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"""A ZMQ-based subclass of InteractiveShell.
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This code is meant to ease the refactoring of the base InteractiveShell into
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something with a cleaner architecture for 2-process use, without actually
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breaking InteractiveShell itself. So we're doing something a bit ugly, where
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we subclass and override what we want to fix. Once this is working well, we
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can go back to the base class and refactor the code for a cleaner inheritance
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implementation that doesn't rely on so much monkeypatching.
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But this lets us maintain a fully working IPython as we develop the new
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machinery. This should thus be thought of as scaffolding.
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"""
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#-----------------------------------------------------------------------------
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# Imports
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#-----------------------------------------------------------------------------
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from __future__ import print_function
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# Stdlib
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import os
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import sys
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import time
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# System library imports
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from zmq.eventloop import ioloop
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# Our own
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from IPython.core.interactiveshell import (
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InteractiveShell, InteractiveShellABC
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)
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from IPython.core import page
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from IPython.core.autocall import ZMQExitAutocall
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from IPython.core.displaypub import DisplayPublisher
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from IPython.core.error import UsageError
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from IPython.core.magics import MacroToEdit, CodeMagics
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from IPython.core.magic import magics_class, line_magic, Magics
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from IPython.core.payloadpage import install_payload_page
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from IPython.inprocess.socket import SocketABC
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from IPython.kernel import (
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get_connection_file, get_connection_info, connect_qtconsole
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)
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from IPython.testing.skipdoctest import skip_doctest
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from IPython.utils import io, openpy
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from IPython.utils.jsonutil import json_clean, encode_images
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from IPython.utils.process import arg_split
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from IPython.utils import py3compat
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from IPython.utils.traitlets import Instance, Type, Dict, CBool, CBytes
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from IPython.utils.warn import warn, error
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from IPython.zmq.displayhook import ZMQShellDisplayHook
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from IPython.zmq.datapub import ZMQDataPublisher
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from IPython.zmq.session import extract_header
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from session import Session
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#-----------------------------------------------------------------------------
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# Functions and classes
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#-----------------------------------------------------------------------------
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class ZMQDisplayPublisher(DisplayPublisher):
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"""A display publisher that publishes data using a ZeroMQ PUB socket."""
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session = Instance(Session)
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pub_socket = Instance(SocketABC)
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parent_header = Dict({})
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topic = CBytes(b'displaypub')
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def set_parent(self, parent):
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"""Set the parent for outbound messages."""
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self.parent_header = extract_header(parent)
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def _flush_streams(self):
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"""flush IO Streams prior to display"""
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sys.stdout.flush()
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sys.stderr.flush()
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def publish(self, source, data, metadata=None):
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self._flush_streams()
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if metadata is None:
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metadata = {}
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self._validate_data(source, data, metadata)
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content = {}
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content['source'] = source
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content['data'] = encode_images(data)
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content['metadata'] = metadata
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self.session.send(
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self.pub_socket, u'display_data', json_clean(content),
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parent=self.parent_header, ident=self.topic,
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)
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def clear_output(self, stdout=True, stderr=True, other=True):
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content = dict(stdout=stdout, stderr=stderr, other=other)
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if stdout:
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print('\r', file=sys.stdout, end='')
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if stderr:
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print('\r', file=sys.stderr, end='')
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self._flush_streams()
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self.session.send(
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self.pub_socket, u'clear_output', content,
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parent=self.parent_header, ident=self.topic,
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)
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@magics_class
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class KernelMagics(Magics):
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#------------------------------------------------------------------------
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# Magic overrides
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#------------------------------------------------------------------------
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# Once the base class stops inheriting from magic, this code needs to be
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# moved into a separate machinery as well. For now, at least isolate here
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# the magics which this class needs to implement differently from the base
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# class, or that are unique to it.
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@line_magic
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def doctest_mode(self, parameter_s=''):
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"""Toggle doctest mode on and off.
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This mode is intended to make IPython behave as much as possible like a
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plain Python shell, from the perspective of how its prompts, exceptions
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and output look. This makes it easy to copy and paste parts of a
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session into doctests. It does so by:
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- Changing the prompts to the classic ``>>>`` ones.
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- Changing the exception reporting mode to 'Plain'.
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- Disabling pretty-printing of output.
