width
             self._break_outer_groups()
         else:
             self.output.write(obj)
             self.output_width += width
 
     def breakable(self, sep=' '):
         """
         Add a breakable separator to the output.  This does not mean that it
         will automatically break here.  If no breaking on this position takes
         place the `sep` is inserted which default to one space.
         """
         width = len(sep)
         group = self.group_stack[-1]
         if group.want_break:
             self.flush()
             self.output.write(self.newline)
             self.output.write(' ' * self.indentation)
             self.output_width = self.indentation
             self.buffer_width = 0
         else:
             self.buffer.append(Breakable(sep, width, self))
             self.buffer_width += width
             self._break_outer_groups()
 
     def break_(self):
         """
         Explicitly insert a newline into the output, maintaining correct indentation.
         """
         group = self.group_queue.deq()
         if group:
             self._break_one_group(group)
         self.flush()
         self.output.write(self.newline)
         self.output.write(' ' * self.indentation)
         self.output_width = self.indentation
         self.buffer_width = 0
 
 
     def begin_group(self, indent=0, open=''):
         """
         Begin a group.
         The first parameter specifies the indentation for the next line (usually
         the width of the opening text), the second the opening text.  All
         parameters are optional.
         """
         if open:
             self.text(open)
         group = Group(self.group_stack[-1].depth + 1)
         self.group_stack.append(group)
         self.group_queue.enq(group)
         self.indentation += indent
 
     def _enumerate(self, seq):
         """like enumerate, but with an upper limit on the number of items"""
         for idx, x in enumerate(seq):
             if self.max_seq_length and idx >= self.max_seq_length:
                 self.text(',')
                 self.breakable()
                 self.text('...')
                 return
             yield idx, x
 
     def end_group(self, dedent=0, close=''):
         """End a group. See `begin_group` for more details."""
         self.indentation -= dedent
         group = self.group_stack.pop()
         if not group.breakables:
             self.group_queue.remove(group)
         if close:
             self.text(close)
 
     def flush(self):
         """Flush data that is left in the buffer."""
         for data in self.buffer:
             self.output_width += data.output(self.output, self.output_width)
         self.buffer.clear()
         self.buffer_width = 0
 
 
 def _get_mro(obj_class):
     """ Get a reasonable method resolution order of a class and its superclasses
     for both old-style and new-style classes.
     """
     if not hasattr(obj_class, '__mro__'):
         # Old-style class. Mix in object to make a fake new-style class.
         try:
             obj_class = type(obj_class.__name__, (obj_class, object), {})
         except TypeError:
             # Old-style extension type that does not descend from object.
             # FIXME: try to construct a more thorough MRO.
             mro = [obj_class]
         else:
             mro = obj_class.__mro__[1:-1]
     else:
         mro = obj_class.__mro__
     return mro
 
 
 class RepresentationPrinter(PrettyPrinter):
     """
     Special pretty printer that has a `pretty` method that calls the pretty
     printer for a python object.
 
     This class stores processing data on `self` so you must *never* use
     this class in a threaded environment.  Always lock it or reinstanciate
     it.
 
     Instances also have a verbose flag callbacks can access to control their
     output.  For example the default instance repr prints all attributes and
     methods that are not prefixed by an underscore if the printer is in
     verbose mode.
     """
 
     def __init__(self, output, verbose=False, max_width=79, newline='\n',
         singleton_pprinters=None, type_pprinters=None, deferred_pprinters=None,
         max_seq_length=MAX_SEQ_LENGTH):
 
         PrettyPrinter.__init__(self, output, max_width, newline, max_seq_length=max_seq_length)
         self.verbose = verbose
         self.stack = []
         if singleton_pprinters is None:
             singleton_pprinters = _singleton_pprinters.copy()
         self.singleton_pprinters = singleton_pprinters
         if type_pprinters is None:
             type_pprinters = _type_pprinters.copy()
         self.type_pprinters = type_pprinters
         if deferred_pprinters is None:
             deferred_pprinters = _deferred_type_pprinters.copy()
         self.deferred_pprinters = deferred_pprinters
 
     def pretty(self, obj):
         """Pretty print the given object."""
         obj_id = id(obj)
         cycle = obj_id in self.stack
         self.stack.append(obj_id)
         self.begin_group()
         try:
             obj_class = _safe_getattr(obj, '__class__', None) or type(obj)
             # First try to find registered singleton printers for the type.
             try:
                 printer = self.singleton_pprinters[obj_id]
             except (TypeError, KeyError):
                 pass
             else:
                 return printer(obj, self, cycle)
             # Next walk the mro and check for either:
             #   1) a registered printer
             #   2) a _repr_pretty_ method
             for cls in _get_mro(obj_class):
                 if cls in self.type_pprinters:
                     # printer registered in self.type_pprinters
                     return self.type_pprinters[cls](obj, self, cycle)
                 else:
                     # deferred printer
                     printer = self._in_deferred_types(cls)
                     if printer is not None:
                         return printer(obj, self, cycle)
                     else:
                         # Finally look for special method names.
                         # Some objects automatically create any requested
                         # attribute. Try to ignore most of them by checking for
                         # callability.
                         if '_repr_pretty_' in cls.__dict__:
                             meth = cls._repr_pretty_
                             if callable(meth):
                                 return meth(obj, self, cycle)
                         if cls is not object \
                                 and callable(cls.__dict__.get('__repr__')):
                             return _repr_pprint(obj, self, cycle)
 
             return _default_pprint(obj, self, cycle)
         finally:
             self.end_group()
             self.stack.pop()
 
     def _in_deferred_types(self, cls):
         """
         Check if the given class is specified in the deferred type registry.
 
         Returns the printer from the registry if it exists, and None if the
         class is not in the registry. Successful matches will be moved to the
         regular type registry for future use.
         """
         mod = _safe_getattr(cls, '__module__', None)
         name = _safe_getattr(cls, '__name__', None)
         key = (mod, name)
         printer = None
         if key in self.deferred_pprinters:
             # Move the printer over to the regular registry.
             printer = self.deferred_pprinters.pop(key)
             self.type_pprinters[cls] = printer
         return printer
 
 
 class Printable(object):
 
     def output(self, stream, output_width):
         return output_width
 
 
 class Text(Printable):
 
     def __init__(self):
         self.objs = []
         self.width = 0
 
     def output(self, stream, output_width):
         for obj in self.objs:
             stream.write(obj)
         return output_width + self.width
 
     def add(self, obj, width):
         self.objs.append(obj)
         self.width += width
 
 
 class Breakable(Printable):
 
     def __init__(self, seq, width, pretty):
         self.obj = seq
         self.width = width
         self.pretty = pretty
         self.indentation = pretty.indentation
         self.group = pretty.group_stack[-1]
         self.group.breakables.append(self)
 
     def output(self, stream, output_width):
         self.group.breakables.popleft()
         if self.group.want_break:
             stream.write(self.pretty.newline)
             stream.write(' ' * self.indentation)
             return self.indentation
         if not self.group.breakables:
             self.pretty.group_queue.remove(self.group)
         stream.write(self.obj)
         return output_width + self.width
 
 
 class Group(Printable):
 
     def __init__(self, depth):
         self.depth = depth
         self.breakables = deque()
         self.want_break = False
 
 
 class GroupQueue(object):
 
     def __init__(self, *groups):
         self.queue = []
         for group in groups:
             self.enq(group)
 
     def enq(self, group):
         depth = group.depth
         while depth > len(self.queue) - 1:
             self.queue.append([])
         self.queue[depth].append(group)
 
     def deq(self):
         for stack in self.queue:
             for idx, group in enumerate(reversed(stack)):
                 if group.breakables:
                     del stack[idx]
                     group.want_break = True
                     return group
             for group in stack:
                 group.want_break = True
             del stack[:]
 
     def remove(self, group):
         try:
             self.queue[group.depth].remove(group)
         except ValueError:
             pass
 
 
 class RawText:
     """ Object such that ``p.pretty(RawText(value))`` is the same as ``p.text(value)``.
 
     An example usage of this would be to show a list as binary numbers, using
     ``p.pretty([RawText(bin(i)) for i in integers])``.
     """
     def __init__(self, value):
         self.value = value
 
     def _repr_pretty_(self, p, cycle):
         p.text(self.value)
 
 
 class CallExpression:
     """ Object which emits a line-wrapped call expression in the form `__name(*args, **kwargs)` """
     def __init__(__self, __name, *args, **kwargs):
         # dunders are to avoid clashes with kwargs, as python's name manging
         # will kick in.
         self = __self
         self.name = __name
         self.args = args
         self.kwargs = kwargs
 
     @classmethod
     def factory(cls, name):
         def inner(*args, **kwargs):
             return cls(name, *args, **kwargs)
         return inner
 
     def _repr_pretty_(self, p, cycle):
         # dunders are to avoid clashes with kwargs, as python's name manging
         # will kick in.
 
         started = False
         def new_item():
             nonlocal started
             if started:
                 p.text(",")
                 p.breakable()
             started = True
 
         prefix = self.name + "("
         with p.group(len(prefix), prefix, ")"):
             for arg in self.args:
                 new_item()
                 p.pretty(arg)
             for arg_name, arg in self.kwargs.items():
                 new_item()
                 arg_prefix = arg_name + "="
                 with p.group(len(arg_prefix), arg_prefix):
                     p.pretty(arg)
 
 
 class RawStringLiteral:
     """ Wrapper that shows a string with a `r` prefix """
     def __init__(self, value):
         self.value = value
 
     def _repr_pretty_(self, p, cycle):
         base_repr = repr(self.value)
         if base_repr[:1] in 'uU':
             base_repr = base_repr[1:]
             prefix = 'ur'
         else:
             prefix = 'r'
         base_repr = prefix + base_repr.replace('\\\\', '\\')
         p.text(base_repr)
 
 
 def _default_pprint(obj, p, cycle):
     """
     The default print function.  Used if an object does not provide one and
     it's none of the builtin objects.
     """
     klass = _safe_getattr(obj, '__class__', None) or type(obj)
     if _safe_getattr(klass, '__repr__', None) is not object.__repr__:
         # A user-provided repr. Find newlines and replace them with p.break_()
         _repr_pprint(obj, p, cycle)
         return
     p.begin_group(1, '<')
     p.pretty(klass)
     p.text(' at 0x%x' % id(obj))
     if cycle:
         p.text(' ...')
     elif p.verbose:
         first = True
         for key in dir(obj):
             if not key.startswith('_'):
                 try:
                     value = getattr(obj, key)
                 except AttributeError:
                     continue
                 if isinstance(value, types.MethodType):
                     continue
                 if not first:
                     p.text(',')
                 p.breakable()
                 p.text(key)
                 p.text('=')
                 step = len(key) + 1
                 p.indentation += step
                 p.pretty(value)
                 p.indentation -= step
                 first = False
     p.end_group(1, '>')
 
 
 def _seq_pprinter_factory(start, end):
     """
     Factory that returns a pprint function useful for sequences.  Used by
     the default pprint for tuples and lists.
     """
     def inner(obj, p, cycle):
         if cycle:
             return p.text(start + '...' + end)
         step = len(start)
         p.begin_group(step, start)
         for idx, x in p._enumerate(obj):
             if idx:
                 p.text(',')
                 p.breakable()
             p.pretty(x)
         if len(obj) == 1 and isinstance(obj, tuple):
             # Special case for 1-item tuples.
             p.text(',')
         p.end_group(step, end)
     return inner
 
 
 def _set_pprinter_factory(start, end):
     """
     Factory that returns a pprint function useful for sets and frozensets.
     """
     def inner(obj, p, cycle):
         if cycle:
             return p.text(start + '...' + end)
         if len(obj) == 0:
             # Special case.
             p.text(type(obj).__name__ + '()')
         else:
             step = len(start)
             p.begin_group(step, start)
             # Like dictionary keys, we will try to sort the items if there aren't too many
             if not (p.max_seq_length and len(obj) >= p.max_seq_length):
                 items = _sorted_for_pprint(obj)
             else:
                 items = obj
             for idx, x in p._enumerate(items):
                 if idx:
                     p.text(',')
                     p.breakable()
                 p.pretty(x)
             p.end_group(step, end)
     return inner
 
 
 def _dict_pprinter_factory(start, end):
     """
     Factory that returns a pprint function used by the default pprint of
     dicts and dict proxies.
     """
     def inner(obj, p, cycle):
         if cycle:
             return p.text('{...}')
         step = len(start)
         p.begin_group(step, start)
         keys = obj.keys()
         for idx, key in p._enumerate(keys):
             if idx:
                 p.text(',')
                 p.breakable()
             p.pretty(key)
             p.text(': ')
             p.pretty(obj[key])
         p.end_group(step, end)
     return inner
 
 
 def _super_pprint(obj, p, cycle):
     """The pprint for the super type."""
     p.begin_group(8, '<super: ')
     p.pretty(obj.__thisclass__)
     p.text(',')
     p.breakable()
     if PYPY: # In PyPy, super() objects don't have __self__ attributes
         dself = obj.__repr__.__self__
         p.pretty(None if dself is obj else dself)
     else:
         p.pretty(obj.__self__)
     p.end_group(8, '>')
 
 
 
 class _ReFlags:
     def __init__(self, value):
         self.value = value
 
     def _repr_pretty_(self, p, cycle):
         done_one = False
         for flag in ('TEMPLATE', 'IGNORECASE', 'LOCALE', 'MULTILINE', 'DOTALL',
             'UNICODE', 'VERBOSE', 'DEBUG'):
             if self.value & getattr(re, flag):
                 if done_one:
                     p.text('|')
                 p.text('re.' + flag)
                 done_one = True
 
 
 def _re_pattern_pprint(obj, p, cycle):
     """The pprint function for regular expression patterns."""
     re_compile = CallExpression.factory('re.compile')
     if obj.flags:
         p.pretty(re_compile(RawStringLiteral(obj.pattern), _ReFlags(obj.flags)))
     else:
         p.pretty(re_compile(RawStringLiteral(obj.pattern)))
 
 
 def _types_simplenamespace_pprint(obj, p, cycle):
     """The pprint function for types.SimpleNamespace."""
     namespace = CallExpression.factory('namespace')
     if cycle:
         p.pretty(namespace(RawText("...")))
     else:
         p.pretty(namespace(**obj.__dict__))
 
 
 def _type_pprint(obj, p, cycle):
     """The pprint for classes and types."""
     # Heap allocated types might not have the module attribute,
     # and others may set it to None.
 
     # Checks for a __repr__ override in the metaclass. Can't compare the
     # type(obj).__repr__ directly because in PyPy the representation function
     # inherited from type isn't the same type.__repr__
     if [m for m in _get_mro(type(obj)) if "__repr__" in vars(m)][:1] != [type]:
         _repr_pprint(obj, p, cycle)
         return
 
     mod = _safe_getattr(obj, '__module__', None)
     try:
         name = obj.__qualname__
         if not isinstance(name, str):
             # This can happen if the type implements __qualname__ as a property
             # or other descriptor in Python 2.
             raise Exception("Try __name__")
     except Exception:
         name = obj.__name__
         if not isinstance(name, str):
             name = '<unknown type>'
 
     if mod in (None, '__builtin__', 'builtins', 'exceptions'):
         p.text(name)
     else:
         p.text(mod + '.' + name)
 
 
 def _repr_pprint(obj, p, cycle):
     """A pprint that just redirects to the normal repr function."""
     # Find newlines and replace them with p.break_()
     output = repr(obj)
     lines = output.splitlines()
     with p.group():
         for idx, output_line in enumerate(lines):
             if idx:
                 p.break_()
             p.text(output_line)
 
 
 def _function_pprint(obj, p, cycle):
     """Base pprint for all functions and builtin functions."""
     name = _safe_getattr(obj, '__qualname__', obj.__name__)
     mod = obj.__module__
     if mod and mod not in ('__builtin__', 'builtins', 'exceptions'):
         name = mod + '.' + name
     try:
        func_def = name + str(signature(obj))
     except ValueError:
        func_def = name
     p.text('<function %s>' % func_def)
 
 
 def _exception_pprint(obj, p, cycle):
     """Base pprint for all exceptions."""
     name = getattr(obj.__class__, '__qualname__', obj.__class__.__name__)
     if obj.__class__.__module__ not in ('exceptions', 'builtins'):
         name = '%s.%s' % (obj.__class__.__module__, name)
 
     p.pretty(CallExpression(name, *getattr(obj, 'args', ())))
 
 
 #: the exception base
 try:
     _exception_base = BaseException
 except NameError:
     _exception_base = Exception
 
 
 #: printers for builtin types
 _type_pprinters = {
     int:                        _repr_pprint,
     float:                      _repr_pprint,
     str:                        _repr_pprint,
     tuple:                      _seq_pprinter_factory('(', ')'),
     list:                       _seq_pprinter_factory('[', ']'),
     dict:                       _dict_pprinter_factory('{', '}'),
     set:                        _set_pprinter_factory('{', '}'),
     frozenset:                  _set_pprinter_factory('frozenset({', '})'),
     super:                      _super_pprint,
     _re_pattern_type:           _re_pattern_pprint,
     type:                       _type_pprint,
     types.FunctionType:         _function_pprint,
     types.BuiltinFunctionType:  _function_pprint,
     types.MethodType:           _repr_pprint,
     types.SimpleNamespace:      _types_simplenamespace_pprint,
     datetime.datetime:          _repr_pprint,
     datetime.timedelta:         _repr_pprint,
     _exception_base:            _exception_pprint
 }
 
 # render os.environ like a dict
 _env_type = type(os.environ)
 # future-proof in case os.environ becomes a plain dict?
 if _env_type is not dict:
     _type_pprinters[_env_type] = _dict_pprinter_factory('environ{', '}')
 
 try:
     # In PyPy, types.DictProxyType is dict, setting the dictproxy printer
     # using dict.setdefault avoids overwriting the dict printer
     _type_pprinters.setdefault(types.DictProxyType,
                                _dict_pprinter_factory('dict_proxy({', '})'))
     _type_pprinters[types.ClassType] = _type_pprint
     _type_pprinters[types.SliceType] = _repr_pprint
 except AttributeError: # Python 3
     _type_pprinters[types.MappingProxyType] = \
         _dict_pprinter_factory('mappingproxy({', '})')
     _type_pprinters[slice] = _repr_pprint
 
 _type_pprinters[range] = _repr_pprint
 _type_pprinters[bytes] = _repr_pprint
 
 #: printers for types specified by name
 _deferred_type_pprinters = {
 }
 
 def for_type(typ, func):
     """
     Add a pretty printer for a given type.
     """
     oldfunc = _type_pprinters.get(typ, None)
     if func is not None:
         # To support easy restoration of old pprinters, we need to ignore Nones.
         _type_pprinters[typ] = func
     return oldfunc
 
 def for_type_by_name(type_module, type_name, func):
     """
     Add a pretty printer for a type specified by the module and name of a type
     rather than the type object itself.
     """
     key = (type_module, type_name)
     oldfunc = _deferred_type_pprinters.get(key, None)
     if func is not None:
         # To support easy restoration of old pprinters, we need to ignore Nones.
         _deferred_type_pprinters[key] = func
     return oldfunc
 
