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making prompt_tolkit history search configurable
making prompt_tolkit history search configurable

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interactiveshell.py
542 lines | 20.7 KiB | text/x-python | PythonLexer
"""IPython terminal interface using prompt_toolkit"""
import os
import sys
import warnings
from warnings import warn
from IPython.core.interactiveshell import InteractiveShell, InteractiveShellABC
from IPython.utils import io
from IPython.utils.py3compat import input
from IPython.utils.terminal import toggle_set_term_title, set_term_title
from IPython.utils.process import abbrev_cwd
from traitlets import (
Bool, Unicode, Dict, Integer, observe, Instance, Type, default, Enum, Union,
Any,
)
from prompt_toolkit.document import Document
from prompt_toolkit.enums import DEFAULT_BUFFER, EditingMode
from prompt_toolkit.filters import (HasFocus, Condition, IsDone)
from prompt_toolkit.history import InMemoryHistory
from prompt_toolkit.shortcuts import create_prompt_application, create_eventloop, create_prompt_layout, create_output
from prompt_toolkit.interface import CommandLineInterface
from prompt_toolkit.key_binding.manager import KeyBindingManager
from prompt_toolkit.layout.processors import ConditionalProcessor, HighlightMatchingBracketProcessor
from prompt_toolkit.styles import PygmentsStyle, DynamicStyle
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 register_ipython_shortcuts
DISPLAY_BANNER_DEPRECATED = object()
class _NoStyle(Style): pass
_style_overrides_light_bg = {
Token.Prompt: '#0000ff',
Token.PromptNum: '#0000ee bold',
Token.OutPrompt: '#cc0000',
Token.OutPromptNum: '#bb0000 bold',
}
_style_overrides_linux = {
Token.Prompt: '#00cc00',
Token.PromptNum: '#00bb00 bold',
Token.OutPrompt: '#cc0000',
Token.OutPromptNum: '#bb0000 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():
_is_tty = False
break
else:
_is_tty = True
_use_simple_prompt = ('IPY_TEST_SIMPLE_PROMPT' in os.environ) or (not _is_tty)
class TerminalInteractiveShell(InteractiveShell):
space_for_menu = Integer(6, help='Number of line at the bottom of the screen '
'to reserve for the completion menu'
).tag(config=True)
def _space_for_menu_changed(self, old, new):
self._update_layout()
pt_cli = None
debugger_history = None
_pt_app = None
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)
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)
@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)
@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 init_display_formatter(self):
super(TerminalInteractiveShell, self).init_display_formatter()
# terminal only supports plain text
self.display_formatter.active_types = ['text/plain']
# disable `_ipython_display_`
self.display_formatter.ipython_display_formatter.enabled = False
def init_prompt_toolkit_cli(self):
if self.simple_prompt:
# Fall back to plain non-interactive output for tests.
# This is very limited, and only accepts a single line.
def prompt():
isp = self.input_splitter
prompt_text = "".join(x[1] for x in self.prompts.in_prompt_tokens())
prompt_continuation = "".join(x[1] for x in self.prompts.continuation_prompt_tokens())
while isp.push_accepts_more():
line = input(prompt_text)
isp.push(line)
prompt_text = prompt_continuation
return isp.source_reset()
self.prompt_for_code = prompt
return
# Set up keyboard shortcuts
kbmanager = KeyBindingManager.for_prompt(
enable_open_in_editor=self.extra_open_editor_shortcuts,
)
register_ipython_shortcuts(kbmanager.registry, self)
# Pre-populate history from IPython's history database
history = InMemoryHistory()
last_cell = u""
for __, ___, cell in self.history_manager.get_tail(self.history_load_length,
include_latest=True):
# Ignore blank lines and consecutive duplicates
cell = cell.rstrip()
if cell and (cell != last_cell):
history.append(cell)
last_cell = cell
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())
def patch_stdout(**kwargs):
return self.pt_cli.patch_stdout_context(**kwargs)
self._pt_app = create_prompt_application(
editing_mode=editing_mode,
key_bindings_registry=kbmanager.registry,
history=history,
completer=IPythonPTCompleter(shell=self,
patch_stdout=patch_stdout),
enable_history_search=(
os.environ['enable_history_search'].capitalize()
if 'enable_history_search' in os.environ
else True
),
style=self.style,
mouse_support=self.mouse_support,
**self._layout_options()
)
self._eventloop = create_eventloop(self.inputhook)
self.pt_cli = CommandLineInterface(
self._pt_app, eventloop=self._eventloop,
output=create_output(true_color=self.true_color))
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: '#007700',
Token.Operator: 'noinherit',
Token.String: '#BB6622',
Token.Name.Function: '#2080D0',
Token.Name.Class: 'bold #2080D0',
Token.Name.Namespace: 'bold #2080D0',
Token.Prompt: '#009900',
Token.PromptNum: '#00ff00 bold',
Token.OutPrompt: '#990000',
Token.OutPromptNum: '#ff0000 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: '#009900',
Token.PromptNum: '#00ff00 bold',
Token.OutPrompt: '#990000',
Token.OutPromptNum: '#ff0000 bold',
}
style_overrides.update(self.highlighting_style_overrides)
style = PygmentsStyle.from_defaults(pygments_style_cls=style_cls,
style_dict=style_overrides)
return style
def _layout_options(self):
"""
Return the current layout option for the current Terminal InteractiveShell
"""