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Note that IPython also supports the pasting of code snippets that have
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leading '>>>' and '...' prompts in them. This means that you can paste
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doctests from files or docstrings (even if they have leading
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whitespace), and the code will execute correctly. You can then use
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'%history -t' to see the translated history; this will give you the
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input after removal of all the leading prompts and whitespace, which
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can be pasted back into an editor.
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With these features, you can switch into this mode easily whenever you
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need to do testing and changes to doctests, without having to leave
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your existing IPython session.
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"""
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from IPython.utils.ipstruct import Struct
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# Shorthands
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shell = self.shell
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disp_formatter = self.shell.display_formatter
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ptformatter = disp_formatter.formatters['text/plain']
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# dstore is a data store kept in the instance metadata bag to track any
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# changes we make, so we can undo them later.
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dstore = shell.meta.setdefault('doctest_mode', Struct())
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save_dstore = dstore.setdefault
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# save a few values we'll need to recover later
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mode = save_dstore('mode', False)
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save_dstore('rc_pprint', ptformatter.pprint)
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save_dstore('rc_plain_text_only',disp_formatter.plain_text_only)
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save_dstore('xmode', shell.InteractiveTB.mode)
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if mode == False:
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# turn on
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ptformatter.pprint = False
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disp_formatter.plain_text_only = True
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shell.magic('xmode Plain')
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else:
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# turn off
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ptformatter.pprint = dstore.rc_pprint
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disp_formatter.plain_text_only = dstore.rc_plain_text_only
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shell.magic("xmode " + dstore.xmode)
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# Store new mode and inform on console
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dstore.mode = bool(1-int(mode))
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mode_label = ['OFF','ON'][dstore.mode]
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print('Doctest mode is:', mode_label)
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# Send the payload back so that clients can modify their prompt display
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payload = dict(
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source='IPython.zmq.zmqshell.ZMQInteractiveShell.doctest_mode',
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mode=dstore.mode)
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shell.payload_manager.write_payload(payload)
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_find_edit_target = CodeMagics._find_edit_target
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@skip_doctest
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@line_magic
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def edit(self, parameter_s='', last_call=['','']):
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"""Bring up an editor and execute the resulting code.
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Usage:
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%edit [options] [args]
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%edit runs an external text editor. You will need to set the command for
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this editor via the ``TerminalInteractiveShell.editor`` option in your
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configuration file before it will work.
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This command allows you to conveniently edit multi-line code right in
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your IPython session.
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If called without arguments, %edit opens up an empty editor with a
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temporary file and will execute the contents of this file when you
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close it (don't forget to save it!).
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Options:
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-n <number>: open the editor at a specified line number. By default,
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the IPython editor hook uses the unix syntax 'editor +N filename', but
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you can configure this by providing your own modified hook if your
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favorite editor supports line-number specifications with a different
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syntax.
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-p: this will call the editor with the same data as the previous time
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it was used, regardless of how long ago (in your current session) it
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was.
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-r: use 'raw' input. This option only applies to input taken from the
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user's history. By default, the 'processed' history is used, so that
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magics are loaded in their transformed version to valid Python. If
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this option is given, the raw input as typed as the command line is
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used instead. When you exit the editor, it will be executed by
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IPython's own processor.
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-x: do not execute the edited code immediately upon exit. This is
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mainly useful if you are editing programs which need to be called with
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command line arguments, which you can then do using %run.
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Arguments:
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If arguments are given, the following possibilites exist:
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- The arguments are numbers or pairs of colon-separated numbers (like
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1 4:8 9). These are interpreted as lines of previous input to be
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loaded into the editor. The syntax is the same of the %macro command.
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- If the argument doesn't start with a number, it is evaluated as a
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variable and its contents loaded into the editor. You can thus edit
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any string which contains python code (including the result of
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previous edits).
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- If the argument is the name of an object (other than a string),
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IPython will try to locate the file where it was defined and open the
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editor at the point where it is defined. You can use `%edit function`
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to load an editor exactly at the point where 'function' is defined,
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edit it and have the file be executed automatically.
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If the object is a macro (see %macro for details), this opens up your
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specified editor with a temporary file containing the macro's data.
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Upon exit, the macro is reloaded with the contents of the file.
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Note: opening at an exact line is only supported under Unix, and some
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editors (like kedit and gedit up to Gnome 2.8) do not understand the
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'+NUMBER' parameter necessary for this feature. Good editors like
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(X)Emacs, vi, jed, pico and joe all do.
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- If the argument is not found as a variable, IPython will look for a
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file with that name (adding .py if necessary) and load it into the
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editor. It will execute its contents with execfile() when you exit,
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loading any code in the file into your interactive namespace.