 
 #: printers for the default singletons
 _singleton_pprinters = dict.fromkeys(map(id, [None, True, False, Ellipsis,
                                       NotImplemented]), _repr_pprint)
 
 
 def _defaultdict_pprint(obj, p, cycle):
     cls_ctor = CallExpression.factory(obj.__class__.__name__)
     if cycle:
         p.pretty(cls_ctor(RawText("...")))
     else:
         p.pretty(cls_ctor(obj.default_factory, dict(obj)))
 
 def _ordereddict_pprint(obj, p, cycle):
     cls_ctor = CallExpression.factory(obj.__class__.__name__)
     if cycle:
         p.pretty(cls_ctor(RawText("...")))
     elif len(obj):
         p.pretty(cls_ctor(list(obj.items())))
     else:
         p.pretty(cls_ctor())
 
 def _deque_pprint(obj, p, cycle):
     cls_ctor = CallExpression.factory(obj.__class__.__name__)
     if cycle:
         p.pretty(cls_ctor(RawText("...")))
+    elif obj.maxlen is not None:
+        p.pretty(cls_ctor(list(obj), maxlen=obj.maxlen))
     else:
         p.pretty(cls_ctor(list(obj)))
 
 def _counter_pprint(obj, p, cycle):
     cls_ctor = CallExpression.factory(obj.__class__.__name__)
     if cycle:
         p.pretty(cls_ctor(RawText("...")))
     elif len(obj):
         p.pretty(cls_ctor(dict(obj)))
     else:
         p.pretty(cls_ctor())
 
 
 def _userlist_pprint(obj, p, cycle):
     cls_ctor = CallExpression.factory(obj.__class__.__name__)
     if cycle:
         p.pretty(cls_ctor(RawText("...")))
     else:
         p.pretty(cls_ctor(obj.data))
 
 
 for_type_by_name('collections', 'defaultdict', _defaultdict_pprint)
 for_type_by_name('collections', 'OrderedDict', _ordereddict_pprint)
 for_type_by_name('collections', 'deque', _deque_pprint)
 for_type_by_name('collections', 'Counter', _counter_pprint)
 for_type_by_name("collections", "UserList", _userlist_pprint)
 
 if __name__ == '__main__':
     from random import randrange
     class Foo(object):
         def __init__(self):
             self.foo = 1
             self.bar = re.compile(r'\s+')
             self.blub = dict.fromkeys(range(30), randrange(1, 40))
             self.hehe = 23424.234234
             self.list = ["blub", "blah", self]
 
         def get_foo(self):
             print("foo")
 
     pprint(Foo(), verbose=True)

IPython/lib/tests/test_clipboard.py

@@ -1,19 +1,20 b''
 from IPython.core.error import TryNext
 from IPython.lib.clipboard import ClipboardEmpty
 from IPython.testing.decorators import skip_if_no_x11
 
+
 @skip_if_no_x11
 def test_clipboard_get():
     # Smoketest for clipboard access - we can't easily guarantee that the
     # clipboard is accessible and has something on it, but this tries to
     # exercise the relevant code anyway.
     try:
         a = get_ipython().hooks.clipboard_get()
     except ClipboardEmpty:
         # Nothing in clipboard to get
         pass
     except TryNext:
         # No clipboard access API available
         pass
     else:
         assert isinstance(a, str)

IPython/terminal/interactiveshell.py

@@ -1,769 +1,774 b''
 """IPython terminal interface using prompt_toolkit"""
 
 import asyncio
 import os
 import sys
 from warnings import warn
 
 from IPython.core.async_helpers import get_asyncio_loop
 from IPython.core.interactiveshell import InteractiveShell, InteractiveShellABC
 from IPython.utils.py3compat import input
 from IPython.utils.terminal import toggle_set_term_title, set_term_title, restore_term_title
 from IPython.utils.process import abbrev_cwd
 from traitlets import (
     Bool,
     Unicode,
     Dict,
     Integer,
     observe,
     Instance,
     Type,
     default,
     Enum,
     Union,
     Any,
     validate,
     Float,
 )
 
 from prompt_toolkit.auto_suggest import AutoSuggestFromHistory
 from prompt_toolkit.enums import DEFAULT_BUFFER, EditingMode
 from prompt_toolkit.filters import (HasFocus, Condition, IsDone)
 from prompt_toolkit.formatted_text import PygmentsTokens
 from prompt_toolkit.history import History
 from prompt_toolkit.layout.processors import ConditionalProcessor, HighlightMatchingBracketProcessor
 from prompt_toolkit.output import ColorDepth
 from prompt_toolkit.patch_stdout import patch_stdout
 from prompt_toolkit.shortcuts import PromptSession, CompleteStyle, print_formatted_text
 from prompt_toolkit.styles import DynamicStyle, merge_styles
 from prompt_toolkit.styles.pygments import style_from_pygments_cls, style_from_pygments_dict
 from prompt_toolkit import __version__ as ptk_version
 
 from pygments.styles import get_style_by_name
 from pygments.style import Style
 from pygments.token import Token
 
 from .debugger import TerminalPdb, Pdb
 from .magics import TerminalMagics
 from .pt_inputhooks import get_inputhook_name_and_func
 from .prompts import Prompts, ClassicPrompts, RichPromptDisplayHook
 from .ptutils import IPythonPTCompleter, IPythonPTLexer
 from .shortcuts import create_ipython_shortcuts
 
 PTK3 = ptk_version.startswith('3.')
 
 
 class _NoStyle(Style): pass
 
 
 
 _style_overrides_light_bg = {
             Token.Prompt: '#ansibrightblue',
             Token.PromptNum: '#ansiblue bold',
             Token.OutPrompt: '#ansibrightred',
             Token.OutPromptNum: '#ansired bold',
 }
 
 _style_overrides_linux = {
             Token.Prompt: '#ansibrightgreen',
             Token.PromptNum: '#ansigreen bold',
             Token.OutPrompt: '#ansibrightred',
             Token.OutPromptNum: '#ansired bold',
 }
 
 def get_default_editor():
     try:
         return os.environ['EDITOR']
     except KeyError:
         pass
     except UnicodeError:
         warn("$EDITOR environment variable is not pure ASCII. Using platform "
              "default editor.")
 
     if os.name == 'posix':
         return 'vi'  # the only one guaranteed to be there!
     else:
         return 'notepad' # same in Windows!
 
 # conservatively check for tty
 # overridden streams can result in things like:
 # - sys.stdin = None
 # - no isatty method
 for _name in ('stdin', 'stdout', 'stderr'):
     _stream = getattr(sys, _name)
-    if not _stream or not hasattr(_stream, 'isatty') or not _stream.isatty():
+    try:
+        if not _stream or not hasattr(_stream, "isatty") or not _stream.isatty():
+            _is_tty = False
+            break
+    except ValueError:
+        # stream is closed
         _is_tty = False
         break
 else:
     _is_tty = True
 
 
 _use_simple_prompt = ('IPY_TEST_SIMPLE_PROMPT' in os.environ) or (not _is_tty)
 
 def black_reformat_handler(text_before_cursor):
     """
     We do not need to protect against error,
     this is taken care at a higher level where any reformat error is ignored.
     Indeed we may call reformatting on incomplete code.
     """
     import black
 
     formatted_text = black.format_str(text_before_cursor, mode=black.FileMode())
     if not text_before_cursor.endswith("\n") and formatted_text.endswith("\n"):
         formatted_text = formatted_text[:-1]
     return formatted_text
 
 
 def yapf_reformat_handler(text_before_cursor):
     from yapf.yapflib import file_resources
     from yapf.yapflib import yapf_api
 
     style_config = file_resources.GetDefaultStyleForDir(os.getcwd())
     formatted_text, was_formatted = yapf_api.FormatCode(
         text_before_cursor, style_config=style_config
     )
     if was_formatted:
         if not text_before_cursor.endswith("\n") and formatted_text.endswith("\n"):
             formatted_text = formatted_text[:-1]
         return formatted_text
     else:
         return text_before_cursor
 
 
 class PtkHistoryAdapter(History):
     """
     Prompt toolkit has it's own way of handling history, Where it assumes it can
     Push/pull from history.
 
     """
 
     def __init__(self, shell):
         super().__init__()
         self.shell = shell
         self._refresh()
 
     def append_string(self, string):
         # we rely on sql for that.
         self._loaded = False
         self._refresh()
 
     def _refresh(self):
         if not self._loaded:
             self._loaded_strings = list(self.load_history_strings())
 
     def load_history_strings(self):
         last_cell = ""
         res = []
         for __, ___, cell in self.shell.history_manager.get_tail(
             self.shell.history_load_length, include_latest=True
         ):
             # Ignore blank lines and consecutive duplicates
             cell = cell.rstrip()
             if cell and (cell != last_cell):
                 res.append(cell)
                 last_cell = cell
         yield from res[::-1]
 
     def store_string(self, string: str) -> None:
         pass
 
 class TerminalInteractiveShell(InteractiveShell):
     mime_renderers = Dict().tag(config=True)
 
     space_for_menu = Integer(6, help='Number of line at the bottom of the screen '
                                      'to reserve for the tab completion menu, '
                                      'search history, ...etc, the height of '
                                      'these menus will at most this value. '
                                      'Increase it is you prefer long and skinny '
                                      'menus, decrease for short and wide.'
                             ).tag(config=True)
 
     pt_app = None
     debugger_history = None
 
     debugger_history_file = Unicode(
         "~/.pdbhistory", help="File in which to store and read history"
     ).tag(config=True)
 
     simple_prompt = Bool(_use_simple_prompt,
         help="""Use `raw_input` for the REPL, without completion and prompt colors.
 
             Useful when controlling IPython as a subprocess, and piping STDIN/OUT/ERR. Known usage are:
             IPython own testing machinery, and emacs inferior-shell integration through elpy.
 
             This mode default to `True` if the `IPY_TEST_SIMPLE_PROMPT`
             environment variable is set, or the current terminal is not a tty."""
             ).tag(config=True)
 
     @property
     def debugger_cls(self):
         return Pdb if self.simple_prompt else TerminalPdb
 
     confirm_exit = Bool(True,
         help="""
         Set to confirm when you try to exit IPython with an EOF (Control-D
         in Unix, Control-Z/Enter in Windows). By typing 'exit' or 'quit',
         you can force a direct exit without any confirmation.""",
     ).tag(config=True)
 
     editing_mode = Unicode('emacs',
         help="Shortcut style to use at the prompt. 'vi' or 'emacs'.",
     ).tag(config=True)
 
     emacs_bindings_in_vi_insert_mode = Bool(
         True,
         help="Add shortcuts from 'emacs' insert mode to 'vi' insert mode.",
     ).tag(config=True)
 
     modal_cursor = Bool(
         True,
         help="""
        Cursor shape changes depending on vi mode: beam in vi insert mode,
        block in nav mode, underscore in replace mode.""",
     ).tag(config=True)
 
     ttimeoutlen = Float(
         0.01,
         help="""The time in milliseconds that is waited for a key code
        to complete.""",
     ).tag(config=True)
 
     timeoutlen = Float(
         0.5,
         help="""The time in milliseconds that is waited for a mapped key
        sequence to complete.""",
     ).tag(config=True)
 
     autoformatter = Unicode(
         None,
         help="Autoformatter to reformat Terminal code. Can be `'black'`, `'yapf'` or `None`",
         allow_none=True
     ).tag(config=True)
 
     auto_match = Bool(
         False,
         help="""
         Automatically add/delete closing bracket or quote when opening bracket or quote is entered/deleted.
         Brackets: (), [], {}
         Quotes: '', \"\"
         """,
     ).tag(config=True)
 
     mouse_support = Bool(False,
         help="Enable mouse support in the prompt\n(Note: prevents selecting text with the mouse)"
     ).tag(config=True)
 
     # We don't load the list of styles for the help string, because loading
     # Pygments plugins takes time and can cause unexpected errors.
     highlighting_style = Union([Unicode('legacy'), Type(klass=Style)],
         help="""The name or class of a Pygments style to use for syntax
         highlighting. To see available styles, run `pygmentize -L styles`."""
     ).tag(config=True)
 
     @validate('editing_mode')
     def _validate_editing_mode(self, proposal):
         if proposal['value'].lower() == 'vim':
             proposal['value']= 'vi'
         elif proposal['value'].lower() == 'default':
             proposal['value']= 'emacs'
 
         if hasattr(EditingMode, proposal['value'].upper()):
             return proposal['value'].lower()
 
         return self.editing_mode
 
 
     @observe('editing_mode')
     def _editing_mode(self, change):
         if self.pt_app:
             self.pt_app.editing_mode = getattr(EditingMode, change.new.upper())
 
     def _set_formatter(self, formatter):
         if formatter is None:
             self.reformat_handler = lambda x:x
         elif formatter == 'black':
             self.reformat_handler = black_reformat_handler
         elif formatter == "yapf":
             self.reformat_handler = yapf_reformat_handler
         else:
             raise ValueError
 
     @observe("autoformatter")
     def _autoformatter_changed(self, change):
         formatter = change.new
         self._set_formatter(formatter)
 
     @observe('highlighting_style')
     @observe('colors')
     def _highlighting_style_changed(self, change):
         self.refresh_style()
 
     def refresh_style(self):
         self._style = self._make_style_from_name_or_cls(self.highlighting_style)
 
 
     highlighting_style_overrides = Dict(
         help="Override highlighting format for specific tokens"
     ).tag(config=True)
 
     true_color = Bool(False,
         help="""Use 24bit colors instead of 256 colors in prompt highlighting.
         If your terminal supports true color, the following command should
         print ``TRUECOLOR`` in orange::
 
             printf \"\\x1b[38;2;255;100;0mTRUECOLOR\\x1b[0m\\n\"
         """,
     ).tag(config=True)
 
     editor = Unicode(get_default_editor(),
         help="Set the editor used by IPython (default to $EDITOR/vi/notepad)."
     ).tag(config=True)
 
     prompts_class = Type(Prompts, help='Class used to generate Prompt token for prompt_toolkit').tag(config=True)
 
     prompts = Instance(Prompts)
 
     @default('prompts')
     def _prompts_default(self):
         return self.prompts_class(self)
 
 #    @observe('prompts')
 #    def _(self, change):
 #        self._update_layout()
 
     @default('displayhook_class')
     def _displayhook_class_default(self):
         return RichPromptDisplayHook
 
     term_title = Bool(True,
         help="Automatically set the terminal title"
     ).tag(config=True)
 
     term_title_format = Unicode("IPython: {cwd}",
         help="Customize the terminal title format.  This is a python format string. " +
              "Available substitutions are: {cwd}."
     ).tag(config=True)
 
     display_completions = Enum(('column', 'multicolumn','readlinelike'),
         help= ( "Options for displaying tab completions, 'column', 'multicolumn', and "
                 "'readlinelike'. These options are for `prompt_toolkit`, see "
                 "`prompt_toolkit` documentation for more information."
                 ),
         default_value='multicolumn').tag(config=True)
 
     highlight_matching_brackets = Bool(True,
         help="Highlight matching brackets.",
     ).tag(config=True)
 
     extra_open_editor_shortcuts = Bool(False,
         help="Enable vi (v) or Emacs (C-X C-E) shortcuts to open an external editor. "
              "This is in addition to the F2 binding, which is always enabled."
     ).tag(config=True)
 
     handle_return = Any(None,
         help="Provide an alternative handler to be called when the user presses "
              "Return. This is an advanced option intended for debugging, which "
              "may be changed or removed in later releases."
     ).tag(config=True)
 
     enable_history_search = Bool(True,
         help="Allows to enable/disable the prompt toolkit history search"
     ).tag(config=True)
 
     autosuggestions_provider = Unicode(
         "AutoSuggestFromHistory",
         help="Specifies from which source automatic suggestions are provided. "
         "Can be set to `'AutoSuggestFromHistory`' or `None` to disable"
         "automatic suggestions. Default is `'AutoSuggestFromHistory`'.",
         allow_none=True,
     ).tag(config=True)
 
     def _set_autosuggestions(self, provider):
         if provider is None:
             self.auto_suggest = None
         elif provider == "AutoSuggestFromHistory":
             self.auto_suggest = AutoSuggestFromHistory()
         else:
             raise ValueError("No valid provider.")
         if self.pt_app:
             self.pt_app.auto_suggest = self.auto_suggest
 
     @observe("autosuggestions_provider")
     def _autosuggestions_provider_changed(self, change):
         provider = change.new
         self._set_autosuggestions(provider)
 
     prompt_includes_vi_mode = Bool(True,
         help="Display the current vi mode (when using vi editing mode)."
     ).tag(config=True)
 
     @observe('term_title')
     def init_term_title(self, change=None):
         # Enable or disable the terminal title.
         if self.term_title:
             toggle_set_term_title(True)
             set_term_title(self.term_title_format.format(cwd=abbrev_cwd()))
         else:
             toggle_set_term_title(False)
 
     def restore_term_title(self):
         if self.term_title:
             restore_term_title()
 
     def init_display_formatter(self):
         super(TerminalInteractiveShell, self).init_display_formatter()
         # terminal only supports plain text
         self.display_formatter.active_types = ["text/plain"]
 
     def init_prompt_toolkit_cli(self):
         if self.simple_prompt:
             # Fall back to plain non-interactive output for tests.
             # This is very limited.
             def prompt():
                 prompt_text = "".join(x[1] for x in self.prompts.in_prompt_tokens())
                 lines = [input(prompt_text)]
                 prompt_continuation = "".join(x[1] for x in self.prompts.continuation_prompt_tokens())
                 while self.check_complete('\n'.join(lines))[0] == 'incomplete':
                     lines.append( input(prompt_continuation) )
                 return '\n'.join(lines)
             self.prompt_for_code = prompt
             return
 
         # Set up keyboard shortcuts
         key_bindings = create_ipython_shortcuts(self)
 
 
         # Pre-populate history from IPython's history database
         history = PtkHistoryAdapter(self)
 
         self._style = self._make_style_from_name_or_cls(self.highlighting_style)
         self.style = DynamicStyle(lambda: self._style)
 
         editing_mode = getattr(EditingMode, self.editing_mode.upper())
 
         self.pt_loop = asyncio.new_event_loop()
         self.pt_app = PromptSession(
             auto_suggest=self.auto_suggest,
             editing_mode=editing_mode,
             key_bindings=key_bindings,
             history=history,
             completer=IPythonPTCompleter(shell=self),
             enable_history_search=self.enable_history_search,
             style=self.style,
             include_default_pygments_style=False,
             mouse_support=self.mouse_support,
             enable_open_in_editor=self.extra_open_editor_shortcuts,
             color_depth=self.color_depth,
             tempfile_suffix=".py",
             **self._extra_prompt_options()
         )
 
     def _make_style_from_name_or_cls(self, name_or_cls):
         """
         Small wrapper that make an IPython compatible style from a style name
 