return {
'lexer':IPythonPTLexer(),
'reserve_space_for_menu':self.space_for_menu,
'get_prompt_tokens':self.prompts.in_prompt_tokens,
'get_continuation_tokens':self.prompts.continuation_prompt_tokens,
'multiline':True,
'display_completions_in_columns': (self.display_completions == 'multicolumn'),
# Highlight matching brackets, but only when this setting is
# enabled, and only when the DEFAULT_BUFFER has the focus.
'extra_input_processors': [ConditionalProcessor(
processor=HighlightMatchingBracketProcessor(chars='[](){}'),
filter=HasFocus(DEFAULT_BUFFER) & ~IsDone() &
Condition(lambda cli: self.highlight_matching_brackets))],
}
def _update_layout(self):
"""
Ask for a re computation of the application layout, if for example ,
some configuration options have changed.
"""
if self._pt_app:
self._pt_app.layout = create_prompt_layout(**self._layout_options())
def prompt_for_code(self):
with self.pt_cli.patch_stdout_context(raw=True):
document = self.pt_cli.run(
pre_run=self.pre_prompt, reset_current_buffer=True)
return document.text
def enable_win_unicode_console(self):
if sys.version_info >= (3, 6):
# Since PEP 528, Python uses the unicode APIs for the Windows
# console by default, so WUC shouldn't be needed.
return
import win_unicode_console
win_unicode_console.enable()
def init_io(self):
if sys.platform not in {'win32', 'cli'}:
return
self.enable_win_unicode_console()
import colorama
colorama.init()
# For some reason we make these wrappers around stdout/stderr.
# For now, we need to reset them so all output gets coloured.
# https://github.com/ipython/ipython/issues/8669
# io.std* are deprecated, but don't show our own deprecation warnings
# during initialization of the deprecated API.
with warnings.catch_warnings():
warnings.simplefilter('ignore', DeprecationWarning)
io.stdout = io.IOStream(sys.stdout)
io.stderr = io.IOStream(sys.stderr)
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.init_prompt_toolkit_cli()
self.init_term_title()
self.keep_running = True
self.debugger_history = InMemoryHistory()
def ask_exit(self):
self.keep_running = False
rl_next_input = None
def pre_prompt(self):
if self.rl_next_input:
# We can't set the buffer here, because it will be reset just after
# this. Adding a callable to pre_run_callables does what we need
# after the buffer is reset.
s = self.rl_next_input
def set_doc():
self.pt_cli.application.buffer.document = Document(s)
if hasattr(self.pt_cli, 'pre_run_callables'):
self.pt_cli.pre_run_callables.append(set_doc)
else:
# Older version of prompt_toolkit; it's OK to set the document
# directly here.
set_doc()
self.rl_next_input = None
def interact(self, display_banner=DISPLAY_BANNER_DEPRECATED):
if display_banner is not DISPLAY_BANNER_DEPRECATED:
warn('interact `display_banner` argument is deprecated since IPython 5.0. Call `show_banner()` if needed.', DeprecationWarning, stacklevel=2)
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, display_banner=DISPLAY_BANNER_DEPRECATED):
# An extra layer of protection in case someone mashing Ctrl-C breaks
# out of our internal code.
if display_banner is not DISPLAY_BANNER_DEPRECATED:
warn('mainloop `display_banner` argument is deprecated since IPython 5.0. Call `show_banner()` if needed.', DeprecationWarning, stacklevel=2)
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()
_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:
self.active_eventloop, self._inputhook =\
get_inputhook_name_and_func(gui)
else:
self.active_eventloop = self._inputhook = None
# 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_cli:
self.pt_cli.print_tokens(tokens)
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()