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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 inspect
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import os
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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.macro import Macro
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from IPython.core.magic import MacroToEdit
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from IPython.core.payloadpage import install_payload_page
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from IPython.utils import io
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from IPython.utils.path import get_py_filename
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from IPython.utils.traitlets import Instance, Type, Dict
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from IPython.utils.warn import warn
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from IPython.zmq.displayhook import ZMQShellDisplayHook, _encode_png
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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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# Globals and side-effects
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#-----------------------------------------------------------------------------
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# Install the payload version of page.
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install_payload_page()
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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('zmq.Socket')
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parent_header = Dict({})
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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 publish(self, source, data, metadata=None):
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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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_encode_png(data)
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content['data'] = 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', content,
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parent=self.parent_header
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)
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class ZMQInteractiveShell(InteractiveShell):
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"""A subclass of InteractiveShell for ZMQ."""
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displayhook_class = Type(ZMQShellDisplayHook)
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display_pub_class = Type(ZMQDisplayPublisher)
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exiter = Instance(ZMQExitAutocall)
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def _exiter_default(self):
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return ZMQExitAutocall(self)
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keepkernel_on_exit = None
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def init_environment(self):
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"""Configure the user's environment.
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"""
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env = os.environ
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# These two ensure 'ls' produces nice coloring on BSD-derived systems
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env['TERM'] = 'xterm-color'
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env['CLICOLOR'] = '1'
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# Since normal pagers don't work at all (over pexpect we don't have
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# single-key control of the subprocess), try to disable paging in
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# subprocesses as much as possible.
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env['PAGER'] = 'cat'
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env['GIT_PAGER'] = 'cat'
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def auto_rewrite_input(self, cmd):
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"""Called to show the auto-rewritten input for autocall and friends.
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FIXME: this payload is currently not correctly processed by the
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frontend.
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"""
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new = self.displayhook.prompt1.auto_rewrite() + cmd
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payload = dict(
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source='IPython.zmq.zmqshell.ZMQInteractiveShell.auto_rewrite_input',
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transformed_input=new,
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)
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self.payload_manager.write_payload(payload)
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def ask_exit(self):
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"""Engage the exit actions."""
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payload = dict(
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source='IPython.zmq.zmqshell.ZMQInteractiveShell.ask_exit',
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exit=True,
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keepkernel=self.keepkernel_on_exit,
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)
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self.payload_manager.write_payload(payload)
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def _showtraceback(self, etype, evalue, stb):
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exc_content = {
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u'traceback' : stb,
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u'ename' : unicode(etype.__name__),
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u'evalue' : unicode(evalue)
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}
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dh = self.displayhook
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# Send exception info over pub socket for other clients than the caller
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# to pick up
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exc_msg = dh.session.send(dh.pub_socket, u'pyerr', exc_content, dh.parent_header)
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# FIXME - Hack: store exception info in shell object. Right now, the
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# caller is reading this info after the fact, we need to fix this logic
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# to remove this hack. Even uglier, we need to store the error status
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# here, because in the main loop, the logic that sets it is being
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# skipped because runlines swallows the exceptions.
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exc_content[u'status'] = u'error'
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self._reply_content = exc_content
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# /FIXME
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return exc_content
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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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def magic_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.magic_doctest_mode',
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mode=dstore.mode)
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self.payload_manager.write_payload(payload)
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def magic_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 IPython's editor hook. The default version of this hook is
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set to call the __IPYTHON__.rc.editor command. This is read from your
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environment variable $EDITOR. If this isn't found, it will default to
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vi under Linux/Unix and to notepad under Windows. See the end of this
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|
docstring for how to change the editor hook.
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|
You can also set the value of this editor via the command line option
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|
'-editor' or in your ipythonrc file. This is useful if you wish to use
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|
|
specifically for IPython an editor different from your typical default
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(and for Windows users who typically don't set environment variables).
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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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|
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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
|
|
|
(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,
|
|
|
loading any code in the file into your interactive namespace.