         We need that to add style for prompt ... etc.
         """
         style_overrides = {}
         if name_or_cls == 'legacy':
             legacy = self.colors.lower()
             if legacy == 'linux':
                 style_cls = get_style_by_name('monokai')
                 style_overrides = _style_overrides_linux
             elif legacy == 'lightbg':
                 style_overrides = _style_overrides_light_bg
                 style_cls = get_style_by_name('pastie')
             elif legacy == 'neutral':
                 # The default theme needs to be visible on both a dark background
                 # and a light background, because we can't tell what the terminal
                 # looks like. These tweaks to the default theme help with that.
                 style_cls = get_style_by_name('default')
                 style_overrides.update({
                     Token.Number: '#ansigreen',
                     Token.Operator: 'noinherit',
                     Token.String: '#ansiyellow',
                     Token.Name.Function: '#ansiblue',
                     Token.Name.Class: 'bold #ansiblue',
                     Token.Name.Namespace: 'bold #ansiblue',
                     Token.Name.Variable.Magic: '#ansiblue',
                     Token.Prompt: '#ansigreen',
                     Token.PromptNum: '#ansibrightgreen bold',
                     Token.OutPrompt: '#ansired',
                     Token.OutPromptNum: '#ansibrightred bold',
                 })
 
                 # Hack: Due to limited color support on the Windows console
                 # the prompt colors will be wrong without this
                 if os.name == 'nt':
                     style_overrides.update({
                         Token.Prompt: '#ansidarkgreen',
                         Token.PromptNum: '#ansigreen bold',
                         Token.OutPrompt: '#ansidarkred',
                         Token.OutPromptNum: '#ansired bold',
                     })
             elif legacy =='nocolor':
                 style_cls=_NoStyle
                 style_overrides = {}
             else :
                 raise ValueError('Got unknown colors: ', legacy)
         else :
             if isinstance(name_or_cls, str):
                 style_cls = get_style_by_name(name_or_cls)
             else:
                 style_cls = name_or_cls
             style_overrides = {
                 Token.Prompt: '#ansigreen',
                 Token.PromptNum: '#ansibrightgreen bold',
                 Token.OutPrompt: '#ansired',
                 Token.OutPromptNum: '#ansibrightred bold',
             }
         style_overrides.update(self.highlighting_style_overrides)
         style = merge_styles([
             style_from_pygments_cls(style_cls),
             style_from_pygments_dict(style_overrides),
         ])
 
         return style
 
     @property
     def pt_complete_style(self):
         return {
             'multicolumn': CompleteStyle.MULTI_COLUMN,
             'column': CompleteStyle.COLUMN,
             'readlinelike': CompleteStyle.READLINE_LIKE,
         }[self.display_completions]
 
     @property
     def color_depth(self):
         return (ColorDepth.TRUE_COLOR if self.true_color else None)
 
     def _extra_prompt_options(self):
         """
         Return the current layout option for the current Terminal InteractiveShell
         """
         def get_message():
             return PygmentsTokens(self.prompts.in_prompt_tokens())
 
         if self.editing_mode == 'emacs':
             # with emacs mode the prompt is (usually) static, so we call only
             # the function once. With VI mode it can toggle between [ins] and
             # [nor] so we can't precompute.
             # here I'm going to favor the default keybinding which almost
             # everybody uses to decrease CPU usage.
             # if we have issues with users with custom Prompts we can see how to
             # work around this.
             get_message = get_message()
 
         options = {
                 'complete_in_thread': False,
                 'lexer':IPythonPTLexer(),
                 'reserve_space_for_menu':self.space_for_menu,
                 'message': get_message,
                 'prompt_continuation': (
                     lambda width, lineno, is_soft_wrap:
                         PygmentsTokens(self.prompts.continuation_prompt_tokens(width))),
                 'multiline': True,
                 'complete_style': self.pt_complete_style,
 
                 # Highlight matching brackets, but only when this setting is
                 # enabled, and only when the DEFAULT_BUFFER has the focus.
                 'input_processors': [ConditionalProcessor(
                         processor=HighlightMatchingBracketProcessor(chars='[](){}'),
                         filter=HasFocus(DEFAULT_BUFFER) & ~IsDone() &
                             Condition(lambda: self.highlight_matching_brackets))],
                 }
         if not PTK3:
             options['inputhook'] = self.inputhook
 
         return options
 
     def prompt_for_code(self):
         if self.rl_next_input:
             default = self.rl_next_input
             self.rl_next_input = None
         else:
             default = ''
 
         # In order to make sure that asyncio code written in the
         # interactive shell doesn't interfere with the prompt, we run the
         # prompt in a different event loop.
         # If we don't do this, people could spawn coroutine with a
         # while/true inside which will freeze the prompt.
 
         policy = asyncio.get_event_loop_policy()
         old_loop = get_asyncio_loop()
 
         # FIXME: prompt_toolkit is using the deprecated `asyncio.get_event_loop`
         # to get the current event loop.
         # This will probably be replaced by an attribute or input argument,
         # at which point we can stop calling the soon-to-be-deprecated `set_event_loop` here.
         if old_loop is not self.pt_loop:
             policy.set_event_loop(self.pt_loop)
         try:
             with patch_stdout(raw=True):
                 text = self.pt_app.prompt(
                     default=default,
                     **self._extra_prompt_options())
         finally:
             # Restore the original event loop.
             if old_loop is not None and old_loop is not self.pt_loop:
                 policy.set_event_loop(old_loop)
 
         return text
 
     def enable_win_unicode_console(self):
         # Since IPython 7.10 doesn't support python < 3.6 and PEP 528, Python uses the unicode APIs for the Windows
         # console by default, so WUC shouldn't be needed.
         warn("`enable_win_unicode_console` is deprecated since IPython 7.10, does not do anything and will be removed in the future",
              DeprecationWarning,
              stacklevel=2)
 
     def init_io(self):
         if sys.platform not in {'win32', 'cli'}:
             return
 
         import colorama
         colorama.init()
 
     def init_magics(self):
         super(TerminalInteractiveShell, self).init_magics()
         self.register_magics(TerminalMagics)
 
     def init_alias(self):
         # The parent class defines aliases that can be safely used with any
         # frontend.
         super(TerminalInteractiveShell, self).init_alias()
 
         # Now define aliases that only make sense on the terminal, because they
         # need direct access to the console in a way that we can't emulate in
         # GUI or web frontend
         if os.name == 'posix':
             for cmd in ('clear', 'more', 'less', 'man'):
                 self.alias_manager.soft_define_alias(cmd, cmd)
 
 
     def __init__(self, *args, **kwargs):
         super(TerminalInteractiveShell, self).__init__(*args, **kwargs)
         self._set_autosuggestions(self.autosuggestions_provider)
         self.init_prompt_toolkit_cli()
         self.init_term_title()
         self.keep_running = True
         self._set_formatter(self.autoformatter)
 
 
     def ask_exit(self):
         self.keep_running = False
 
     rl_next_input = None
 
     def interact(self):
         self.keep_running = True
         while self.keep_running:
             print(self.separate_in, end='')
 
             try:
                 code = self.prompt_for_code()
             except EOFError:
                 if (not self.confirm_exit) \
                         or self.ask_yes_no('Do you really want to exit ([y]/n)?','y','n'):
                     self.ask_exit()
 
             else:
                 if code:
                     self.run_cell(code, store_history=True)
 
     def mainloop(self):
         # An extra layer of protection in case someone mashing Ctrl-C breaks
         # out of our internal code.
         while True:
             try:
                 self.interact()
                 break
             except KeyboardInterrupt as e:
                 print("\n%s escaped interact()\n" % type(e).__name__)
             finally:
                 # An interrupt during the eventloop will mess up the
                 # internal state of the prompt_toolkit library.
                 # Stopping the eventloop fixes this, see
                 # https://github.com/ipython/ipython/pull/9867
                 if hasattr(self, '_eventloop'):
                     self._eventloop.stop()
 
                 self.restore_term_title()
 
         # try to call some at-exit operation optimistically as some things can't
         # be done during interpreter shutdown. this is technically inaccurate as
         # this make mainlool not re-callable, but that should be a rare if not
         # in existent use case.
 
         self._atexit_once()
 
 
     _inputhook = None
     def inputhook(self, context):
         if self._inputhook is not None:
             self._inputhook(context)
 
     active_eventloop = None
     def enable_gui(self, gui=None):
         if gui and (gui != 'inline') :
             self.active_eventloop, self._inputhook =\
                 get_inputhook_name_and_func(gui)
         else:
             self.active_eventloop = self._inputhook = None
 
         # For prompt_toolkit 3.0. We have to create an asyncio event loop with
         # this inputhook.
         if PTK3:
             import asyncio
             from prompt_toolkit.eventloop import new_eventloop_with_inputhook
 
             if gui == 'asyncio':
                 # When we integrate the asyncio event loop, run the UI in the
                 # same event loop as the rest of the code. don't use an actual
                 # input hook. (Asyncio is not made for nesting event loops.)
                 self.pt_loop = get_asyncio_loop()
 
             elif self._inputhook:
                 # If an inputhook was set, create a new asyncio event loop with
                 # this inputhook for the prompt.
                 self.pt_loop = new_eventloop_with_inputhook(self._inputhook)
             else:
                 # When there's no inputhook, run the prompt in a separate
                 # asyncio event loop.
                 self.pt_loop = asyncio.new_event_loop()
 
     # Run !system commands directly, not through pipes, so terminal programs
     # work correctly.
     system = InteractiveShell.system_raw
 
     def auto_rewrite_input(self, cmd):
         """Overridden from the parent class to use fancy rewriting prompt"""
         if not self.show_rewritten_input:
             return
 
         tokens = self.prompts.rewrite_prompt_tokens()
         if self.pt_app:
             print_formatted_text(PygmentsTokens(tokens), end='',
                                  style=self.pt_app.app.style)
             print(cmd)
         else:
             prompt = ''.join(s for t, s in tokens)
             print(prompt, cmd, sep='')
 
     _prompts_before = None
     def switch_doctest_mode(self, mode):
         """Switch prompts to classic for %doctest_mode"""
         if mode:
             self._prompts_before = self.prompts
             self.prompts = ClassicPrompts(self)
         elif self._prompts_before:
             self.prompts = self._prompts_before
             self._prompts_before = None
 #        self._update_layout()
 
 
 InteractiveShellABC.register(TerminalInteractiveShell)
 
 if __name__ == '__main__':
     TerminalInteractiveShell.instance().interact()

IPython/terminal/ptutils.py

@@ -1,197 +1,204 b''
 """prompt-toolkit utilities
 
 Everything in this module is a private API,
 not to be used outside IPython.
 """
 
 # Copyright (c) IPython Development Team.
 # Distributed under the terms of the Modified BSD License.
 
 import unicodedata
 from wcwidth import wcwidth
 
 from IPython.core.completer import (
     provisionalcompleter, cursor_to_position,
     _deduplicate_completions)
 from prompt_toolkit.completion import Completer, Completion
 from prompt_toolkit.lexers import Lexer
 from prompt_toolkit.lexers import PygmentsLexer
 from prompt_toolkit.patch_stdout import patch_stdout
 
 import pygments.lexers as pygments_lexers
 import os
 import sys
 import traceback
 
 _completion_sentinel = object()
 
 def _elide_point(string:str, *, min_elide=30)->str:
     """
     If a string is long enough, and has at least 3 dots,
     replace the middle part with ellipses.
 
     If a string naming a file is long enough, and has at least 3 slashes,
     replace the middle part with ellipses.
 
     If three consecutive dots, or two consecutive dots are encountered these are
     replaced by the equivalents HORIZONTAL ELLIPSIS or TWO DOT LEADER unicode
     equivalents
     """
     string = string.replace('...','\N{HORIZONTAL ELLIPSIS}')
     string = string.replace('..','\N{TWO DOT LEADER}')
     if len(string) < min_elide:
         return string
 
     object_parts = string.split('.')
     file_parts = string.split(os.sep)
     if file_parts[-1] == '':
         file_parts.pop()
 
     if len(object_parts) > 3:
-        return '{}.{}\N{HORIZONTAL ELLIPSIS}{}.{}'.format(object_parts[0], object_parts[1][0], object_parts[-2][-1], object_parts[-1])
+        return "{}.{}\N{HORIZONTAL ELLIPSIS}{}.{}".format(
+            object_parts[0],
+            object_parts[1][:1],
+            object_parts[-2][-1:],
+            object_parts[-1],
+        )
 
     elif len(file_parts) > 3:
-        return ('{}' + os.sep + '{}\N{HORIZONTAL ELLIPSIS}{}' + os.sep + '{}').format(file_parts[0], file_parts[1][0], file_parts[-2][-1], file_parts[-1])
+        return ("{}" + os.sep + "{}\N{HORIZONTAL ELLIPSIS}{}" + os.sep + "{}").format(
+            file_parts[0], file_parts[1][:1], file_parts[-2][-1:], file_parts[-1]
+        )
 
     return string
 
 def _elide_typed(string:str, typed:str, *, min_elide:int=30)->str:
     """
     Elide the middle of a long string if the beginning has already been typed.
     """
 
     if len(string) < min_elide:
         return string
     cut_how_much = len(typed)-3
     if cut_how_much < 7:
         return string
     if string.startswith(typed) and len(string)> len(typed):
         return f"{string[:3]}\N{HORIZONTAL ELLIPSIS}{string[cut_how_much:]}"
     return string
 
 def _elide(string:str, typed:str, min_elide=30)->str:
     return _elide_typed(
         _elide_point(string, min_elide=min_elide),
         typed, min_elide=min_elide)
 
 
 
 def _adjust_completion_text_based_on_context(text, body, offset):
     if text.endswith('=') and len(body) > offset and body[offset] == '=':
         return text[:-1]
     else:
         return text
 
 
 class IPythonPTCompleter(Completer):
     """Adaptor to provide IPython completions to prompt_toolkit"""
     def __init__(self, ipy_completer=None, shell=None):
         if shell is None and ipy_completer is None:
             raise TypeError("Please pass shell=an InteractiveShell instance.")
         self._ipy_completer = ipy_completer
         self.shell = shell
 
     @property
     def ipy_completer(self):
         if self._ipy_completer:
             return self._ipy_completer
         else:
             return self.shell.Completer
 
     def get_completions(self, document, complete_event):
         if not document.current_line.strip():
             return
         # Some bits of our completion system may print stuff (e.g. if a module
         # is imported). This context manager ensures that doesn't interfere with
         # the prompt.
 
         with patch_stdout(), provisionalcompleter():
             body = document.text
             cursor_row = document.cursor_position_row
             cursor_col = document.cursor_position_col
             cursor_position = document.cursor_position
             offset = cursor_to_position(body, cursor_row, cursor_col)
             try:
                 yield from self._get_completions(body, offset, cursor_position, self.ipy_completer)
             except Exception as e:
                 try:
                     exc_type, exc_value, exc_tb = sys.exc_info()
                     traceback.print_exception(exc_type, exc_value, exc_tb)
                 except AttributeError:
                     print('Unrecoverable Error in completions')
 
     @staticmethod
     def _get_completions(body, offset, cursor_position, ipyc):
         """
         Private equivalent of get_completions() use only for unit_testing.
         """
         debug = getattr(ipyc, 'debug', False)
         completions = _deduplicate_completions(
             body, ipyc.completions(body, offset))
         for c in completions:
             if not c.text:
                 # Guard against completion machinery giving us an empty string.
                 continue
             text = unicodedata.normalize('NFC', c.text)
             # When the first character of the completion has a zero length,
             # then it's probably a decomposed unicode character. E.g. caused by
             # the "\dot" completion. Try to compose again with the previous
             # character.
             if wcwidth(text[0]) == 0:
                 if cursor_position + c.start > 0:
                     char_before = body[c.start - 1]
                     fixed_text = unicodedata.normalize(
                         'NFC', char_before + text)
 
                     # Yield the modified completion instead, if this worked.
                     if wcwidth(text[0:1]) == 1:
                         yield Completion(fixed_text, start_position=c.start - offset - 1)
                         continue
 
             # TODO: Use Jedi to determine meta_text
             # (Jedi currently has a bug that results in incorrect information.)
             # meta_text = ''
             # yield Completion(m, start_position=start_pos,
             #                  display_meta=meta_text)
             display_text = c.text
 
             adjusted_text = _adjust_completion_text_based_on_context(c.text, body, offset)
             if c.type == 'function':
                 yield Completion(adjusted_text, start_position=c.start - offset, display=_elide(display_text+'()', body[c.start:c.end]), display_meta=c.type+c.signature)
             else:
                 yield Completion(adjusted_text, start_position=c.start - offset, display=_elide(display_text,  body[c.start:c.end]), display_meta=c.type)
 
 class IPythonPTLexer(Lexer):
     """
     Wrapper around PythonLexer and BashLexer.
     """
     def __init__(self):
         l = pygments_lexers
         self.python_lexer = PygmentsLexer(l.Python3Lexer)
         self.shell_lexer = PygmentsLexer(l.BashLexer)
 
         self.magic_lexers = {
             'HTML': PygmentsLexer(l.HtmlLexer),
             'html': PygmentsLexer(l.HtmlLexer),
             'javascript': PygmentsLexer(l.JavascriptLexer),
             'js': PygmentsLexer(l.JavascriptLexer),
             'perl': PygmentsLexer(l.PerlLexer),
             'ruby': PygmentsLexer(l.RubyLexer),
             'latex': PygmentsLexer(l.TexLexer),
         }
 
     def lex_document(self, document):
         text = document.text.lstrip()
 
         lexer = self.python_lexer
 
         if text.startswith('!') or text.startswith('%%bash'):
             lexer = self.shell_lexer
 
         elif text.startswith('%%'):
             for magic, l in self.magic_lexers.items():
                 if text.startswith('%%' + magic):
                     lexer = l
                     break
 
         return lexer.lex_document(document)

IPython/terminal/shortcuts.py

@@ -1,551 +1,585 b''
 """
 Module to define and register Terminal IPython shortcuts with
 :mod:`prompt_toolkit`
 """
 