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After executing your code, %edit will return as output the code you
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typed in the editor (except when it was an existing file). This way
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you can reload the code in further invocations of %edit as a variable,
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via _<NUMBER> or Out[<NUMBER>], where <NUMBER> is the prompt number of
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the output.
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Note that %edit is also available through the alias %ed.
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This is an example of creating a simple function inside the editor and
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then modifying it. First, start up the editor:
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In [1]: ed
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Editing... done. Executing edited code...
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Out[1]: 'def foo():n print "foo() was defined in an editing session"n'
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We can then call the function foo():
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In [2]: foo()
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foo() was defined in an editing session
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Now we edit foo. IPython automatically loads the editor with the
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(temporary) file where foo() was previously defined:
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In [3]: ed foo
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Editing... done. Executing edited code...
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And if we call foo() again we get the modified version:
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In [4]: foo()
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foo() has now been changed!
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Here is an example of how to edit a code snippet successive
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times. First we call the editor:
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In [5]: ed
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Editing... done. Executing edited code...
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hello
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Out[5]: "print 'hello'n"
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Now we call it again with the previous output (stored in _):
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In [6]: ed _
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Editing... done. Executing edited code...
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hello world
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Out[6]: "print 'hello world'n"
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Now we call it with the output #8 (stored in _8, also as Out[8]):
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In [7]: ed _8
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Editing... done. Executing edited code...
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hello again
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Out[7]: "print 'hello again'n"
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"""
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opts,args = self.parse_options(parameter_s,'prn:')
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try:
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filename, lineno, _ = CodeMagics._find_edit_target(self.shell, args, opts, last_call)
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except MacroToEdit as e:
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# TODO: Implement macro editing over 2 processes.
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print("Macro editing not yet implemented in 2-process model.")
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return
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# Make sure we send to the client an absolute path, in case the working
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# directory of client and kernel don't match
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filename = os.path.abspath(filename)
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payload = {
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'source' : 'IPython.zmq.zmqshell.ZMQInteractiveShell.edit_magic',
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'filename' : filename,
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'line_number' : lineno
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}
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self.shell.payload_manager.write_payload(payload)
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# A few magics that are adapted to the specifics of using pexpect and a
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# remote terminal
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@line_magic
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def clear(self, arg_s):
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"""Clear the terminal."""
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if os.name == 'posix':
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self.shell.system("clear")
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|
else:
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self.shell.system("cls")
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|
|
|
if os.name == 'nt':
|
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|
# This is the usual name in windows
|
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|
cls = line_magic('cls')(clear)
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|
|
# Terminal pagers won't work over pexpect, but we do have our own pager
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|
|
|
@line_magic
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def less(self, arg_s):
|
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|
"""Show a file through the pager.
|
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|
|
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|
Files ending in .py are syntax-highlighted."""
|
|
|
if not arg_s:
|
|
|
raise UsageError('Missing filename.')
|
|
|
|
|
|
cont = open(arg_s).read()
|
|
|
if arg_s.endswith('.py'):
|
|
|
cont = self.shell.pycolorize(openpy.read_py_file(arg_s, skip_encoding_cookie=False))
|
|
|
else:
|
|
|
cont = open(arg_s).read()
|
|
|
page.page(cont)
|
|
|
|
|
|
more = line_magic('more')(less)
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|
|
|
|
|
# Man calls a pager, so we also need to redefine it
|
|
|
if os.name == 'posix':
|
|
|
@line_magic
|
|
|
def man(self, arg_s):
|
|
|
"""Find the man page for the given command and display in pager."""
|
|
|
page.page(self.shell.getoutput('man %s | col -b' % arg_s,
|
|
|
split=False))
|
|
|
|
|
|
@line_magic
|
|
|
def connect_info(self, arg_s):
|
|
|
"""Print information for connecting other clients to this kernel
|
|
|
|
|
|
It will print the contents of this session's connection file, as well as
|
|
|
shortcuts for local clients.
