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#!/usr/bin/env python
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# encoding: utf-8
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"""
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An embedded IPython shell.
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Authors:
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* Brian Granger
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* Fernando Perez
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Notes
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-----
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"""
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#-----------------------------------------------------------------------------
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# Copyright (C) 2008-2009 The IPython Development Team
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#
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# Distributed under the terms of the BSD License. The full license is in
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# the file COPYING, distributed as part of this software.
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#-----------------------------------------------------------------------------
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#-----------------------------------------------------------------------------
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# Imports
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#-----------------------------------------------------------------------------
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from __future__ import with_statement
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import __main__
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import sys
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from contextlib import nested
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from IPython.core import ultratb
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from IPython.frontend.terminal.interactiveshell import TerminalInteractiveShell
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from IPython.frontend.terminal.ipapp import load_default_config
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from IPython.utils.traitlets import Bool, Str, CBool
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from IPython.utils.io import ask_yes_no
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#-----------------------------------------------------------------------------
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# Classes and functions
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#-----------------------------------------------------------------------------
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# This is an additional magic that is exposed in embedded shells.
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def kill_embedded(self,parameter_s=''):
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"""%kill_embedded : deactivate for good the current embedded IPython.
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This function (after asking for confirmation) sets an internal flag so that
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an embedded IPython will never activate again. This is useful to
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permanently disable a shell that is being called inside a loop: once you've
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figured out what you needed from it, you may then kill it and the program
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will then continue to run without the interactive shell interfering again.
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"""
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kill = ask_yes_no("Are you sure you want to kill this embedded instance "
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"(y/n)? [y/N] ",'n')
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if kill:
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self.embedded_active = False
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print "This embedded IPython will not reactivate anymore once you exit."
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class InteractiveShellEmbed(TerminalInteractiveShell):
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dummy_mode = Bool(False)
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exit_msg = Str('')
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embedded = CBool(True)
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embedded_active = CBool(True)
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# Like the base class display_banner is not configurable, but here it
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# is True by default.
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display_banner = CBool(True)
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def __init__(self, config=None, ipython_dir=None, user_ns=None,
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user_global_ns=None, custom_exceptions=((),None),
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usage=None, banner1=None, banner2=None,
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display_banner=None, exit_msg=u''):
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self.save_sys_ipcompleter()
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super(InteractiveShellEmbed,self).__init__(
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config=config, ipython_dir=ipython_dir, user_ns=user_ns,
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user_global_ns=user_global_ns, custom_exceptions=custom_exceptions,
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usage=usage, banner1=banner1, banner2=banner2,
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display_banner=display_banner
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)
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self.exit_msg = exit_msg
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self.define_magic("kill_embedded", kill_embedded)
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# don't use the ipython crash handler so that user exceptions aren't
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# trapped
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sys.excepthook = ultratb.FormattedTB(color_scheme=self.colors,
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mode=self.xmode,
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call_pdb=self.pdb)
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self.restore_sys_ipcompleter()
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def init_sys_modules(self):
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pass
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def save_sys_ipcompleter(self):
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"""Save readline completer status."""
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try:
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#print 'Save completer',sys.ipcompleter # dbg
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self.sys_ipcompleter_orig = sys.ipcompleter
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except:
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pass # not nested with IPython
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def restore_sys_ipcompleter(self):
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"""Restores the readline completer which was in place.
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This allows embedded IPython within IPython not to disrupt the
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parent's completion.
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"""
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try:
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self.readline.set_completer(self.sys_ipcompleter_orig)
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sys.ipcompleter = self.sys_ipcompleter_orig
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except:
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pass
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def __call__(self, header='', local_ns=None, global_ns=None, dummy=None,
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stack_depth=1):
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"""Activate the interactive interpreter.
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__call__(self,header='',local_ns=None,global_ns,dummy=None) -> Start
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the interpreter shell with the given local and global namespaces, and
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optionally print a header string at startup.
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The shell can be globally activated/deactivated using the
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set/get_dummy_mode methods. This allows you to turn off a shell used
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for debugging globally.
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However, *each* time you call the shell you can override the current
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state of dummy_mode with the optional keyword parameter 'dummy'. For
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example, if you set dummy mode on with IPShell.set_dummy_mode(1), you
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can still have a specific call work by making it as IPShell(dummy=0).