 # Copyright (c) IPython Development Team.
 # Distributed under the terms of the Modified BSD License.
 
 import warnings
 import signal
 import sys
 import re
 import os
 from typing import Callable
 
 
 from prompt_toolkit.application.current import get_app
 from prompt_toolkit.enums import DEFAULT_BUFFER, SEARCH_BUFFER
 from prompt_toolkit.filters import (has_focus, has_selection, Condition,
     vi_insert_mode, emacs_insert_mode, has_completions, vi_mode)
 from prompt_toolkit.key_binding.bindings.completion import display_completions_like_readline
 from prompt_toolkit.key_binding import KeyBindings
 from prompt_toolkit.key_binding.bindings import named_commands as nc
 from prompt_toolkit.key_binding.vi_state import InputMode, ViState
 
 from IPython.utils.decorators import undoc
 
 @undoc
 @Condition
 def cursor_in_leading_ws():
     before = get_app().current_buffer.document.current_line_before_cursor
     return (not before) or before.isspace()
 
 
 # Needed for to accept autosuggestions in vi insert mode
 def _apply_autosuggest(event):
     """
     Apply autosuggestion if at end of line.
     """
     b = event.current_buffer
     d = b.document
     after_cursor = d.text[d.cursor_position :]
     lines = after_cursor.split("\n")
     end_of_current_line = lines[0].strip()
     suggestion = b.suggestion
     if (suggestion is not None) and (suggestion.text) and (end_of_current_line == ""):
         b.insert_text(suggestion.text)
     else:
         nc.end_of_line(event)
 
 def create_ipython_shortcuts(shell):
     """Set up the prompt_toolkit keyboard shortcuts for IPython"""
 
     kb = KeyBindings()
     insert_mode = vi_insert_mode | emacs_insert_mode
 
     if getattr(shell, 'handle_return', None):
         return_handler = shell.handle_return(shell)
     else:
         return_handler = newline_or_execute_outer(shell)
 
     kb.add('enter', filter=(has_focus(DEFAULT_BUFFER)
                             & ~has_selection
                             & insert_mode
                         ))(return_handler)
 
     def reformat_and_execute(event):
         reformat_text_before_cursor(event.current_buffer, event.current_buffer.document, shell)
         event.current_buffer.validate_and_handle()
 
     kb.add('escape', 'enter', filter=(has_focus(DEFAULT_BUFFER)
                             & ~has_selection
                             & insert_mode
                                       ))(reformat_and_execute)
 
     kb.add("c-\\")(quit)
 
     kb.add('c-p', filter=(vi_insert_mode & has_focus(DEFAULT_BUFFER))
                 )(previous_history_or_previous_completion)
 
     kb.add('c-n', filter=(vi_insert_mode & has_focus(DEFAULT_BUFFER))
                 )(next_history_or_next_completion)
 
     kb.add('c-g', filter=(has_focus(DEFAULT_BUFFER) & has_completions)
                 )(dismiss_completion)
 
     kb.add('c-c', filter=has_focus(DEFAULT_BUFFER))(reset_buffer)
 
     kb.add('c-c', filter=has_focus(SEARCH_BUFFER))(reset_search_buffer)
 
     supports_suspend = Condition(lambda: hasattr(signal, 'SIGTSTP'))
     kb.add('c-z', filter=supports_suspend)(suspend_to_bg)
 
     # Ctrl+I == Tab
     kb.add('tab', filter=(has_focus(DEFAULT_BUFFER)
                           & ~has_selection
                           & insert_mode
                           & cursor_in_leading_ws
                         ))(indent_buffer)
     kb.add('c-o', filter=(has_focus(DEFAULT_BUFFER) & emacs_insert_mode)
            )(newline_autoindent_outer(shell.input_transformer_manager))
 
     kb.add('f2', filter=has_focus(DEFAULT_BUFFER))(open_input_in_editor)
 
     @Condition
     def auto_match():
         return shell.auto_match
 
     focused_insert = (vi_insert_mode | emacs_insert_mode) & has_focus(DEFAULT_BUFFER)
     _preceding_text_cache = {}
     _following_text_cache = {}
 
     def preceding_text(pattern):
         try:
             return _preceding_text_cache[pattern]
         except KeyError:
             pass
         m = re.compile(pattern)
 
         def _preceding_text():
             app = get_app()
             return bool(m.match(app.current_buffer.document.current_line_before_cursor))
 
         condition = Condition(_preceding_text)
         _preceding_text_cache[pattern] = condition
         return condition
 
     def following_text(pattern):
         try:
             return _following_text_cache[pattern]
         except KeyError:
             pass
         m = re.compile(pattern)
 
         def _following_text():
             app = get_app()
             return bool(m.match(app.current_buffer.document.current_line_after_cursor))
 
         condition = Condition(_following_text)
         _following_text_cache[pattern] = condition
         return condition
 
+    @Condition
+    def not_inside_unclosed_string():
+        app = get_app()
+        s = app.current_buffer.document.text_before_cursor
+        # remove escaped quotes
+        s = s.replace('\\"', "").replace("\\'", "")
+        # remove triple-quoted string literals
+        s = re.sub(r"(?:\"\"\"[\s\S]*\"\"\"|'''[\s\S]*''')", "", s)
+        # remove single-quoted string literals
+        s = re.sub(r"""(?:"[^"]*["\n]|'[^']*['\n])""", "", s)
+        return not ('"' in s or "'" in s)
+
     # auto match
     @kb.add("(", filter=focused_insert & auto_match & following_text(r"[,)}\]]|$"))
     def _(event):
         event.current_buffer.insert_text("()")
         event.current_buffer.cursor_left()
 
     @kb.add("[", filter=focused_insert & auto_match & following_text(r"[,)}\]]|$"))
     def _(event):
         event.current_buffer.insert_text("[]")
         event.current_buffer.cursor_left()
 
     @kb.add("{", filter=focused_insert & auto_match & following_text(r"[,)}\]]|$"))
     def _(event):
         event.current_buffer.insert_text("{}")
         event.current_buffer.cursor_left()
 
     @kb.add(
         '"',
         filter=focused_insert
         & auto_match
-        & preceding_text(r'^([^"]+|"[^"]*")*$')
+        & not_inside_unclosed_string
         & following_text(r"[,)}\]]|$"),
     )
     def _(event):
         event.current_buffer.insert_text('""')
         event.current_buffer.cursor_left()
 
     @kb.add(
         "'",
         filter=focused_insert
         & auto_match
-        & preceding_text(r"^([^']+|'[^']*')*$")
+        & not_inside_unclosed_string
         & following_text(r"[,)}\]]|$"),
     )
     def _(event):
         event.current_buffer.insert_text("''")
         event.current_buffer.cursor_left()
 
+    @kb.add(
+        '"',
+        filter=focused_insert
+        & auto_match
+        & not_inside_unclosed_string
+        & preceding_text(r'^.*""$'),
+    )
+    def _(event):
+        event.current_buffer.insert_text('""""')
+        event.current_buffer.cursor_left(3)
+
+    @kb.add(
+        "'",
+        filter=focused_insert
+        & auto_match
+        & not_inside_unclosed_string
+        & preceding_text(r"^.*''$"),
+    )
+    def _(event):
+        event.current_buffer.insert_text("''''")
+        event.current_buffer.cursor_left(3)
+
     # raw string
     @kb.add(
         "(", filter=focused_insert & auto_match & preceding_text(r".*(r|R)[\"'](-*)$")
     )
     def _(event):
         matches = re.match(
             r".*(r|R)[\"'](-*)",
             event.current_buffer.document.current_line_before_cursor,
         )
         dashes = matches.group(2) or ""
         event.current_buffer.insert_text("()" + dashes)
         event.current_buffer.cursor_left(len(dashes) + 1)
 
     @kb.add(
         "[", filter=focused_insert & auto_match & preceding_text(r".*(r|R)[\"'](-*)$")
     )
     def _(event):
         matches = re.match(
             r".*(r|R)[\"'](-*)",
             event.current_buffer.document.current_line_before_cursor,
         )
         dashes = matches.group(2) or ""
         event.current_buffer.insert_text("[]" + dashes)
         event.current_buffer.cursor_left(len(dashes) + 1)
 
     @kb.add(
         "{", filter=focused_insert & auto_match & preceding_text(r".*(r|R)[\"'](-*)$")
     )
     def _(event):
         matches = re.match(
             r".*(r|R)[\"'](-*)",
             event.current_buffer.document.current_line_before_cursor,
         )
         dashes = matches.group(2) or ""
         event.current_buffer.insert_text("{}" + dashes)
         event.current_buffer.cursor_left(len(dashes) + 1)
 
     # just move cursor
     @kb.add(")", filter=focused_insert & auto_match & following_text(r"^\)"))
     @kb.add("]", filter=focused_insert & auto_match & following_text(r"^\]"))
     @kb.add("}", filter=focused_insert & auto_match & following_text(r"^\}"))
     @kb.add('"', filter=focused_insert & auto_match & following_text('^"'))
     @kb.add("'", filter=focused_insert & auto_match & following_text("^'"))
     def _(event):
         event.current_buffer.cursor_right()
 
     @kb.add(
         "backspace",
         filter=focused_insert
         & preceding_text(r".*\($")
         & auto_match
         & following_text(r"^\)"),
     )
     @kb.add(
         "backspace",
         filter=focused_insert
         & preceding_text(r".*\[$")
         & auto_match
         & following_text(r"^\]"),
     )
     @kb.add(
         "backspace",
         filter=focused_insert
         & preceding_text(r".*\{$")
         & auto_match
         & following_text(r"^\}"),
     )
     @kb.add(
         "backspace",
         filter=focused_insert
         & preceding_text('.*"$')
         & auto_match
         & following_text('^"'),
     )
     @kb.add(
         "backspace",
         filter=focused_insert
         & preceding_text(r".*'$")
         & auto_match
         & following_text(r"^'"),
     )
     def _(event):
         event.current_buffer.delete()
         event.current_buffer.delete_before_cursor()
 
     if shell.display_completions == "readlinelike":
         kb.add(
             "c-i",
             filter=(
                 has_focus(DEFAULT_BUFFER)
                 & ~has_selection
                 & insert_mode
                 & ~cursor_in_leading_ws
             ),
         )(display_completions_like_readline)
 
     if sys.platform == "win32":
         kb.add("c-v", filter=(has_focus(DEFAULT_BUFFER) & ~vi_mode))(win_paste)
 
     @Condition
     def ebivim():
         return shell.emacs_bindings_in_vi_insert_mode
 
     focused_insert_vi = has_focus(DEFAULT_BUFFER) & vi_insert_mode
 
     @kb.add("end", filter=has_focus(DEFAULT_BUFFER) & (ebivim | ~vi_insert_mode))
     def _(event):
         _apply_autosuggest(event)
 
     @kb.add("c-e", filter=focused_insert_vi & ebivim)
     def _(event):
         _apply_autosuggest(event)
 
     @kb.add("c-f", filter=focused_insert_vi)
     def _(event):
         b = event.current_buffer
         suggestion = b.suggestion
         if suggestion:
             b.insert_text(suggestion.text)
         else:
             nc.forward_char(event)
 
     @kb.add("escape", "f", filter=focused_insert_vi & ebivim)
     def _(event):
         b = event.current_buffer
         suggestion = b.suggestion
         if suggestion:
             t = re.split(r"(\S+\s+)", suggestion.text)
             b.insert_text(next((x for x in t if x), ""))
         else:
             nc.forward_word(event)
 
     # Simple Control keybindings
     key_cmd_dict = {
         "c-a": nc.beginning_of_line,
         "c-b": nc.backward_char,
         "c-k": nc.kill_line,
         "c-w": nc.backward_kill_word,
         "c-y": nc.yank,
         "c-_": nc.undo,
     }
 
     for key, cmd in key_cmd_dict.items():
         kb.add(key, filter=focused_insert_vi & ebivim)(cmd)
 
     # Alt and Combo Control keybindings
     keys_cmd_dict = {
         # Control Combos
         ("c-x", "c-e"): nc.edit_and_execute,
         ("c-x", "e"): nc.edit_and_execute,
         # Alt
         ("escape", "b"): nc.backward_word,
         ("escape", "c"): nc.capitalize_word,
         ("escape", "d"): nc.kill_word,
         ("escape", "h"): nc.backward_kill_word,
         ("escape", "l"): nc.downcase_word,
         ("escape", "u"): nc.uppercase_word,
         ("escape", "y"): nc.yank_pop,
         ("escape", "."): nc.yank_last_arg,
     }
 
     for keys, cmd in keys_cmd_dict.items():
         kb.add(*keys, filter=focused_insert_vi & ebivim)(cmd)
 
     def get_input_mode(self):
         app = get_app()
         app.ttimeoutlen = shell.ttimeoutlen
         app.timeoutlen = shell.timeoutlen
 
         return self._input_mode
 
     def set_input_mode(self, mode):
         shape = {InputMode.NAVIGATION: 2, InputMode.REPLACE: 4}.get(mode, 6)
         cursor = "\x1b[{} q".format(shape)
 
         sys.stdout.write(cursor)
         sys.stdout.flush()
 
         self._input_mode = mode
 
     if shell.editing_mode == "vi" and shell.modal_cursor:
         ViState._input_mode = InputMode.INSERT
         ViState.input_mode = property(get_input_mode, set_input_mode)
 
     return kb
 
 
 def reformat_text_before_cursor(buffer, document, shell):
     text = buffer.delete_before_cursor(len(document.text[:document.cursor_position]))
     try:
         formatted_text = shell.reformat_handler(text)
         buffer.insert_text(formatted_text)
     except Exception as e:
         buffer.insert_text(text)
 
 
 def newline_or_execute_outer(shell):
 
     def newline_or_execute(event):
         """When the user presses return, insert a newline or execute the code."""
         b = event.current_buffer
         d = b.document
 
         if b.complete_state:
             cc = b.complete_state.current_completion
             if cc:
                 b.apply_completion(cc)
             else:
                 b.cancel_completion()
             return
 
         # If there's only one line, treat it as if the cursor is at the end.
         # See https://github.com/ipython/ipython/issues/10425
         if d.line_count == 1:
             check_text = d.text
         else:
             check_text = d.text[:d.cursor_position]
         status, indent = shell.check_complete(check_text)
        
         # if all we have after the cursor is whitespace: reformat current text
         # before cursor
         after_cursor = d.text[d.cursor_position:]
         reformatted = False
         if not after_cursor.strip():
             reformat_text_before_cursor(b, d, shell)
             reformatted = True
         if not (d.on_last_line or
                 d.cursor_position_row >= d.line_count - d.empty_line_count_at_the_end()
                 ):
             if shell.autoindent:
                 b.insert_text('\n' + indent)
             else:
                 b.insert_text('\n')
             return
 
         if (status != 'incomplete') and b.accept_handler:
             if not reformatted:
                 reformat_text_before_cursor(b, d, shell)
             b.validate_and_handle()
         else:
             if shell.autoindent:
                 b.insert_text('\n' + indent)
             else:
                 b.insert_text('\n')
     return newline_or_execute
 
 
 def previous_history_or_previous_completion(event):
     """
     Control-P in vi edit mode on readline is history next, unlike default prompt toolkit.
 
     If completer is open this still select previous completion.
     """
     event.current_buffer.auto_up()
 
 
 def next_history_or_next_completion(event):
     """
     Control-N in vi edit mode on readline is history previous, unlike default prompt toolkit.
 
     If completer is open this still select next completion.
     """
     event.current_buffer.auto_down()
 
 
 def dismiss_completion(event):
     b = event.current_buffer
     if b.complete_state:
         b.cancel_completion()
 
 
 def reset_buffer(event):
     b = event.current_buffer
     if b.complete_state:
         b.cancel_completion()
     else:
         b.reset()
 
 
 def reset_search_buffer(event):
     if event.current_buffer.document.text:
         event.current_buffer.reset()
     else:
         event.app.layout.focus(DEFAULT_BUFFER)
 
 def suspend_to_bg(event):
     event.app.suspend_to_background()
 
 def quit(event):
     """
     On platforms that support SIGQUIT, send SIGQUIT to the current process.
     On other platforms, just exit the process with a message.
     """
     sigquit = getattr(signal, "SIGQUIT", None)
     if sigquit is not None:
         os.kill(0, signal.SIGQUIT)
     else:
         sys.exit("Quit")
 
 def indent_buffer(event):
     event.current_buffer.insert_text(' ' * 4)
 
 @undoc
 def newline_with_copy_margin(event):
     """
     DEPRECATED since IPython 6.0
 
     See :any:`newline_autoindent_outer` for a replacement.
 
     Preserve margin and cursor position when using
     Control-O to insert a newline in EMACS mode
     """
     warnings.warn("`newline_with_copy_margin(event)` is deprecated since IPython 6.0. "
       "see `newline_autoindent_outer(shell)(event)` for a replacement.",
                   DeprecationWarning, stacklevel=2)
 
     b = event.current_buffer
     cursor_start_pos = b.document.cursor_position_col
     b.newline(copy_margin=True)
     b.cursor_up(count=1)
     cursor_end_pos = b.document.cursor_position_col
     if cursor_start_pos != cursor_end_pos:
         pos_diff = cursor_start_pos - cursor_end_pos
         b.cursor_right(count=pos_diff)
 
 def newline_autoindent_outer(inputsplitter) -> Callable[..., None]:
     """
     Return a function suitable for inserting a indented newline after the cursor.
 
     Fancier version of deprecated ``newline_with_copy_margin`` which should
     compute the correct indentation of the inserted line. That is to say, indent
     by 4 extra space after a function definition, class definition, context
     manager... And dedent by 4 space after ``pass``, ``return``, ``raise ...``.
     """
 
     def newline_autoindent(event):
         """insert a newline after the cursor indented appropriately."""
         b = event.current_buffer
         d = b.document
 
         if b.complete_state:
             b.cancel_completion()
         text = d.text[:d.cursor_position] + '\n'
         _, indent = inputsplitter.check_complete(text)
         b.insert_text('\n' + (' ' * (indent or 0)), move_cursor=False)
 
     return newline_autoindent
 
 
 def open_input_in_editor(event):
     event.app.current_buffer.open_in_editor()
 
 
 if sys.platform == 'win32':
     from IPython.core.error import TryNext
     from IPython.lib.clipboard import (ClipboardEmpty,
                                        win32_clipboard_get,
                                        tkinter_clipboard_get)
 
     @undoc
     def win_paste(event):
         try:
             text = win32_clipboard_get()
         except TryNext:
             try:
                 text = tkinter_clipboard_get()
             except (TryNext, ClipboardEmpty):
                 return
         except ClipboardEmpty:
             return
         event.current_buffer.insert_text(text.replace("\t", " " * 4))

IPython/utils/contexts.py

@@ -1,60 +1,61 b''
 # encoding: utf-8
 """Miscellaneous context managers.
 """
 
 import warnings
 
 # Copyright (c) IPython Development Team.
 # Distributed under the terms of the Modified BSD License.
 
+
 class preserve_keys(object):
     """Preserve a set of keys in a dictionary.
 