|
|
|
|
|
|
In the simplest case, when called from the most recently launched kernel,
|
|
|
secondary clients can be connected, simply with:
|
|
|
|
|
|
$> ipython <app> --existing
|
|
|
|
|
|
"""
|
|
|
|
|
|
from IPython.core.application import BaseIPythonApplication as BaseIPApp
|
|
|
|
|
|
if BaseIPApp.initialized():
|
|
|
app = BaseIPApp.instance()
|
|
|
security_dir = app.profile_dir.security_dir
|
|
|
profile = app.profile
|
|
|
else:
|
|
|
profile = 'default'
|
|
|
security_dir = ''
|
|
|
|
|
|
try:
|
|
|
connection_file = get_connection_file()
|
|
|
info = get_connection_info(unpack=False)
|
|
|
except Exception as e:
|
|
|
error("Could not get connection info: %r" % e)
|
|
|
return
|
|
|
|
|
|
# add profile flag for non-default profile
|
|
|
profile_flag = "--profile %s" % profile if profile != 'default' else ""
|
|
|
|
|
|
# if it's in the security dir, truncate to basename
|
|
|
if security_dir == os.path.dirname(connection_file):
|
|
|
connection_file = os.path.basename(connection_file)
|
|
|
|
|
|
|
|
|
print (info + '\n')
|
|
|
print ("Paste the above JSON into a file, and connect with:\n"
|
|
|
" $> ipython <app> --existing <file>\n"
|
|
|
"or, if you are local, you can connect with just:\n"
|
|
|
" $> ipython <app> --existing {0} {1}\n"
|
|
|
"or even just:\n"
|
|
|
" $> ipython <app> --existing {1}\n"
|
|
|
"if this is the most recent IPython session you have started.".format(
|
|
|
connection_file, profile_flag
|
|
|
)
|
|
|
)
|
|
|
|
|
|
@line_magic
|
|
|
def qtconsole(self, arg_s):
|
|
|
"""Open a qtconsole connected to this kernel.
|
|
|
|
|
|
Useful for connecting a qtconsole to running notebooks, for better
|
|
|
debugging.
|
|
|
"""
|
|
|
|
|
|
# %qtconsole should imply bind_kernel for engines:
|
|
|
try:
|
|
|
from IPython.parallel import bind_kernel
|
|
|
except ImportError:
|
|
|
# technically possible, because parallel has higher pyzmq min-version
|
|
|
pass
|
|
|
else:
|
|
|
bind_kernel()
|
|
|
|
|
|
try:
|
|
|
p = connect_qtconsole(argv=arg_split(arg_s, os.name=='posix'))
|
|
|
except Exception as e:
|
|
|
error("Could not start qtconsole: %r" % e)
|
|
|
return
|
|
|
|
|
|
def safe_unicode(e):
|
|
|
"""unicode(e) with various fallbacks. Used for exceptions, which may not be
|
|
|
safe to call unicode() on.
|
|
|
"""
|
|
|
try:
|
|
|
return unicode(e)
|
|
|
except UnicodeError:
|
|
|
pass
|
|
|
|
|
|
try:
|
|
|
return py3compat.str_to_unicode(str(e))
|
|
|
except UnicodeError:
|
|
|
pass
|
|
|
|
|
|
try:
|
|
|
return py3compat.str_to_unicode(repr(e))
|
|
|
except UnicodeError:
|
|
|
pass
|
|
|
|
|
|
return u'Unrecoverably corrupt evalue'
|
|
|
|
|
|
|
|
|
class ZMQInteractiveShell(InteractiveShell):
|
|
|
"""A subclass of InteractiveShell for ZMQ."""
|
|
|
|
|
|
displayhook_class = Type(ZMQShellDisplayHook)
|
|
|
display_pub_class = Type(ZMQDisplayPublisher)
|
|
|
data_pub_class = Type(ZMQDataPublisher)
|
|
|
|
|
|
# Override the traitlet in the parent class, because there's no point using
|
|
|
# readline for the kernel. Can be removed when the readline code is moved
|
|
|
# to the terminal frontend.
|
|
|
colors_force = CBool(True)
|
|
|
readline_use = CBool(False)
|
|
|
# autoindent has no meaning in a zmqshell, and attempting to enable it
|
|
|
# will print a warning in the absence of readline.
|
|
|
autoindent = CBool(False)
|
|
|
|
|
|
exiter = Instance(ZMQExitAutocall)
|
|
|
def _exiter_default(self):
|
|
|
return ZMQExitAutocall(self)
|
|
|
|
|
|
def _exit_now_changed(self, name, old, new):
|
|
|
"""stop eventloop when exit_now fires"""
|
|
|
if new:
|
|
|
loop = ioloop.IOLoop.instance()
|
|
|
loop.add_timeout(time.time()+0.1, loop.stop)
|
|
|
|
|
|
keepkernel_on_exit = None
|
|
|
|
|
|
# Over ZeroMQ, GUI control isn't done with PyOS_InputHook as there is no
|
|
|
# interactive input being read; we provide event loop support in ipkernel
|
|
|
from .eventloops import enable_gui
|
|
|
enable_gui = staticmethod(enable_gui)
|
|
|
|
|
|
def init_environment(self):
|
|
|
"""Configure the user's environment.