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The optional keyword parameter dummy controls whether the call
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actually does anything.
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"""
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# If the user has turned it off, go away
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if not self.embedded_active:
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return
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# Normal exits from interactive mode set this flag, so the shell can't
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# re-enter (it checks this variable at the start of interactive mode).
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self.exit_now = False
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# Allow the dummy parameter to override the global __dummy_mode
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if dummy or (dummy != 0 and self.dummy_mode):
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return
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if self.has_readline:
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self.set_completer()
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# self.banner is auto computed
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if header:
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self.old_banner2 = self.banner2
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self.banner2 = self.banner2 + '\n' + header + '\n'
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else:
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self.old_banner2 = ''
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# Call the embedding code with a stack depth of 1 so it can skip over
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# our call and get the original caller's namespaces.
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self.mainloop(local_ns, global_ns, stack_depth=stack_depth)
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self.banner2 = self.old_banner2
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if self.exit_msg is not None:
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print self.exit_msg
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self.restore_sys_ipcompleter()
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def mainloop(self, local_ns=None, global_ns=None, stack_depth=0,
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display_banner=None):
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"""Embeds IPython into a running python program.
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Input:
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- header: An optional header message can be specified.
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- local_ns, global_ns: working namespaces. If given as None, the
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IPython-initialized one is updated with __main__.__dict__, so that
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program variables become visible but user-specific configuration
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remains possible.
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- stack_depth: specifies how many levels in the stack to go to
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looking for namespaces (when local_ns and global_ns are None). This
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allows an intermediate caller to make sure that this function gets
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the namespace from the intended level in the stack. By default (0)
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it will get its locals and globals from the immediate caller.
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Warning: it's possible to use this in a program which is being run by
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IPython itself (via %run), but some funny things will happen (a few
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globals get overwritten). In the future this will be cleaned up, as
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there is no fundamental reason why it can't work perfectly."""
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# Get locals and globals from caller
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if local_ns is None or global_ns is None:
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call_frame = sys._getframe(stack_depth).f_back
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if local_ns is None:
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local_ns = call_frame.f_locals
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if global_ns is None:
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global_ns = call_frame.f_globals
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# Update namespaces and fire up interpreter
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# The global one is easy, we can just throw it in
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self.user_global_ns = global_ns
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# but the user/local one is tricky: ipython needs it to store internal
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# data, but we also need the locals. We'll copy locals in the user
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# one, but will track what got copied so we can delete them at exit.
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# This is so that a later embedded call doesn't see locals from a
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# previous call (which most likely existed in a separate scope).
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local_varnames = local_ns.keys()
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self.user_ns.update(local_ns)
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#self.user_ns['local_ns'] = local_ns # dbg
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# Patch for global embedding to make sure that things don't overwrite
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# user globals accidentally. Thanks to Richard <rxe@renre-europe.com>
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# FIXME. Test this a bit more carefully (the if.. is new)
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if local_ns is None and global_ns is None:
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self.user_global_ns.update(__main__.__dict__)
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# make sure the tab-completer has the correct frame information, so it
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# actually completes using the frame's locals/globals
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self.set_completer_frame()
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with nested(self.builtin_trap, self.display_trap):
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self.interact(display_banner=display_banner)
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# now, purge out the user namespace from anything we might have added
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# from the caller's local namespace
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delvar = self.user_ns.pop
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for var in local_varnames:
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delvar(var,None)
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_embedded_shell = None
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def embed(**kwargs):
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"""Call this to embed IPython at the current point in your program.
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The first invocation of this will create an :class:`InteractiveShellEmbed`
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instance and then call it. Consecutive calls just call the already
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created instance.
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Here is a simple example::
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from IPython import embed
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a = 10
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b = 20
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embed('First time')
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c = 30
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d = 40
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embed
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Full customization can be done by passing a :class:`Struct` in as the
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config argument.
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"""
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config = kwargs.get('config')
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header = kwargs.pop('header', u'')
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if config is None:
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config = load_default_config()
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config.InteractiveShellEmbed = config.TerminalInteractiveShell
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global _embedded_shell
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if _embedded_shell is None:
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_embedded_shell = InteractiveShellEmbed(**kwargs)
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_embedded_shell(header=header, stack_depth=2)
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