     Upon entering the context manager the current values of the keys
     will be saved. Upon exiting, the dictionary will be updated to
     restore the original value of the preserved keys. Preserved keys
     which did not exist when entering the context manager will be
     deleted.
 
     Examples
     --------
 
     >>> d = {'a': 1, 'b': 2, 'c': 3}
     >>> with preserve_keys(d, 'b', 'c', 'd'):
     ...     del d['a']
     ...     del d['b']      # will be reset to 2
     ...     d['c'] = None   # will be reset to 3
     ...     d['d'] = 4      # will be deleted
     ...     d['e'] = 5
     ...     print(sorted(d.items()))
     ...
     [('c', None), ('d', 4), ('e', 5)]
     >>> print(sorted(d.items()))
     [('b', 2), ('c', 3), ('e', 5)]
     """
 
     def __init__(self, dictionary, *keys):
         self.dictionary = dictionary
         self.keys = keys
 
     def __enter__(self):
         # Actions to perform upon exiting.
         to_delete = []
         to_update = {}
 
         d = self.dictionary
         for k in self.keys:
             if k in d:
                 to_update[k] = d[k]
             else:
                 to_delete.append(k)
 
         self.to_delete = to_delete
         self.to_update = to_update
 
     def __exit__(self, *exc_info):
         d = self.dictionary
 
         for k in self.to_delete:
             d.pop(k, None)
         d.update(self.to_update)

IPython/utils/eventful.py

@@ -1,6 +1,5 b''
-
 from warnings import warn
 
 warn("IPython.utils.eventful has moved to traitlets.eventful", stacklevel=2)
 
 from traitlets.eventful import *

IPython/utils/log.py

@@ -1,6 +1,5 b''
-
 from warnings import warn
 
 warn("IPython.utils.log has moved to traitlets.log", stacklevel=2)
 
 from traitlets.log import *

IPython/utils/path.py

@@ -1,392 +1,393 b''
 # encoding: utf-8
 """
 Utilities for path handling.
 """
 
 # Copyright (c) IPython Development Team.
 # Distributed under the terms of the Modified BSD License.
 
 import os
 import sys
 import errno
 import shutil
 import random
 import glob
 from warnings import warn
 
 from IPython.utils.process import system
 from IPython.utils.decorators import undoc
 
 #-----------------------------------------------------------------------------
 # Code
 #-----------------------------------------------------------------------------
 fs_encoding = sys.getfilesystemencoding()
 
 def _writable_dir(path):
     """Whether `path` is a directory, to which the user has write access."""
     return os.path.isdir(path) and os.access(path, os.W_OK)
 
 if sys.platform == 'win32':
     def _get_long_path_name(path):
         """Get a long path name (expand ~) on Windows using ctypes.
 
         Examples
         --------
 
         >>> get_long_path_name('c:\\\\docume~1')
         'c:\\\\Documents and Settings'
 
         """
         try:
             import ctypes
         except ImportError as e: 
             raise ImportError('you need to have ctypes installed for this to work') from e
         _GetLongPathName = ctypes.windll.kernel32.GetLongPathNameW
         _GetLongPathName.argtypes = [ctypes.c_wchar_p, ctypes.c_wchar_p,
             ctypes.c_uint ]
 
         buf = ctypes.create_unicode_buffer(260)
         rv = _GetLongPathName(path, buf, 260)
         if rv == 0 or rv > 260:
             return path
         else:
             return buf.value
 else:
     def _get_long_path_name(path):
         """Dummy no-op."""
         return path
 
 
 
 def get_long_path_name(path):
     """Expand a path into its long form.
 
     On Windows this expands any ~ in the paths. On other platforms, it is
     a null operation.
     """
     return _get_long_path_name(path)
 
 
 def compress_user(path):
     """Reverse of :func:`os.path.expanduser`
     """
     home = os.path.expanduser('~')
     if path.startswith(home):
         path =  "~" + path[len(home):]
     return path
 
 def get_py_filename(name):
     """Return a valid python filename in the current directory.
 
     If the given name is not a file, it adds '.py' and searches again.
     Raises IOError with an informative message if the file isn't found.
     """
 
     name = os.path.expanduser(name)
-    if not os.path.isfile(name) and not name.endswith('.py'):
-        name += '.py'
     if os.path.isfile(name):
         return name
-    else:
-        raise IOError('File `%r` not found.' % name)
+    if not name.endswith(".py"):
+        py_name = name + ".py"
+        if os.path.isfile(py_name):
+            return py_name
+    raise IOError("File `%r` not found." % name)
 
 
 def filefind(filename: str, path_dirs=None) -> str:
     """Find a file by looking through a sequence of paths.
 
     This iterates through a sequence of paths looking for a file and returns
     the full, absolute path of the first occurrence of the file.  If no set of
     path dirs is given, the filename is tested as is, after running through
     :func:`expandvars` and :func:`expanduser`.  Thus a simple call::
 
         filefind('myfile.txt')
 
     will find the file in the current working dir, but::
 
         filefind('~/myfile.txt')
 
     Will find the file in the users home directory.  This function does not
     automatically try any paths, such as the cwd or the user's home directory.
 
     Parameters
     ----------
     filename : str
         The filename to look for.
     path_dirs : str, None or sequence of str
         The sequence of paths to look for the file in.  If None, the filename
         need to be absolute or be in the cwd.  If a string, the string is
         put into a sequence and the searched.  If a sequence, walk through
         each element and join with ``filename``, calling :func:`expandvars`
         and :func:`expanduser` before testing for existence.
 
     Returns
     -------
     path : str
         returns absolute path to file.
 
     Raises
     ------
     IOError
     """
 
     # If paths are quoted, abspath gets confused, strip them...
     filename = filename.strip('"').strip("'")
     # If the input is an absolute path, just check it exists
     if os.path.isabs(filename) and os.path.isfile(filename):
         return filename
 
     if path_dirs is None:
         path_dirs = ("",)
     elif isinstance(path_dirs, str):
         path_dirs = (path_dirs,)
 
     for path in path_dirs:
         if path == '.': path = os.getcwd()
         testname = expand_path(os.path.join(path, filename))
         if os.path.isfile(testname):
             return os.path.abspath(testname)
 
     raise IOError("File %r does not exist in any of the search paths: %r" %
                   (filename, path_dirs) )
 
 
 class HomeDirError(Exception):
     pass
 
 
 def get_home_dir(require_writable=False) -> str:
     """Return the 'home' directory, as a unicode string.
 
     Uses os.path.expanduser('~'), and checks for writability.
 
     See stdlib docs for how this is determined.
     For Python <3.8, $HOME is first priority on *ALL* platforms.
     For Python >=3.8 on Windows, %HOME% is no longer considered.
 
     Parameters
     ----------
     require_writable : bool [default: False]
         if True:
             guarantees the return value is a writable directory, otherwise
             raises HomeDirError
         if False:
             The path is resolved, but it is not guaranteed to exist or be writable.
     """
 
     homedir = os.path.expanduser('~')
     # Next line will make things work even when /home/ is a symlink to
     # /usr/home as it is on FreeBSD, for example
     homedir = os.path.realpath(homedir)
 
     if not _writable_dir(homedir) and os.name == 'nt':
         # expanduser failed, use the registry to get the 'My Documents' folder.
         try:
             import winreg as wreg
             with wreg.OpenKey(
                 wreg.HKEY_CURRENT_USER,
                 r"Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders"
             ) as key:
                 homedir = wreg.QueryValueEx(key,'Personal')[0]
         except:
             pass
 
     if (not require_writable) or _writable_dir(homedir):
         assert isinstance(homedir, str), "Homedir should be unicode not bytes"
         return homedir
     else:
         raise HomeDirError('%s is not a writable dir, '
                 'set $HOME environment variable to override' % homedir)
 
 def get_xdg_dir():
     """Return the XDG_CONFIG_HOME, if it is defined and exists, else None.
 
     This is only for non-OS X posix (Linux,Unix,etc.) systems.
     """
 
     env = os.environ
 
     if os.name == "posix":
         # Linux, Unix, AIX, etc.
         # use ~/.config if empty OR not set
         xdg = env.get("XDG_CONFIG_HOME", None) or os.path.join(get_home_dir(), '.config')
         if xdg and _writable_dir(xdg):
             assert isinstance(xdg, str)
             return xdg
 
     return None
 
 
 def get_xdg_cache_dir():
     """Return the XDG_CACHE_HOME, if it is defined and exists, else None.
 
     This is only for non-OS X posix (Linux,Unix,etc.) systems.
     """
 
     env = os.environ
 
     if os.name == "posix":
         # Linux, Unix, AIX, etc.
         # use ~/.cache if empty OR not set
         xdg = env.get("XDG_CACHE_HOME", None) or os.path.join(get_home_dir(), '.cache')
         if xdg and _writable_dir(xdg):
             assert isinstance(xdg, str)
             return xdg
 
     return None
 
 
 def expand_path(s):
     """Expand $VARS and ~names in a string, like a shell
 
     :Examples:
 
        In [2]: os.environ['FOO']='test'
 
        In [3]: expand_path('variable FOO is $FOO')
        Out[3]: 'variable FOO is test'
     """
     # This is a pretty subtle hack. When expand user is given a UNC path
     # on Windows (\\server\share$\%username%), os.path.expandvars, removes
     # the $ to get (\\server\share\%username%). I think it considered $
     # alone an empty var. But, we need the $ to remains there (it indicates
     # a hidden share).
     if os.name=='nt':
         s = s.replace('$\\', 'IPYTHON_TEMP')
     s = os.path.expandvars(os.path.expanduser(s))
     if os.name=='nt':
         s = s.replace('IPYTHON_TEMP', '$\\')
     return s
 
 
 def unescape_glob(string):
     """Unescape glob pattern in `string`."""
     def unescape(s):
         for pattern in '*[]!?':
             s = s.replace(r'\{0}'.format(pattern), pattern)
         return s
     return '\\'.join(map(unescape, string.split('\\\\')))
 
 
 def shellglob(args):
     """
     Do glob expansion for each element in `args` and return a flattened list.
 
     Unmatched glob pattern will remain as-is in the returned list.
 
     """
     expanded = []
     # Do not unescape backslash in Windows as it is interpreted as
     # path separator:
     unescape = unescape_glob if sys.platform != 'win32' else lambda x: x
     for a in args:
         expanded.extend(glob.glob(a) or [unescape(a)])
     return expanded
 
 
 def target_outdated(target,deps):
     """Determine whether a target is out of date.
 
     target_outdated(target,deps) -> 1/0
 
     deps: list of filenames which MUST exist.
     target: single filename which may or may not exist.
 
     If target doesn't exist or is older than any file listed in deps, return
     true, otherwise return false.
     """
     try:
         target_time = os.path.getmtime(target)
     except os.error:
         return 1
     for dep in deps:
         dep_time = os.path.getmtime(dep)
         if dep_time > target_time:
             #print "For target",target,"Dep failed:",dep # dbg
             #print "times (dep,tar):",dep_time,target_time # dbg
             return 1
     return 0
 
 
 def target_update(target,deps,cmd):
     """Update a target with a given command given a list of dependencies.
 
     target_update(target,deps,cmd) -> runs cmd if target is outdated.
 
     This is just a wrapper around target_outdated() which calls the given
     command if target is outdated."""
 
     if target_outdated(target,deps):
         system(cmd)
 
 
 ENOLINK = 1998
 
 def link(src, dst):
     """Hard links ``src`` to ``dst``, returning 0 or errno.
 
     Note that the special errno ``ENOLINK`` will be returned if ``os.link`` isn't
     supported by the operating system.
     """
 
     if not hasattr(os, "link"):
         return ENOLINK
     link_errno = 0
     try:
         os.link(src, dst)
     except OSError as e:
         link_errno = e.errno
     return link_errno
 
 
 def link_or_copy(src, dst):
     """Attempts to hardlink ``src`` to ``dst``, copying if the link fails.
 
     Attempts to maintain the semantics of ``shutil.copy``.
 
     Because ``os.link`` does not overwrite files, a unique temporary file
     will be used if the target already exists, then that file will be moved
     into place.
     """
 
     if os.path.isdir(dst):
         dst = os.path.join(dst, os.path.basename(src))
 
     link_errno = link(src, dst)
     if link_errno == errno.EEXIST:
         if os.stat(src).st_ino == os.stat(dst).st_ino:
             # dst is already a hard link to the correct file, so we don't need
             # to do anything else. If we try to link and rename the file
             # anyway, we get duplicate files - see http://bugs.python.org/issue21876
             return
 
         new_dst = dst + "-temp-%04X" %(random.randint(1, 16**4), )
         try:
             link_or_copy(src, new_dst)
         except:
             try:
                 os.remove(new_dst)
             except OSError:
                 pass
             raise
         os.rename(new_dst, dst)
     elif link_errno != 0:
         # Either link isn't supported, or the filesystem doesn't support
         # linking, or 'src' and 'dst' are on different filesystems.
         shutil.copy(src, dst)
 
 def ensure_dir_exists(path, mode=0o755):
     """ensure that a directory exists
 
     If it doesn't exist, try to create it and protect against a race condition
     if another process is doing the same.
 
     The default permissions are 755, which differ from os.makedirs default of 777.
     """
     if not os.path.exists(path):
         try:
             os.makedirs(path, mode=mode)
         except OSError as e:
             if e.errno != errno.EEXIST:
                 raise
     elif not os.path.isdir(path):
         raise IOError("%r exists but is not a directory" % path)

IPython/utils/tempdir.py

@@ -1,58 +1,59 b''
 """ This module contains classes - NamedFileInTemporaryDirectory, TemporaryWorkingDirectory.
 
 These classes add extra features such as creating a named file in temporary directory and
 creating a context manager for the working directory which is also temporary.
 """
 
 import os as _os
 from pathlib import Path
 from tempfile import TemporaryDirectory
 
 
 class NamedFileInTemporaryDirectory(object):
     def __init__(self, filename, mode="w+b", bufsize=-1, add_to_syspath=False, **kwds):
         """
         Open a file named `filename` in a temporary directory.
 
         This context manager is preferred over `NamedTemporaryFile` in
         stdlib `tempfile` when one needs to reopen the file.
 
         Arguments `mode` and `bufsize` are passed to `open`.
         Rest of the arguments are passed to `TemporaryDirectory`.
 
         """
         self._tmpdir = TemporaryDirectory(**kwds)
         path = Path(self._tmpdir.name) / filename
         encoding = None if "b" in mode else "utf-8"
         self.file = open(path, mode, bufsize, encoding=encoding)
 
     def cleanup(self):
         self.file.close()
         self._tmpdir.cleanup()
 
     __del__ = cleanup
 
     def __enter__(self):
         return self.file
 
     def __exit__(self, type, value, traceback):
         self.cleanup()
 
 
 class TemporaryWorkingDirectory(TemporaryDirectory):
     """
     Creates a temporary directory and sets the cwd to that directory.
     Automatically reverts to previous cwd upon cleanup.
     Usage example:
 
         with TemporaryWorkingDirectory() as tmpdir:
             ...
     """
+
     def __enter__(self):
         self.old_wd = Path.cwd()
         _os.chdir(self.name)
         return super(TemporaryWorkingDirectory, self).__enter__()
 
     def __exit__(self, exc, value, tb):
         _os.chdir(self.old_wd)
         return super(TemporaryWorkingDirectory, self).__exit__(exc, value, tb)

docs/source/whatsnew/development.rst

@@ -1,33 +1,34 b''
 =====================
  Development version
 =====================
 
 This document describes in-flight development work.
 
 .. warning::
 
     Please do not edit this file by hand (doing so will likely cause merge
     conflicts for other Pull Requests). Instead, create a new file in the
     `docs/source/whatsnew/pr` folder
 
 
 Released .... ...., 2019
 
 
 Need to be updated:
 
 .. toctree::
    :maxdepth: 2
    :glob:
 
    pr/*
 
 
 
 
+
 .. DO NOT EDIT THIS LINE BEFORE RELEASE. FEATURE INSERTION POINT.
 
 Backwards incompatible changes
 ------------------------------
 
 .. DO NOT EDIT THIS LINE BEFORE RELEASE. INCOMPAT INSERTION POINT.

docs/source/whatsnew/version8.rst

@@ -1,1080 +1,1196 b''
 ============
  8.x Series
 ============
 
+.. _version 8.5.0:
+
+IPython 8.5.0
+-------------
+
+First release since a couple of month due to various reasons and timing preventing
+me for sticking to the usual monthly release the last Friday of each month. This
+is of non negligible size as it has more than two dozen PRs with various fixes
+an bug fixes.
+
+Many thanks to everybody who contributed PRs for your patience in review and
+merges.
+
+Here is a non exhaustive list of changes that have been implemented for IPython
+8.5.0. As usual you can find the full list of issues and PRs tagged with `the
+8.5 milestone
+<https://github.com/ipython/ipython/pulls?q=is%3Aclosed+milestone%3A8.5+>`__.
+
+ - Added shortcut for accepting auto suggestion. The End key shortcut for
+   accepting auto-suggestion This binding works in Vi mode too, provided
+   ``TerminalInteractiveShell.emacs_bindings_in_vi_insert_mode`` is set to be
+   ``True`` :ghpull:`13566`.
+
+ - No popup in window for latex generation w hen generating latex (e.g. via
+   `_latex_repr_`) no popup window is shows under Windows. :ghpull:`13679`
+
+ - Fixed error raised when attempting to tab-complete an input string with
+   consecutive periods or forward slashes (such as "file:///var/log/...").
+   :ghpull:`13675`
+
+ - Relative filenames in Latex rendering :
+   The `latex_to_png_dvipng` command internally generates input and output file
+   arguments to `latex` and `dvipis`. These arguments are now generated as
+   relative files to the current working directory instead of absolute file
+   paths. This solves a problem where the current working directory contains
+   characters that are not handled properly by `latex` and `dvips`. There are
+   no changes to the user API. :ghpull:`13680`
+
+ - Stripping decorators bug: Fixed bug which meant that ipython code blocks in
+   restructured text documents executed with the ipython-sphinx extension
+   skipped any lines of code containing python decorators. :ghpull:`13612`
+
+ - Allow some modules with frozen dataclasses to be reloaded. :ghpull:`13732`
+ - Fix paste magic on wayland. :ghpull:`13671`
+ - show maxlen in deque's repr. :ghpull:`13648`
+
+Restore line numbers for Input 
+------------------------------
+
+Line number information in tracebacks from input are restored.
+Line numbers from input were removed during the transition to v8 enhanced traceback reporting.
+
+So, instead of::
+
+    ---------------------------------------------------------------------------
+    ZeroDivisionError                         Traceback (most recent call last)
+    Input In [3], in <cell line: 1>()
+    ----> 1 myfunc(2)
+
+    Input In [2], in myfunc(z)
+          1 def myfunc(z):
+    ----> 2     foo.boo(z-1)
+
+    File ~/code/python/ipython/foo.py:3, in boo(x)
+          2 def boo(x):
+    ----> 3     return 1/(1-x)
+
+    ZeroDivisionError: division by zero
+
+The error traceback now looks like::
+
+      ---------------------------------------------------------------------------
+      ZeroDivisionError                         Traceback (most recent call last)
+      Cell In [3], line 1
+      ----> 1 myfunc(2)
+
+      Cell In [2], line 2, in myfunc(z)
+            1 def myfunc(z):
+      ----> 2     foo.boo(z-1)
+
+      File ~/code/python/ipython/foo.py:3, in boo(x)
+            2 def boo(x):
+      ----> 3     return 1/(1-x)
+
+      ZeroDivisionError: division by zero
+
+or, with xmode=Plain::
+
+    Traceback (most recent call last):
+      Cell In [12], line 1
+        myfunc(2)
+      Cell In [6], line 2 in myfunc
+        foo.boo(z-1)
+      File ~/code/python/ipython/foo.py:3 in boo
+        return 1/(1-x)
+    ZeroDivisionError: division by zero
+
+:ghpull:`13560`
+
+New setting to silence warning if working inside a virtual environment
+----------------------------------------------------------------------
+
+Previously, when starting IPython in a virtual environment without IPython installed (so IPython from the global environment is used), the following warning was printed:
+
+    Attempting to work in a virtualenv. If you encounter problems, please install IPython inside the virtualenv.
+
+This warning can be permanently silenced by setting ``c.InteractiveShell.warn_venv`` to ``False`` (the default is ``True``).
+
+:ghpull:`13706`
+
+-------
+
+Thanks to the `D. E. Shaw group <https://deshaw.com/>`__ for sponsoring
+work on IPython and related libraries.
+
+
 .. _version 8.4.0:
 
 IPython 8.4.0
 -------------
 
 As for 7.34, this version contains a single fix:  fix uncaught BdbQuit exceptions on ipdb
 exit :ghpull:`13668`, and a single typo fix in documentation: :ghpull:`13682`
 
 Thanks to the `D. E. Shaw group <https://deshaw.com/>`__ for sponsoring
 work on IPython and related libraries.
 