|
|
|
|
|
|
"""
|
|
|
env = os.environ
|
|
|
# These two ensure 'ls' produces nice coloring on BSD-derived systems
|
|
|
env['TERM'] = 'xterm-color'
|
|
|
env['CLICOLOR'] = '1'
|
|
|
# Since normal pagers don't work at all (over pexpect we don't have
|
|
|
# single-key control of the subprocess), try to disable paging in
|
|
|
# subprocesses as much as possible.
|
|
|
env['PAGER'] = 'cat'
|
|
|
env['GIT_PAGER'] = 'cat'
|
|
|
|
|
|
# And install the payload version of page.
|
|
|
install_payload_page()
|
|
|
|
|
|
def auto_rewrite_input(self, cmd):
|
|
|
"""Called to show the auto-rewritten input for autocall and friends.
|
|
|
|
|
|
FIXME: this payload is currently not correctly processed by the
|
|
|
frontend.
|
|
|
"""
|
|
|
new = self.prompt_manager.render('rewrite') + cmd
|
|
|
payload = dict(
|
|
|
source='IPython.zmq.zmqshell.ZMQInteractiveShell.auto_rewrite_input',
|
|
|
transformed_input=new,
|
|
|
)
|
|
|
self.payload_manager.write_payload(payload)
|
|
|
|
|
|
def ask_exit(self):
|
|
|
"""Engage the exit actions."""
|
|
|
self.exit_now = True
|
|
|
payload = dict(
|
|
|
source='IPython.zmq.zmqshell.ZMQInteractiveShell.ask_exit',
|
|
|
exit=True,
|
|
|
keepkernel=self.keepkernel_on_exit,
|
|
|
)
|
|
|
self.payload_manager.write_payload(payload)
|
|
|
|
|
|
def _showtraceback(self, etype, evalue, stb):
|
|
|
|
|
|
exc_content = {
|
|
|
u'traceback' : stb,
|
|
|
u'ename' : unicode(etype.__name__),
|
|
|
u'evalue' : safe_unicode(evalue)
|
|
|
}
|
|
|
|
|
|
dh = self.displayhook
|
|
|
# Send exception info over pub socket for other clients than the caller
|
|
|
# to pick up
|
|
|
topic = None
|
|
|
if dh.topic:
|
|
|
topic = dh.topic.replace(b'pyout', b'pyerr')
|
|
|
|
|
|
exc_msg = dh.session.send(dh.pub_socket, u'pyerr', json_clean(exc_content), dh.parent_header, ident=topic)
|
|
|
|
|
|
# FIXME - Hack: store exception info in shell object. Right now, the
|
|
|
# caller is reading this info after the fact, we need to fix this logic
|
|
|
# to remove this hack. Even uglier, we need to store the error status
|
|
|
# here, because in the main loop, the logic that sets it is being
|
|
|
# skipped because runlines swallows the exceptions.
|
|
|
exc_content[u'status'] = u'error'
|
|
|
self._reply_content = exc_content
|
|
|
# /FIXME
|
|
|
|
|
|
return exc_content
|
|
|
|
|
|
def set_next_input(self, text):
|
|
|
"""Send the specified text to the frontend to be presented at the next
|
|
|
input cell."""
|
|
|
payload = dict(
|
|
|
source='IPython.zmq.zmqshell.ZMQInteractiveShell.set_next_input',
|
|
|
text=text
|
|
|
)
|
|
|
self.payload_manager.write_payload(payload)
|
|
|
|
|
|
#-------------------------------------------------------------------------
|
|
|
# Things related to magics
|
|
|
#-------------------------------------------------------------------------
|
|
|
|
|
|
def init_magics(self):
|
|
|
super(ZMQInteractiveShell, self).init_magics()
|
|
|
self.register_magics(KernelMagics)
|
|
|
self.magics_manager.register_alias('ed', 'edit')
|
|
|
|
|
|
|
|
|
|
|
|
InteractiveShellABC.register(ZMQInteractiveShell)
|
|
|
|