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|
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|
After executing your code, %edit will return as output the code you
|
|
|
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,
|
|
|
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.
|
|
|
|
|
|
This is an example of creating a simple function inside the editor and
|
|
|
then modifying it. First, start up the editor:
|
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|
|
|
In [1]: ed
|
|
|
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...
|
|
|
|
|
|
And if we call foo() again we get the modified version:
|
|
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|
|
|
In [4]: foo()
|
|
|
foo() has now been changed!
|
|
|
|
|
|
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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|
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|
|
|
In [7]: ed _8
|
|
|
Editing... done. Executing edited code...
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|
|
hello again
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|
|
Out[7]: "print 'hello again'n"
|
|
|
|
|
|
|
|
|
Changing the default editor hook:
|
|
|
|
|
|
If you wish to write your own editor hook, you can put it in a
|
|
|
configuration file which you load at startup time. The default hook
|
|
|
is defined in the IPython.core.hooks module, and you can use that as a
|
|
|
starting example for further modifications. That file also has
|
|
|
general instructions on how to set a new hook for use once you've
|
|
|
defined it."""
|
|
|
|
|
|
opts,args = self.parse_options(parameter_s,'prn:')
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|
|
|
|
|
try:
|
|
|
filename, lineno, _ = self._find_edit_target(args, opts, last_call)
|
|
|
except MacroToEdit as e:
|
|
|
# TODO: Implement macro editing over 2 processes.
|
|
|
print("Macro editing not yet implemented in 2-process model.")
|
|
|
return
|
|
|
|
|
|
# Make sure we send to the client an absolute path, in case the working
|
|
|
# directory of client and kernel don't match
|
|
|
filename = os.path.abspath(filename)
|
|
|
|
|
|
payload = {
|
|
|
'source' : 'IPython.zmq.zmqshell.ZMQInteractiveShell.edit_magic',
|
|
|
'filename' : filename,
|
|
|
'line_number' : lineno
|
|
|
}
|
|
|
self.payload_manager.write_payload(payload)
|
|
|
|
|
|
def magic_gui(self, *args, **kwargs):
|
|
|
raise NotImplementedError(
|
|
|
'GUI support must be enabled in command line options.')
|
|
|
|
|
|
def magic_pylab(self, *args, **kwargs):
|
|
|
raise NotImplementedError(
|
|
|
'pylab support must be enabled in command line options.')
|
|
|
|
|
|
# A few magics that are adapted to the specifics of using pexpect and a
|
|
|
# remote terminal
|
|
|
|
|
|
def magic_clear(self, arg_s):
|
|
|
"""Clear the terminal."""
|
|
|
if os.name == 'posix':
|
|
|
self.shell.system("clear")
|
|
|
else:
|
|
|
self.shell.system("cls")
|
|
|
|
|
|
if os.name == 'nt':
|
|
|
# This is the usual name in windows
|
|
|
magic_cls = magic_clear
|
|
|
|
|
|
# Terminal pagers won't work over pexpect, but we do have our own pager
|
|
|
|
|
|
def magic_less(self, arg_s):
|
|
|
"""Show a file through the pager.
|
|
|
|
|
|
Files ending in .py are syntax-highlighted."""
|
|
|
cont = open(arg_s).read()
|
|
|
if arg_s.endswith('.py'):
|
|
|
cont = self.shell.pycolorize(cont)
|
|
|
page.page(cont)
|
|
|
|
|
|
magic_more = magic_less
|
|
|
|
|
|
# Man calls a pager, so we also need to redefine it
|
|
|
if os.name == 'posix':
|
|
|
def magic_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))
|
|
|
|
|
|
# FIXME: this is specific to the GUI, so we should let the gui app load
|
|
|
# magics at startup that are only for the gui. Once the gui app has proper
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# profile and configuration management, we can have it initialize a kernel
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# with a special config file that provides these.
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def magic_guiref(self, arg_s):
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"""Show a basic reference about the GUI console."""
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from IPython.core.usage import gui_reference
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page.page(gui_reference, auto_html=True)
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def set_next_input(self, text):
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"""Send the specified text to the frontend to be presented at the next
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input cell."""
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payload = dict(
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source='IPython.zmq.zmqshell.ZMQInteractiveShell.set_next_input',
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text=text
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)
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self.payload_manager.write_payload(payload)
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InteractiveShellABC.register(ZMQInteractiveShell)
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