 
 .. _version 8.3.0:
 
 IPython 8.3.0
 -------------
 
  - :ghpull:`13625`, using ``?``, ``??``, ``*?`` will not call
    ``set_next_input`` as most frontend allow proper multiline editing and it was
    causing issues for many users of multi-cell frontends. This has been backported to 7.33
 
 
  - :ghpull:`13600`, ``pre_run_*``-hooks will now have a ``cell_id`` attribute on
    the info object when frontend provide it. This has been backported to 7.33
 
  - :ghpull:`13624`, fixed :kbd:`End` key being broken after accepting an
    auto-suggestion.
 
  - :ghpull:`13657` fix issue where history from different sessions would be mixed.
 
 .. _version 8.2.0:
 
 IPython 8.2.0
 -------------
 
 IPython 8.2 mostly bring bugfixes to IPython.
 
  - Auto-suggestion can now be elected with the ``end`` key. :ghpull:`13566`
  - Some traceback issues with ``assert etb is not None`` have been fixed. :ghpull:`13588`
  - History is now pulled from the sqitel database and not from in-memory.
    In particular when using the ``%paste`` magic, the content of the pasted text will
    be part of the history and not the verbatim text ``%paste`` anymore. :ghpull:`13592`
  - Fix ``Ctrl-\\`` exit cleanup :ghpull:`13603`
  - Fixes to ``ultratb`` ipdb support when used outside of IPython. :ghpull:`13498`
 
 
 I am still trying to fix and investigate :ghissue:`13598`, which seem to be
 random, and would appreciate help if you find  reproducible minimal case. I've
 tried to make various changes to the codebase to mitigate it, but a proper fix
 will be difficult without understanding the cause.
 
 
 All the issues on pull-requests for this release can be found in the `8.2
 milestone. <https://github.com/ipython/ipython/milestone/100>`__ . And some
 documentation only PR can be found as part of the `7.33 milestone
 <https://github.com/ipython/ipython/milestone/101>`__ (currently not released).
 
 Thanks to the `D. E. Shaw group <https://deshaw.com/>`__ for sponsoring
 work on IPython and related libraries.
 
 .. _version 8.1.1:
    
 IPython 8.1.1
 -------------
 
 Fix an issue with virtualenv and Python 3.8 introduced in 8.1
 
 Revert :ghpull:`13537` (fix an issue with symlinks in virtualenv) that raises an
 error in Python 3.8, and fixed in a different way in :ghpull:`13559`.
 
 .. _version 8.1:
 
 IPython 8.1.0
 -------------
 
 IPython 8.1 is the first minor release after 8.0 and fixes a number of bugs and
 Update a few behavior that were problematic with the 8.0 as with many new major
 release.
 
 Note that beyond the changes listed here, IPython 8.1.0 also contains all the
 features listed in :ref:`version 7.32`.
 
  - Misc and multiple fixes around quotation auto-closing. It is now disabled by
    default. Run with ``TerminalInteractiveShell.auto_match=True`` to re-enabled
  - Require pygments>=2.4.0 :ghpull:`13459`, this was implicit in the code, but
    is now explicit in ``setup.cfg``/``setup.py``
  - Docs improvement of ``core.magic_arguments`` examples. :ghpull:`13433`
  - Multi-line edit executes too early with await. :ghpull:`13424`
 
  - ``black``  is back as an optional dependency, and autoformatting disabled by
    default until some fixes are implemented (black improperly reformat magics).
    :ghpull:`13471` Additionally the ability to use ``yapf`` as a code
    reformatter has been added :ghpull:`13528` . You can use
    ``TerminalInteractiveShell.autoformatter="black"``,
    ``TerminalInteractiveShell.autoformatter="yapf"`` to re-enable auto formating
    with black, or switch to yapf.
 
  - Fix and issue where ``display`` was not defined.
 
  - Auto suggestions are now configurable. Currently only
    ``AutoSuggestFromHistory`` (default) and ``None``. new provider contribution
    welcomed. :ghpull:`13475`
 
  - multiple packaging/testing improvement to simplify downstream packaging
    (xfail with reasons, try to not access network...).
 
  - Update deprecation. ``InteractiveShell.magic`` internal method has been
    deprecated for many years but did not emit a warning until now.
 
  - internal ``appended_to_syspath`` context manager has been deprecated.
 
  - fix an issue with symlinks in virtualenv :ghpull:`13537` (Reverted in 8.1.1)
 
  - Fix an issue with vim mode, where cursor would not be reset on exit :ghpull:`13472`
 
  - ipython directive now remove only known pseudo-decorators :ghpull:`13532`
 
  - ``IPython/lib/security`` which used to be used for jupyter notebook has been
    removed.
 
  - Fix an issue where ``async with`` would execute on new lines. :ghpull:`13436`
 
 
 We want to remind users that IPython is part of the Jupyter organisations, and
 thus governed by a Code of Conduct. Some of the behavior we have seen on GitHub is not acceptable.
 Abuse and non-respectful comments on discussion will not be tolerated.
 
 Many thanks to all the contributors to this release, many of the above fixed issue and
 new features where done by first time contributors, showing there is still
 plenty of easy contribution possible in IPython
 . You can find all individual contributions
 to this milestone `on github <https://github.com/ipython/ipython/milestone/91>`__.
 
 Thanks as well to the `D. E. Shaw group <https://deshaw.com/>`__ for sponsoring
 work on IPython and related libraries. In particular the Lazy autoloading of
 magics that you will find described in the 7.32 release notes.
 
 
 .. _version 8.0.1:
 
 IPython 8.0.1 (CVE-2022-21699)
 ------------------------------
 
 IPython 8.0.1, 7.31.1 and 5.11 are security releases that change some default
 values in order to prevent potential Execution with Unnecessary Privileges.
 
 Almost all version of IPython looks for configuration and profiles in current
 working directory. Since IPython was developed before pip and environments
 existed it was used a convenient way to load code/packages in a project
 dependant way.
 
 In 2022, it is not necessary anymore, and can lead to confusing behavior where
 for example cloning a repository and starting IPython or loading a notebook from
 any Jupyter-Compatible interface that has ipython set as a kernel can lead to
 code execution.
 
 
 I did not find any standard way for packaged to advertise CVEs they fix, I'm
 thus trying to add a ``__patched_cves__`` attribute to the IPython module that
 list the CVEs that should have been fixed. This attribute is informational only
 as if a executable has a flaw, this value can always be changed by an attacker.
 
 .. code::
 
     In [1]: import IPython
 
     In [2]: IPython.__patched_cves__
     Out[2]: {'CVE-2022-21699'}
 
     In [3]: 'CVE-2022-21699' in IPython.__patched_cves__
     Out[3]: True
 
 Thus starting with this version:
 
  - The current working directory is not searched anymore for profiles or
    configurations files.
  - Added a ``__patched_cves__`` attribute (set of strings) to IPython module that contain
    the list of fixed CVE. This is informational only.
 
 Further details can be read on the `GitHub Advisory <https://github.com/ipython/ipython/security/advisories/GHSA-pq7m-3gw7-gq5x>`__
 
 
 .. _version 8.0:
 
 IPython 8.0
 -----------
 
 IPython 8.0 is bringing a large number of new features and improvements to both the
 user of the terminal and of the kernel via Jupyter. The removal of compatibility
 with older version of Python is also the opportunity to do a couple of
 performance improvements in particular with respect to startup time.
 The 8.x branch started diverging from its predecessor around IPython 7.12
 (January 2020).
 
 This release contains 250+ pull requests, in addition to many of the features
 and backports that have made it to the 7.x branch. Please see the 
 `8.0 milestone <https://github.com/ipython/ipython/milestone/73?closed=1>`__ for the full list of pull requests.
 
 Please feel free to send pull requests to updates those notes after release, 
 I have likely forgotten a few things reviewing 250+ PRs.
 
 Dependencies changes/downstream packaging
 -----------------------------------------
 
 Most of our building steps have been changed to be (mostly) declarative
 and follow PEP 517. We are trying to completely remove ``setup.py`` (:ghpull:`13238`) and are
 looking for help to do so.
 
  - minimum supported ``traitlets`` version is now 5+
  - we now require ``stack_data``
  - minimal Python is now 3.8
  - ``nose`` is not a testing requirement anymore
  - ``pytest`` replaces nose.
  - ``iptest``/``iptest3`` cli entrypoints do not exists anymore. 
  - minimum officially support ``numpy`` version has been bumped, but this should
    not have much effect on packaging.
 
 
 Deprecation and removal
 -----------------------
 
 We removed almost all features, arguments, functions, and modules that were
 marked as deprecated between IPython 1.0 and 5.0. As a reminder, 5.0 was released
 in 2016, and 1.0 in 2013. Last release of the 5 branch was 5.10.0, in May 2020.
 The few remaining deprecated features we left have better deprecation warnings
 or have been turned into explicit errors for better error messages.
 
 I will use this occasion to add the following requests to anyone emitting a
 deprecation warning:
 
  - Please add at least ``stacklevel=2`` so that the warning is emitted into the
    caller context, and not the callee one.
  - Please add **since which version** something is deprecated.
 
 As a side note, it is much easier to conditionally compare version
 numbers rather than using ``try/except`` when functionality changes with a version. 
 
 I won't list all the removed features here, but modules like ``IPython.kernel``,
 which was just a shim module around ``ipykernel`` for the past 8 years, have been
 removed, and so many other similar things that pre-date the name **Jupyter**
 itself.
 
 We no longer need to add ``IPython.extensions`` to the PYTHONPATH because that is being
 handled by ``load_extension``.
 
 We are also removing ``Cythonmagic``, ``sympyprinting`` and ``rmagic`` as they are now in
 other packages and no longer need to be inside IPython.
 
 
 Documentation
 -------------
 
 The majority of our docstrings have now been reformatted and automatically fixed by
 the experimental `Vélin <https://pypi.org/project/velin/>`_ project to conform
 to numpydoc.
 
 Type annotations
 ----------------
 
 While IPython itself is highly dynamic and can't be completely typed, many of
 the functions now have type annotations, and part of the codebase is now checked
 by mypy.
 
 
 Featured changes
 ----------------
 
 Here is a features list of changes in IPython 8.0. This is of course non-exhaustive. 
 Please note as well that many features have been added in the 7.x branch as well
 (and hence why you want to read the 7.x what's new notes), in particular
 features contributed by QuantStack (with respect to debugger protocol and Xeus
 Python), as well as many debugger features that I was pleased to implement as
 part of my work at QuanSight and sponsored by DE Shaw.
 
 Traceback improvements
 ~~~~~~~~~~~~~~~~~~~~~~
 
 Previously, error tracebacks for errors happening in code cells were showing a
 hash, the one used for compiling the Python AST::
 
     In [1]: def foo():
     ...:     return 3 / 0
     ...:
 
     In [2]: foo()
     ---------------------------------------------------------------------------
     ZeroDivisionError                         Traceback (most recent call last)
     <ipython-input-2-c19b6d9633cf> in <module>
     ----> 1 foo()
 
     <ipython-input-1-1595a74c32d5> in foo()
         1 def foo():
     ----> 2     return 3 / 0
         3
 
     ZeroDivisionError: division by zero
 
 The error traceback is now correctly formatted, showing the cell number in which the error happened::
 
     In [1]: def foo():
     ...:     return 3 / 0
     ...:
 
     Input In [2]: foo()
     ---------------------------------------------------------------------------
     ZeroDivisionError                         Traceback (most recent call last)
     input In [2], in <module>
     ----> 1 foo()
 
     Input In [1], in foo()
         1 def foo():
     ----> 2     return 3 / 0
 
     ZeroDivisionError: division by zero
 
 The ``stack_data`` package has been integrated, which provides smarter information in the traceback; 
 in particular it will highlight the AST node where an error occurs which can help to quickly narrow down errors.
 
 For example in the following snippet::
 
     def foo(i):
         x = [[[0]]]
         return x[0][i][0]
 
 
     def bar():
         return foo(0) + foo(
             1
         ) + foo(2)
 
 
 calling ``bar()`` would raise an ``IndexError`` on the return line of ``foo``,
 and IPython 8.0 is capable of telling you where the index error occurs::
 
 
     IndexError
     Input In [2], in <module>
     ----> 1 bar()
             ^^^^^
 
     Input In [1], in bar()
           6 def bar():
     ----> 7     return foo(0) + foo(
                                 ^^^^
           8         1
              ^^^^^^^^
           9     ) + foo(2)
              ^^^^
 
     Input In [1], in foo(i)
           1 def foo(i):
           2     x = [[[0]]]
     ----> 3     return x[0][i][0]
                        ^^^^^^^
 
 The corresponding locations marked here with ``^`` will show up highlighted in 
 the terminal and notebooks.
 
 Finally, a colon ``::`` and line number is appended after a filename in
 traceback::
 
 
     ZeroDivisionError               Traceback (most recent call last)
     File ~/error.py:4, in <module>
           1 def f():
           2     1/0
     ----> 4 f()
 
     File ~/error.py:2, in f()
           1 def f():
     ----> 2     1/0
 
 Many terminals and editors have integrations enabling you to directly jump to the
 relevant file/line when this syntax is used, so this small addition may have a high
 impact on productivity.
 
 
 Autosuggestions
 ~~~~~~~~~~~~~~~
 
 Autosuggestion is a very useful feature available in `fish <https://fishshell.com/>`__, `zsh <https://en.wikipedia.org/wiki/Z_shell>`__, and `prompt-toolkit <https://python-prompt-toolkit.readthedocs.io/en/master/pages/asking_for_input.html#auto-suggestion>`__.
 
 `Ptpython <https://github.com/prompt-toolkit/ptpython#ptpython>`__ allows users to enable this feature in
 `ptpython/config.py <https://github.com/prompt-toolkit/ptpython/blob/master/examples/ptpython_config/config.py#L90>`__.
 
 This feature allows users to accept autosuggestions with ctrl e, ctrl f,
 or right arrow as described below.
 
 1. Start ipython
 
 .. image:: ../_images/8.0/auto_suggest_1_prompt_no_text.png
 
 2. Run ``print("hello")``
 
 .. image:: ../_images/8.0/auto_suggest_2_print_hello_suggest.png
 
 3. start typing ``print`` again to see the autosuggestion
 
 .. image:: ../_images/8.0/auto_suggest_3_print_hello_suggest.png
 
 4. Press ``ctrl-f``, or ``ctrl-e``, or ``right-arrow`` to accept the suggestion
 
 .. image:: ../_images/8.0/auto_suggest_4_print_hello.png
 
 You can also complete word by word:
 
 1. Run ``def say_hello(): print("hello")``
 
 .. image:: ../_images/8.0/auto_suggest_second_prompt.png
 
 2. Start typing  the first letter if ``def`` to see the autosuggestion
 
 .. image:: ../_images/8.0/auto_suggest_d_phantom.png
 
 3. Press ``alt-f`` (or ``escape`` followed by ``f``), to accept the first word of the suggestion
 
 .. image:: ../_images/8.0/auto_suggest_def_phantom.png
 
 Importantly, this feature does not interfere with tab completion:
 
 1. After running ``def say_hello(): print("hello")``, press d
 
 .. image:: ../_images/8.0/auto_suggest_d_phantom.png
 
 2. Press Tab to start tab completion
 
 .. image:: ../_images/8.0/auto_suggest_d_completions.png
 
 3A. Press Tab again to select the first option
 
 .. image:: ../_images/8.0/auto_suggest_def_completions.png
 
 3B. Press ``alt f`` (``escape``, ``f``) to accept to accept the first word of the suggestion
 
 .. image:: ../_images/8.0/auto_suggest_def_phantom.png
 
 3C. Press ``ctrl-f`` or ``ctrl-e`` to accept the entire suggestion
 
 .. image:: ../_images/8.0/auto_suggest_match_parens.png
 
 
 Currently, autosuggestions are only shown in the emacs or vi insert editing modes:
 
 - The ctrl e, ctrl f, and alt f shortcuts work by default in emacs mode.
 - To use these shortcuts in vi insert mode, you will have to create `custom keybindings in your config.py <https://github.com/mskar/setup/commit/2892fcee46f9f80ef7788f0749edc99daccc52f4/>`__.
 
 
 Show pinfo information in ipdb using "?" and "??"
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 In IPDB, it is now possible to show the information about an object using "?"
 and "??", in much the same way that it can be done when using the IPython prompt::
 
     ipdb> partial?
     Init signature: partial(self, /, *args, **kwargs)
     Docstring:
     partial(func, *args, **keywords) - new function with partial application
     of the given arguments and keywords.
     File:           ~/.pyenv/versions/3.8.6/lib/python3.8/functools.py
     Type:           type
     Subclasses:
 
 Previously, ``pinfo`` or ``pinfo2`` command had to be used for this purpose.
 
 
 Autoreload 3 feature
 ~~~~~~~~~~~~~~~~~~~~
 
 Example: When an IPython session is run with the 'autoreload' extension loaded,
 you will now have the option '3' to select, which means the following:
 
     1. replicate all functionality from option 2
     2. autoload all new funcs/classes/enums/globals from the module when they are added
     3. autoload all newly imported funcs/classes/enums/globals from external modules
 
 Try ``%autoreload 3`` in an IPython session after running ``%load_ext autoreload``.
 
 For more information please see the following unit test : ``extensions/tests/test_autoreload.py:test_autoload_newly_added_objects``
 
 Auto formatting with black in the CLI
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 This feature was present in 7.x, but disabled by default.
 
 In 8.0, input was automatically reformatted with Black when black was installed.
 This feature has been reverted for the time being.
 You can re-enable it by setting ``TerminalInteractiveShell.autoformatter`` to ``"black"``
 
 History Range Glob feature
 ~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 Previously, when using ``%history``, users could specify either
 a range of sessions and lines, for example:
 
 .. code-block:: python
 
    ~8/1-~6/5   # see history from the first line of 8 sessions ago,
                # to the fifth line of 6 sessions ago.``
 
 Or users could specify a glob pattern:
 
 .. code-block:: python
 
    -g <pattern>  # glob ALL history for the specified pattern.
 
 However users could *not* specify both.
 
 If a user *did* specify both a range and a glob pattern,
 then the glob pattern would be used (globbing *all* history) *and the range would be ignored*.
 
 With this enhancement, if a user specifies both a range and a glob pattern, then the glob pattern will be applied to the specified range of history.
 
 Don't start a multi-line cell with sunken parenthesis
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 From now on, IPython will not ask for the next line of input when given a single
 line with more closing than opening brackets. For example, this means that if
 you (mis)type ``]]`` instead of ``[]``, a ``SyntaxError`` will show up, instead of
 the ``...:`` prompt continuation.
 
 IPython shell for ipdb interact
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 The ipdb ``interact`` starts an IPython shell instead of Python's built-in ``code.interact()``.
 
 Automatic Vi prompt stripping
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 When pasting code into IPython, it will strip the leading prompt characters if
 there are any. For example, you can paste the following code into the console -
 it will still work, even though each line is prefixed with prompts (``In``,
 ``Out``)::
 
     In [1]: 2 * 2 == 4
     Out[1]: True
 
     In [2]: print("This still works as pasted")
 
 
 Previously, this was not the case for the Vi-mode prompts::
 
     In [1]: [ins] In [13]: 2 * 2 == 4
        ...: Out[13]: True
        ...:
       File "<ipython-input-1-727bb88eaf33>", line 1
         [ins] In [13]: 2 * 2 == 4
               ^
     SyntaxError: invalid syntax
 
 This is now fixed, and Vi prompt prefixes - ``[ins]`` and ``[nav]`` -  are
 skipped just as the normal ``In`` would be.
 
 IPython shell can be started in the Vi mode using ``ipython --TerminalInteractiveShell.editing_mode=vi``, 
 You should be able to change mode dynamically with ``%config TerminalInteractiveShell.editing_mode='vi'``
 
 Empty History Ranges
 ~~~~~~~~~~~~~~~~~~~~
 
 A number of magics that take history ranges can now be used with an empty
 range. These magics are:
 
  * ``%save``
  * ``%load``
  * ``%pastebin``
  * ``%pycat``
 
 Using them this way will make them take the history of the current session up
 to the point of the magic call (such that the magic itself will not be
 included).
 
 Therefore it is now possible to save the whole history to a file using
 ``%save <filename>``, load and edit it using ``%load`` (makes for a nice usage
 when followed with :kbd:`F2`), send it to `dpaste.org <http://dpast.org>`_ using
 ``%pastebin``, or view the whole thing syntax-highlighted with a single
 ``%pycat``.
 
 
 Windows timing implementation: Switch to process_time
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 Timing on Windows, for example with ``%%time``,  was changed from being based on ``time.perf_counter`` 
 (which counted time even when the process was sleeping) to being based on ``time.process_time`` instead 
 (which only counts CPU time). This brings it closer to the behavior on Linux. See :ghpull:`12984`.
 
 Miscellaneous
 ~~~~~~~~~~~~~
  - Non-text formatters are not disabled in the terminal, which should simplify
    writing extensions displaying images or other mimetypes in supporting terminals.
    :ghpull:`12315`
  - It is now possible to automatically insert matching brackets in Terminal IPython using the
    ``TerminalInteractiveShell.auto_match=True`` option. :ghpull:`12586`
  - We are thinking of deprecating the current ``%%javascript`` magic in favor of a better replacement. See :ghpull:`13376`.
  - ``~`` is now expanded when part of a path in most magics :ghpull:`13385`
  - ``%/%%timeit`` magic now adds a comma every thousands to make reading a long number easier :ghpull:`13379`
  - ``"info"`` messages can now be customised to hide some fields :ghpull:`13343`
  - ``collections.UserList`` now pretty-prints :ghpull:`13320`
  - The debugger now has a persistent history, which should make it less
    annoying to retype commands :ghpull:`13246`
  - ``!pip`` ``!conda`` ``!cd`` or ``!ls`` are likely doing the wrong thing. We
    now warn users if they use one of those commands. :ghpull:`12954`
  - Make ``%precision`` work for ``numpy.float64`` type :ghpull:`12902`
 
 Re-added support for XDG config directories
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 XDG support through the years comes and goes. There is a tension between having
 an identical location for configuration in all platforms versus having simple instructions. 
 After initial failures a couple of years ago, IPython was modified to automatically migrate XDG
 config files back into ``~/.ipython``. That migration code has now been removed.
 IPython now checks the XDG locations, so if you _manually_ move your config
 files to your preferred location, IPython will not move them back.
 
 
 Preparing for Python 3.10
 -------------------------
 
 To prepare for Python 3.10, we have started working on removing reliance and
 any dependency that is not compatible with Python 3.10. This includes migrating our
 test suite to pytest and starting to remove nose. This also means that the
 ``iptest`` command is now gone and all testing is via pytest.
 
 This was in large part thanks to the NumFOCUS Small Developer grant, which enabled us to
 allocate \$4000 to hire `Nikita Kniazev (@Kojoley) <https://github.com/Kojoley>`_,
 who did a fantastic job at updating our code base, migrating to pytest, pushing
 our coverage, and fixing a large number of bugs. I highly recommend contacting
 them if you need help with C++ and Python projects.
 
 You can find all relevant issues and PRs with `the SDG 2021 tag <https://github.com/ipython/ipython/issues?q=label%3A%22Numfocus+SDG+2021%22+>`__
 
 Removing support for older Python versions
 ------------------------------------------
 
 
 We are removing support for Python up through 3.7, allowing internal code to use the more
 efficient ``pathlib`` and to make better use of type annotations. 
 
 .. image:: ../_images/8.0/pathlib_pathlib_everywhere.jpg
    :alt: "Meme image of Toy Story with Woody and Buzz, with the text 'pathlib, pathlib everywhere'"
 
 
 We had about 34 PRs only to update some logic to update some functions from managing strings to
 using Pathlib.
 
 The completer has also seen significant updates and now makes use of newer Jedi APIs,
 offering faster and more reliable tab completion.
 
 Misc Statistics
 ---------------
 
 Here are some numbers::
 
     7.x: 296 files, 12561 blank lines, 20282 comments, 35142 line of code.
     8.0: 252 files, 12053 blank lines, 19232 comments, 34505 line of code.
 
     $ git diff --stat 7.x...master  | tail -1
     340 files changed, 13399 insertions(+), 12421 deletions(-)
 
 We have commits from 162 authors, who contributed 1916 commits in 23 month, excluding merges (to not bias toward
 maintainers pushing buttons).::
 
    $ git shortlog  -s --no-merges  7.x...master | sort -nr
    535	Matthias Bussonnier
     86	Nikita Kniazev
     69	Blazej Michalik
     49	Samuel Gaist
     27	Itamar Turner-Trauring
     18	Spas Kalaydzhisyki
     17	Thomas Kluyver
     17	Quentin Peter
     17	James Morris
     17	Artur Svistunov
     15	Bart Skowron
     14	Alex Hall
     13	rushabh-v
     13	Terry Davis
     13	Benjamin Ragan-Kelley
      8	martinRenou
      8	farisachugthai
      7	dswij
      7	Gal B
      7	Corentin Cadiou
      6	yuji96
      6	Martin Skarzynski
      6	Justin Palmer
      6	Daniel Goldfarb
      6	Ben Greiner
      5	Sammy Al Hashemi
      5	Paul Ivanov
      5	Inception95
      5	Eyenpi
      5	Douglas Blank
      5	Coco Mishra
      5	Bibo Hao
      5	André A. Gomes
      5	Ahmed Fasih
      4	takuya fujiwara
      4	palewire
      4	Thomas A Caswell
      4	Talley Lambert
      4	Scott Sanderson
      4	Ram Rachum
      4	Nick Muoh
      4	Nathan Goldbaum
      4	Mithil Poojary
      4	Michael T
      4	Jakub Klus
      4	Ian Castleden
      4	Eli Rykoff
      4	Ashwin Vishnu
      3	谭九鼎
      3	sleeping
      3	Sylvain Corlay
      3	Peter Corke
      3	Paul Bissex
      3	Matthew Feickert
      3	Fernando Perez
      3	Eric Wieser
      3	Daniel Mietchen
      3	Aditya Sathe
      3	007vedant
      2	rchiodo
      2	nicolaslazo
      2	luttik
      2	gorogoroumaru
      2	foobarbyte
      2	bar-hen
      2	Theo Ouzhinski
      2	Strawkage
      2	Samreen Zarroug
      2	Pete Blois
      2	Meysam Azad
      2	Matthieu Ancellin
      2	Mark Schmitz
      2	Maor Kleinberger
      2	MRCWirtz
      2	Lumir Balhar
      2	Julien Rabinow
      2	Juan Luis Cano Rodríguez
      2	Joyce Er
      2	Jakub
      2	Faris A Chugthai
      2	Ethan Madden
      2	Dimitri Papadopoulos
      2	Diego Fernandez
      2	Daniel Shimon
      2	Coco Bennett
      2	Carlos Cordoba
      2	Boyuan Liu
      2	BaoGiang HoangVu
      2	Augusto
      2	Arthur Svistunov
      2	Arthur Moreira
      2	Ali Nabipour
      2	Adam Hackbarth
      1	richard
      1	linar-jether
      1	lbennett
      1	juacrumar
      1	gpotter2
      1	digitalvirtuoso
      1	dalthviz
      1	Yonatan Goldschmidt
      1	Tomasz Kłoczko
      1	Tobias Bengfort
      1	Timur Kushukov
      1	Thomas
      1	Snir Broshi
      1	Shao Yang Hong
      1	Sanjana-03
      1	Romulo Filho
      1	Rodolfo Carvalho
      1	Richard Shadrach
      1	Reilly Tucker Siemens
      1	Rakessh Roshan
      1	Piers Titus van der Torren
      1	PhanatosZou
      1	Pavel Safronov
      1	Paulo S. Costa
      1	Paul McCarthy
      1	NotWearingPants
      1	Naelson Douglas
      1	Michael Tiemann
      1	Matt Wozniski
      1	Markus Wageringel
      1	Marcus Wirtz
      1	Marcio Mazza
      1	Lumír 'Frenzy' Balhar
      1	Lightyagami1
      1	Leon Anavi
      1	LeafyLi
      1	L0uisJ0shua
      1	Kyle Cutler
      1	Krzysztof Cybulski
      1	Kevin Kirsche
      1	KIU Shueng Chuan
      1	Jonathan Slenders
      1	Jay Qi
      1	Jake VanderPlas
      1	Iwan Briquemont
      1	Hussaina Begum Nandyala
      1	Gordon Ball
      1	Gabriel Simonetto
      1	Frank Tobia
      1	Erik
      1	Elliott Sales de Andrade
      1	Daniel Hahler
      1	Dan Green-Leipciger
      1	Dan Green
      1	Damian Yurzola
      1	Coon, Ethan T
      1	Carol Willing
      1	Brian Lee
      1	Brendan Gerrity
      1	Blake Griffin
      1	Bastian Ebeling
      1	Bartosz Telenczuk
      1	Ankitsingh6299
      1	Andrew Port
      1	Andrew J. Hesford
      1	Albert Zhang
      1	Adam Johnson
 
 This does not, of course, represent non-code contributions, for which we are also grateful.
 
 
 API Changes using Frappuccino
 -----------------------------
 
 This is an experimental exhaustive API difference using `Frappuccino <https://pypi.org/project/frappuccino/>`_
 
 
 The following items are new in IPython 8.0 ::
 
     + IPython.core.async_helpers.get_asyncio_loop()
     + IPython.core.completer.Dict
     + IPython.core.completer.Pattern
     + IPython.core.completer.Sequence
     + IPython.core.completer.__skip_doctest__
     + IPython.core.debugger.Pdb.precmd(self, line)
     + IPython.core.debugger.__skip_doctest__
     + IPython.core.display.__getattr__(name)
     + IPython.core.display.warn
     + IPython.core.display_functions
     + IPython.core.display_functions.DisplayHandle
     + IPython.core.display_functions.DisplayHandle.display(self, obj, **kwargs)
     + IPython.core.display_functions.DisplayHandle.update(self, obj, **kwargs)
     + IPython.core.display_functions.__all__
     + IPython.core.display_functions.__builtins__
     + IPython.core.display_functions.__cached__
     + IPython.core.display_functions.__doc__
     + IPython.core.display_functions.__file__
     + IPython.core.display_functions.__loader__
     + IPython.core.display_functions.__name__
     + IPython.core.display_functions.__package__
     + IPython.core.display_functions.__spec__
     + IPython.core.display_functions.b2a_hex
     + IPython.core.display_functions.clear_output(wait=False)
     + IPython.core.display_functions.display(*objs, include='None', exclude='None', metadata='None', transient='None', display_id='None', raw=False, clear=False, **kwargs)
     + IPython.core.display_functions.publish_display_data(data, metadata='None', source='<deprecated>', *, transient='None', **kwargs)
     + IPython.core.display_functions.update_display(obj, *, display_id, **kwargs)
     + IPython.core.extensions.BUILTINS_EXTS
     + IPython.core.inputtransformer2.has_sunken_brackets(tokens)
     + IPython.core.interactiveshell.Callable
     + IPython.core.interactiveshell.__annotations__
     + IPython.core.ultratb.List
     + IPython.core.ultratb.Tuple
     + IPython.lib.pretty.CallExpression
     + IPython.lib.pretty.CallExpression.factory(name)
     + IPython.lib.pretty.RawStringLiteral
     + IPython.lib.pretty.RawText
     + IPython.terminal.debugger.TerminalPdb.do_interact(self, arg)
     + IPython.terminal.embed.Set
 
 The following items have been removed (or moved to superclass)::
 
     - IPython.core.application.BaseIPythonApplication.initialize_subcommand
     - IPython.core.completer.Sentinel
     - IPython.core.completer.skip_doctest
     - IPython.core.debugger.Tracer
     - IPython.core.display.DisplayHandle
     - IPython.core.display.DisplayHandle.display
     - IPython.core.display.DisplayHandle.update
     - IPython.core.display.b2a_hex
     - IPython.core.display.clear_output
     - IPython.core.display.display
     - IPython.core.display.publish_display_data
     - IPython.core.display.update_display
     - IPython.core.excolors.Deprec
     - IPython.core.excolors.ExceptionColors
     - IPython.core.history.warn
     - IPython.core.hooks.late_startup_hook
     - IPython.core.hooks.pre_run_code_hook
     - IPython.core.hooks.shutdown_hook
     - IPython.core.interactiveshell.InteractiveShell.init_deprecation_warnings
     - IPython.core.interactiveshell.InteractiveShell.init_readline
     - IPython.core.interactiveshell.InteractiveShell.write
     - IPython.core.interactiveshell.InteractiveShell.write_err
     - IPython.core.interactiveshell.get_default_colors
     - IPython.core.interactiveshell.removed_co_newlocals
     - IPython.core.magics.execution.ExecutionMagics.profile_missing_notice
     - IPython.core.magics.script.PIPE
     - IPython.core.prefilter.PrefilterManager.init_transformers
     - IPython.core.release.classifiers
     - IPython.core.release.description
     - IPython.core.release.keywords
     - IPython.core.release.long_description
     - IPython.core.release.name
     - IPython.core.release.platforms
     - IPython.core.release.url
     - IPython.core.ultratb.VerboseTB.format_records
     - IPython.core.ultratb.find_recursion
     - IPython.core.ultratb.findsource
     - IPython.core.ultratb.fix_frame_records_filenames
     - IPython.core.ultratb.inspect_error
     - IPython.core.ultratb.is_recursion_error
     - IPython.core.ultratb.with_patch_inspect
     - IPython.external.__all__
     - IPython.external.__builtins__
     - IPython.external.__cached__
     - IPython.external.__doc__
     - IPython.external.__file__
     - IPython.external.__loader__
     - IPython.external.__name__
     - IPython.external.__package__
     - IPython.external.__path__
     - IPython.external.__spec__
     - IPython.kernel.KernelConnectionInfo
     - IPython.kernel.__builtins__
     - IPython.kernel.__cached__
     - IPython.kernel.__warningregistry__
     - IPython.kernel.pkg
     - IPython.kernel.protocol_version
     - IPython.kernel.protocol_version_info
     - IPython.kernel.src
     - IPython.kernel.version_info
     - IPython.kernel.warn
     - IPython.lib.backgroundjobs
     - IPython.lib.backgroundjobs.BackgroundJobBase
     - IPython.lib.backgroundjobs.BackgroundJobBase.run
     - IPython.lib.backgroundjobs.BackgroundJobBase.traceback
     - IPython.lib.backgroundjobs.BackgroundJobExpr
     - IPython.lib.backgroundjobs.BackgroundJobExpr.call
     - IPython.lib.backgroundjobs.BackgroundJobFunc
     - IPython.lib.backgroundjobs.BackgroundJobFunc.call
     - IPython.lib.backgroundjobs.BackgroundJobManager
     - IPython.lib.backgroundjobs.BackgroundJobManager.flush
     - IPython.lib.backgroundjobs.BackgroundJobManager.new
     - IPython.lib.backgroundjobs.BackgroundJobManager.remove
     - IPython.lib.backgroundjobs.BackgroundJobManager.result
     - IPython.lib.backgroundjobs.BackgroundJobManager.status
     - IPython.lib.backgroundjobs.BackgroundJobManager.traceback
     - IPython.lib.backgroundjobs.__builtins__
     - IPython.lib.backgroundjobs.__cached__
     - IPython.lib.backgroundjobs.__doc__
     - IPython.lib.backgroundjobs.__file__
     - IPython.lib.backgroundjobs.__loader__
     - IPython.lib.backgroundjobs.__name__
     - IPython.lib.backgroundjobs.__package__
     - IPython.lib.backgroundjobs.__spec__
     - IPython.lib.kernel.__builtins__
     - IPython.lib.kernel.__cached__
     - IPython.lib.kernel.__doc__
     - IPython.lib.kernel.__file__
     - IPython.lib.kernel.__loader__
     - IPython.lib.kernel.__name__
     - IPython.lib.kernel.__package__
     - IPython.lib.kernel.__spec__
     - IPython.lib.kernel.__warningregistry__
     - IPython.paths.fs_encoding
     - IPython.terminal.debugger.DEFAULT_BUFFER
     - IPython.terminal.debugger.cursor_in_leading_ws
     - IPython.terminal.debugger.emacs_insert_mode
     - IPython.terminal.debugger.has_selection
     - IPython.terminal.debugger.vi_insert_mode
     - IPython.terminal.interactiveshell.DISPLAY_BANNER_DEPRECATED
     - IPython.terminal.ipapp.TerminalIPythonApp.parse_command_line
     - IPython.testing.test
     - IPython.utils.contexts.NoOpContext
     - IPython.utils.io.IOStream
     - IPython.utils.io.IOStream.close
     - IPython.utils.io.IOStream.write
     - IPython.utils.io.IOStream.writelines
     - IPython.utils.io.__warningregistry__
     - IPython.utils.io.atomic_writing
     - IPython.utils.io.stderr
     - IPython.utils.io.stdin
     - IPython.utils.io.stdout
     - IPython.utils.io.unicode_std_stream
     - IPython.utils.path.get_ipython_cache_dir
     - IPython.utils.path.get_ipython_dir
     - IPython.utils.path.get_ipython_module_path
     - IPython.utils.path.get_ipython_package_dir
     - IPython.utils.path.locate_profile
     - IPython.utils.path.unquote_filename
     - IPython.utils.py3compat.PY2
     - IPython.utils.py3compat.PY3
     - IPython.utils.py3compat.buffer_to_bytes
     - IPython.utils.py3compat.builtin_mod_name
     - IPython.utils.py3compat.cast_bytes
     - IPython.utils.py3compat.getcwd
     - IPython.utils.py3compat.isidentifier
     - IPython.utils.py3compat.u_format
 
 The following signatures differ between 7.x and 8.0::
 
     - IPython.core.completer.IPCompleter.unicode_name_matches(self, text)
     + IPython.core.completer.IPCompleter.unicode_name_matches(text)
 
     - IPython.core.completer.match_dict_keys(keys, prefix, delims)
     + IPython.core.completer.match_dict_keys(keys, prefix, delims, extra_prefix='None')
 
     - IPython.core.interactiveshell.InteractiveShell.object_inspect_mime(self, oname, detail_level=0)
     + IPython.core.interactiveshell.InteractiveShell.object_inspect_mime(self, oname, detail_level=0, omit_sections='()')
 
     - IPython.core.interactiveshell.InteractiveShell.set_hook(self, name, hook, priority=50, str_key='None', re_key='None', _warn_deprecated=True)
     + IPython.core.interactiveshell.InteractiveShell.set_hook(self, name, hook, priority=50, str_key='None', re_key='None')
 
     - IPython.core.oinspect.Inspector.info(self, obj, oname='', formatter='None', info='None', detail_level=0)
     + IPython.core.oinspect.Inspector.info(self, obj, oname='', info='None', detail_level=0)
 
     - IPython.core.oinspect.Inspector.pinfo(self, obj, oname='', formatter='None', info='None', detail_level=0, enable_html_pager=True)
     + IPython.core.oinspect.Inspector.pinfo(self, obj, oname='', formatter='None', info='None', detail_level=0, enable_html_pager=True, omit_sections='()')
 
     - IPython.core.profiledir.ProfileDir.copy_config_file(self, config_file, path='None', overwrite=False)
     + IPython.core.profiledir.ProfileDir.copy_config_file(self, config_file, path, overwrite=False)
 
     - IPython.core.ultratb.VerboseTB.format_record(self, frame, file, lnum, func, lines, index)
     + IPython.core.ultratb.VerboseTB.format_record(self, frame_info)
 
     - IPython.terminal.embed.InteractiveShellEmbed.mainloop(self, local_ns='None', module='None', stack_depth=0, display_banner='None', global_ns='None', compile_flags='None')
     + IPython.terminal.embed.InteractiveShellEmbed.mainloop(self, local_ns='None', module='None', stack_depth=0, compile_flags='None')
 
     - IPython.terminal.embed.embed(**kwargs)
     + IPython.terminal.embed.embed(*, header='', compile_flags='None', **kwargs)
 
     - IPython.terminal.interactiveshell.TerminalInteractiveShell.interact(self, display_banner='<object object at 0xffffff>')
     + IPython.terminal.interactiveshell.TerminalInteractiveShell.interact(self)
 
     - IPython.terminal.interactiveshell.TerminalInteractiveShell.mainloop(self, display_banner='<object object at 0xffffff>')
     + IPython.terminal.interactiveshell.TerminalInteractiveShell.mainloop(self)
 
     - IPython.utils.path.get_py_filename(name, force_win32='None')
     + IPython.utils.path.get_py_filename(name)
 
 The following are new attributes (that might be inherited)::
 
     + IPython.core.completer.IPCompleter.unicode_names
     + IPython.core.debugger.InterruptiblePdb.precmd
     + IPython.core.debugger.Pdb.precmd
     + IPython.core.ultratb.AutoFormattedTB.has_colors
     + IPython.core.ultratb.ColorTB.has_colors
     + IPython.core.ultratb.FormattedTB.has_colors
     + IPython.core.ultratb.ListTB.has_colors
     + IPython.core.ultratb.SyntaxTB.has_colors
     + IPython.core.ultratb.TBTools.has_colors
     + IPython.core.ultratb.VerboseTB.has_colors
     + IPython.terminal.debugger.TerminalPdb.do_interact
     + IPython.terminal.debugger.TerminalPdb.precmd
 
 The following attribute/methods have been removed::
 
     - IPython.core.application.BaseIPythonApplication.deprecated_subcommands
     - IPython.core.ultratb.AutoFormattedTB.format_records
     - IPython.core.ultratb.ColorTB.format_records
     - IPython.core.ultratb.FormattedTB.format_records
     - IPython.terminal.embed.InteractiveShellEmbed.init_deprecation_warnings
     - IPython.terminal.embed.InteractiveShellEmbed.init_readline
     - IPython.terminal.embed.InteractiveShellEmbed.write
     - IPython.terminal.embed.InteractiveShellEmbed.write_err
     - IPython.terminal.interactiveshell.TerminalInteractiveShell.init_deprecation_warnings
     - IPython.terminal.interactiveshell.TerminalInteractiveShell.init_readline
     - IPython.terminal.interactiveshell.TerminalInteractiveShell.write
     - IPython.terminal.interactiveshell.TerminalInteractiveShell.write_err
     - IPython.terminal.ipapp.LocateIPythonApp.deprecated_subcommands
     - IPython.terminal.ipapp.LocateIPythonApp.initialize_subcommand
     - IPython.terminal.ipapp.TerminalIPythonApp.deprecated_subcommands
     - IPython.terminal.ipapp.TerminalIPythonApp.initialize_subcommand

setup.cfg

@@ -1,116 +1,115 b''
 [metadata]
 name = ipython
 version = attr: IPython.core.release.__version__
 url = https://ipython.org
 description = IPython: Productive Interactive Computing
 long_description_content_type = text/x-rst
 long_description = file: long_description.rst
 license_file = LICENSE
 project_urls =
     Documentation = https://ipython.readthedocs.io/
     Funding = https://numfocus.org/
     Source = https://github.com/ipython/ipython
     Tracker = https://github.com/ipython/ipython/issues
 keywords = Interactive, Interpreter, Shell, Embedding
 platforms = Linux, Mac OSX, Windows
 classifiers =
     Framework :: IPython
     Framework :: Jupyter
     Intended Audience :: Developers
     Intended Audience :: Science/Research
     License :: OSI Approved :: BSD License
     Programming Language :: Python
     Programming Language :: Python :: 3
     Programming Language :: Python :: 3 :: Only
     Topic :: System :: Shells
 
 [options]
 packages = find:
 python_requires = >=3.8
 zip_safe = False
 install_requires =
     appnope; sys_platform == "darwin"
     backcall
     colorama; sys_platform == "win32"
     decorator
     jedi>=0.16
     matplotlib-inline
     pexpect>4.3; sys_platform != "win32"
     pickleshare
     prompt_toolkit>3.0.1,<3.1.0
     pygments>=2.4.0
-    setuptools>=18.5
     stack_data
     traitlets>=5
 
 [options.extras_require]
 black =
     black
 doc =
     Sphinx>=1.3
 kernel =
     ipykernel
 nbconvert =
     nbconvert
 nbformat =
     nbformat
 notebook =
     ipywidgets
     notebook
 parallel =
     ipyparallel
 qtconsole =
     qtconsole
 terminal =
 test =
     pytest<7.1
     pytest-asyncio
     testpath
 test_extra =
     %(test)s
     curio
     matplotlib!=3.2.0
     nbformat
     numpy>=1.19
     pandas
     trio
     typing_extensions
 all =
     %(black)s
     %(doc)s
     %(kernel)s
     %(nbconvert)s
     %(nbformat)s
     %(notebook)s
     %(parallel)s
     %(qtconsole)s
     %(terminal)s
     %(test_extra)s
     %(test)s
 
 [options.packages.find]
 exclude =
     setupext
 
 [options.package_data]
 IPython.core = profile/README*
 IPython.core.tests = *.png, *.jpg, daft_extension/*.py
 IPython.lib.tests = *.wav
 IPython.testing.plugin = *.txt
 
 [options.entry_points]
 console_scripts =
     ipython = IPython:start_ipython
     ipython3 = IPython:start_ipython
 pygments.lexers =
     ipythonconsole = IPython.lib.lexers:IPythonConsoleLexer
     ipython = IPython.lib.lexers:IPythonLexer
     ipython3 = IPython.lib.lexers:IPython3Lexer
 
 [velin]
 ignore_patterns =
    IPython/core/tests
    IPython/testing
 
 [tool.black]
 exclude = 'timing\.py'

tools/github_stats.py

@@ -1,230 +1,230 b''
 #!/usr/bin/env python
 """Simple tools to query github.com and gather stats about issues.
 
 To generate a report for IPython 2.0, run:
 
     python github_stats.py --milestone 2.0 --since-tag rel-1.0.0
 """
 #-----------------------------------------------------------------------------
 # Imports
 #-----------------------------------------------------------------------------
 
 
 import sys
 
 from argparse import ArgumentParser
 from datetime import datetime, timedelta
 from subprocess import check_output
 
 from gh_api import (
     get_paged_request, make_auth_header, get_pull_request, is_pull_request,
     get_milestone_id, get_issues_list, get_authors,
 )
 #-----------------------------------------------------------------------------
 # Globals
 #-----------------------------------------------------------------------------
 
 ISO8601 = "%Y-%m-%dT%H:%M:%SZ"
 PER_PAGE = 100
 
 #-----------------------------------------------------------------------------
 # Functions
 #-----------------------------------------------------------------------------
 
 def round_hour(dt):
     return dt.replace(minute=0,second=0,microsecond=0)
 
 def _parse_datetime(s):
     """Parse dates in the format returned by the Github API."""
     if s:
         return datetime.strptime(s, ISO8601)
     else:
         return datetime.fromtimestamp(0)
 
 def issues2dict(issues):
     """Convert a list of issues to a dict, keyed by issue number."""
     idict = {}
     for i in issues:
         idict[i['number']] = i
     return idict
 
 def split_pulls(all_issues, project="ipython/ipython"):
     """split a list of closed issues into non-PR Issues and Pull Requests"""
     pulls = []
     issues = []
     for i in all_issues:
         if is_pull_request(i):
             pull = get_pull_request(project, i['number'], auth=True)
             pulls.append(pull)
         else:
             issues.append(i)
     return issues, pulls
 
 
 def issues_closed_since(period=timedelta(days=365), project="ipython/ipython", pulls=False):
     """Get all issues closed since a particular point in time. period
     can either be a datetime object, or a timedelta object. In the
     latter case, it is used as a time before the present.
     """
 
     which = 'pulls' if pulls else 'issues'
 
     if isinstance(period, timedelta):
         since = round_hour(datetime.utcnow() - period)
     else:
         since = period
     url = "https://api.github.com/repos/%s/%s?state=closed&sort=updated&since=%s&per_page=%i" % (project, which, since.strftime(ISO8601), PER_PAGE)
     allclosed = get_paged_request(url, headers=make_auth_header())
     
     filtered = [ i for i in allclosed if _parse_datetime(i['closed_at']) > since ]
     if pulls:
         filtered = [ i for i in filtered if _parse_datetime(i['merged_at']) > since ]
         # filter out PRs not against main (backports)
-        filtered = [ i for i in filtered if i['base']['ref'] == 'main' ]
+        filtered = [i for i in filtered if i["base"]["ref"] == "main"]
     else:
         filtered = [ i for i in filtered if not is_pull_request(i) ]
     
     return filtered
 
 
 def sorted_by_field(issues, field='closed_at', reverse=False):
     """Return a list of issues sorted by closing date date."""
     return sorted(issues, key = lambda i:i[field], reverse=reverse)
 
 
 def report(issues, show_urls=False):
     """Summary report about a list of issues, printing number and title."""
     if show_urls:
         for i in issues:
             role = 'ghpull' if 'merged_at' in i else 'ghissue'
             print(u'* :%s:`%d`: %s' % (role, i['number'],
                                         i['title'].replace(u'`', u'``')))
     else:
         for i in issues:
             print(u'* %d: %s' % (i['number'], i['title'].replace(u'`', u'``')))
 
 #-----------------------------------------------------------------------------
 # Main script
 #-----------------------------------------------------------------------------
 
 if __name__ == "__main__":
 
     print("DEPRECATE: backport_pr.py is deprecated and it is now recommended"
           "to install `ghpro` from PyPI.", file=sys.stderr)
 
     
     # Whether to add reST urls for all issues in printout.
     show_urls = True
     
     parser = ArgumentParser()
     parser.add_argument('--since-tag', type=str,
         help="The git tag to use for the starting point (typically the last major release)."
     )
     parser.add_argument('--milestone', type=str,
         help="The GitHub milestone to use for filtering issues [optional]."
     )
     parser.add_argument('--days', type=int,
         help="The number of days of data to summarize (use this or --since-tag)."
     )
     parser.add_argument('--project', type=str, default="ipython/ipython",
         help="The project to summarize."
     )
     parser.add_argument('--links', action='store_true', default=False,
         help="Include links to all closed Issues and PRs in the output."
     )
     
     opts = parser.parse_args()
     tag = opts.since_tag
     
     # set `since` from days or git tag
     if opts.days:
         since = datetime.utcnow() - timedelta(days=opts.days)
     else:
         if not tag:
             tag = check_output(['git', 'describe', '--abbrev=0']).strip().decode('utf8')
         cmd = ['git', 'log', '-1', '--format=%ai', tag]
         tagday, tz = check_output(cmd).strip().decode('utf8').rsplit(' ', 1)
         since = datetime.strptime(tagday, "%Y-%m-%d %H:%M:%S")
         h = int(tz[1:3])
         m = int(tz[3:])
         td = timedelta(hours=h, minutes=m)
         if tz[0] == '-':
             since += td
         else:
             since -= td
     
     since = round_hour(since)
     
     milestone = opts.milestone
     project = opts.project
 
     print("fetching GitHub stats since %s (tag: %s, milestone: %s)" % (since, tag, milestone), file=sys.stderr)
     if milestone:
         milestone_id = get_milestone_id(project=project, milestone=milestone,
                 auth=True)
         issues_and_pulls = get_issues_list(project=project,
                 milestone=milestone_id,
                 state='closed',
                 auth=True,
         )
         issues, pulls = split_pulls(issues_and_pulls, project=project)
     else:
         issues = issues_closed_since(since, project=project, pulls=False)
         pulls = issues_closed_since(since, project=project, pulls=True)
     
     # For regular reports, it's nice to show them in reverse chronological order
     issues = sorted_by_field(issues, reverse=True)
     pulls = sorted_by_field(pulls, reverse=True)
     
     n_issues, n_pulls = map(len, (issues, pulls))
     n_total = n_issues + n_pulls
     
     # Print summary report we can directly include into release notes.
     
     print()
     since_day = since.strftime("%Y/%m/%d")
     today = datetime.today().strftime("%Y/%m/%d")
     print("GitHub stats for %s - %s (tag: %s)" % (since_day, today, tag))
     print()
     print("These lists are automatically generated, and may be incomplete or contain duplicates.")
     print()
     
     ncommits = 0
     all_authors = []
     if tag:
         # print git info, in addition to GitHub info:
         since_tag = tag+'..'
         cmd = ['git', 'log', '--oneline', since_tag]
         ncommits += len(check_output(cmd).splitlines())
         
         author_cmd = ['git', 'log', '--use-mailmap', "--format=* %aN", since_tag]
         all_authors.extend(check_output(author_cmd).decode('utf-8', 'replace').splitlines())
     
     pr_authors = []
     for pr in pulls:
         pr_authors.extend(get_authors(pr))
     ncommits = len(pr_authors) + ncommits - len(pulls)
     author_cmd = ['git', 'check-mailmap'] + pr_authors
     with_email = check_output(author_cmd).decode('utf-8', 'replace').splitlines()
     all_authors.extend([ u'* ' + a.split(' <')[0] for a in with_email ])
     unique_authors = sorted(set(all_authors), key=lambda s: s.lower())
 
     print("We closed %d issues and merged %d pull requests." % (n_issues, n_pulls))
     if milestone:
         print("The full list can be seen `on GitHub <https://github.com/{project}/issues?q=milestone%3A{milestone}>`__".format(project=project,milestone=milestone)
         )
     
     print()
     print("The following %i authors contributed %i commits." % (len(unique_authors), ncommits))
     print()
     print('\n'.join(unique_authors))
     
     if opts.links:
         print()
         print("GitHub issues and pull requests:")
         print()
         print('Pull Requests (%d):\n' % n_pulls)
         report(pulls, show_urls)
         print()
         print('Issues (%d):\n' % n_issues)
         report(issues, show_urls)