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# encoding: utf-8
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"""
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A mixin for :class:`~IPython.core.application.Application` classes that
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launch InteractiveShell instances, load extensions, etc.
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Authors
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-------
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* Min Ragan-Kelley
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"""
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#-----------------------------------------------------------------------------
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# Copyright (C) 2008-2011 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 absolute_import
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import os
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import sys
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from IPython.config.application import boolean_flag
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from IPython.config.configurable import Configurable
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from IPython.config.loader import Config
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from IPython.utils import py3compat
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from IPython.utils.path import filefind
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from IPython.utils.traitlets import Unicode, Instance, List, Bool
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#-----------------------------------------------------------------------------
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# Aliases and Flags
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#-----------------------------------------------------------------------------
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shell_flags = {}
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addflag = lambda *args: shell_flags.update(boolean_flag(*args))
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addflag('autoindent', 'InteractiveShell.autoindent',
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'Turn on autoindenting.', 'Turn off autoindenting.'
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)
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addflag('automagic', 'InteractiveShell.automagic',
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"""Turn on the auto calling of magic commands. Type %%magic at the
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IPython prompt for more information.""",
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'Turn off the auto calling of magic commands.'
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)
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addflag('pdb', 'InteractiveShell.pdb',
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"Enable auto calling the pdb debugger after every exception.",
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"Disable auto calling the pdb debugger after every exception."
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)
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# pydb flag doesn't do any config, as core.debugger switches on import,
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# which is before parsing. This just allows the flag to be passed.
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shell_flags.update(dict(
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pydb = ({},
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""""Use the third party 'pydb' package as debugger, instead of pdb.
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Requires that pydb is installed."""
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)
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))
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addflag('pprint', 'PlainTextFormatter.pprint',
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"Enable auto pretty printing of results.",
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"Disable auto auto pretty printing of results."
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)
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addflag('color-info', 'InteractiveShell.color_info',
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"""IPython can display information about objects via a set of func-
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tions, and optionally can use colors for this, syntax highlighting
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source code and various other elements. However, because this
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information is passed through a pager (like 'less') and many pagers get
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confused with color codes, this option is off by default. You can test
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it and turn it on permanently in your ipython_config.py file if it
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works for you. Test it and turn it on permanently if it works with
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your system. The magic function %%color_info allows you to toggle this
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interactively for testing.""",
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"Disable using colors for info related things."
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)
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addflag('deep-reload', 'InteractiveShell.deep_reload',
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"""Enable deep (recursive) reloading by default. IPython can use the
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deep_reload module which reloads changes in modules recursively (it
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replaces the reload() function, so you don't need to change anything to
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use it). deep_reload() forces a full reload of modules whose code may
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have changed, which the default reload() function does not. When
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deep_reload is off, IPython will use the normal reload(), but
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deep_reload will still be available as dreload(). This feature is off
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by default [which means that you have both normal reload() and
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dreload()].""",
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"Disable deep (recursive) reloading by default."
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)
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nosep_config = Config()
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nosep_config.InteractiveShell.separate_in = ''
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nosep_config.InteractiveShell.separate_out = ''
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nosep_config.InteractiveShell.separate_out2 = ''
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shell_flags['nosep']=(nosep_config, "Eliminate all spacing between prompts.")
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# it's possible we don't want short aliases for *all* of these:
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shell_aliases = dict(
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autocall='InteractiveShell.autocall',
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colors='InteractiveShell.colors',
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logfile='InteractiveShell.logfile',
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logappend='InteractiveShell.logappend',
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c='InteractiveShellApp.code_to_run',
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ext='InteractiveShellApp.extra_extension',
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)
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shell_aliases['cache-size'] = 'InteractiveShell.cache_size'
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#-----------------------------------------------------------------------------
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# Main classes and functions
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#-----------------------------------------------------------------------------
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class InteractiveShellApp(Configurable):
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"""A Mixin for applications that start InteractiveShell instances.
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Provides configurables for loading extensions and executing files
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as part of configuring a Shell environment.
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Provides init_extensions() and init_code() methods, to be called
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after init_shell(), which must be implemented by subclasses.
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"""
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extensions = List(Unicode, config=True,
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help="A list of dotted module names of IPython extensions to load."
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)
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extra_extension = Unicode('', config=True,
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help="dotted module name of an IPython extension to load."
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)
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def _extra_extension_changed(self, name, old, new):
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if new:
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# add to self.extensions
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self.extensions.append(new)
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exec_files = List(Unicode, config=True,
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help="""List of files to run at IPython startup."""
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)
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file_to_run = Unicode('', config=True,
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help="""A file to be run""")
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exec_lines = List(Unicode, config=True,
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help="""lines of code to run at IPython startup."""
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)
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code_to_run = Unicode('', config=True,
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help="Execute the given command string."
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)
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pylab_import_all = Bool(True, config=True,
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help="""If true, an 'import *' is done from numpy and pylab,
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when using pylab"""
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)
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shell = Instance('IPython.core.interactiveshell.InteractiveShellABC')
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def init_shell(self):
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raise NotImplementedError("Override in subclasses")
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def init_extensions(self):
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"""Load all IPython extensions in IPythonApp.extensions.
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This uses the :meth:`ExtensionManager.load_extensions` to load all
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the extensions listed in ``self.extensions``.
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"""
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if not self.extensions:
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return
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try:
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self.log.debug("Loading IPython extensions...")
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extensions = self.extensions
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for ext in extensions:
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try:
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self.log.info("Loading IPython extension: %s" % ext)
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self.shell.extension_manager.load_extension(ext)
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except:
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self.log.warn("Error in loading extension: %s" % ext)
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self.shell.showtraceback()
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except:
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self.log.warn("Unknown error in loading extensions:")
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self.shell.showtraceback()
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def init_code(self):
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"""run the pre-flight code, specified via exec_lines"""
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self._run_exec_lines()
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self._run_exec_files()
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self._run_cmd_line_code()
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def _run_exec_lines(self):
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"""Run lines of code in IPythonApp.exec_lines in the user's namespace."""
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if not self.exec_lines:
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return
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try:
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self.log.debug("Running code from IPythonApp.exec_lines...")
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for line in self.exec_lines:
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try:
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self.log.info("Running code in user namespace: %s" %
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line)
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self.shell.run_cell(line, store_history=False)
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except:
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self.log.warn("Error in executing line in user "
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"namespace: %s" % line)
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self.shell.showtraceback()
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except:
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self.log.warn("Unknown error in handling IPythonApp.exec_lines:")
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self.shell.showtraceback()
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def _exec_file(self, fname):
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try:
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full_filename = filefind(fname, [u'.', self.ipython_dir])
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except IOError as e:
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self.log.warn("File not found: %r"%fname)
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return
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# Make sure that the running script gets a proper sys.argv as if it
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# were run from a system shell.
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save_argv = sys.argv
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sys.argv = [full_filename] + self.extra_args[1:]
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# protect sys.argv from potential unicode strings on Python 2:
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if not py3compat.PY3:
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sys.argv = [ py3compat.cast_bytes(a) for a in sys.argv ]
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try:
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if os.path.isfile(full_filename):
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if full_filename.endswith('.ipy'):
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self.log.info("Running file in user namespace: %s" %
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full_filename)
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self.shell.safe_execfile_ipy(full_filename)
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else:
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# default to python, even without extension
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self.log.info("Running file in user namespace: %s" %
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full_filename)
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# Ensure that __file__ is always defined to match Python behavior
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self.shell.user_ns['__file__'] = fname
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try:
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self.shell.safe_execfile(full_filename, self.shell.user_ns)
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finally:
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del self.shell.user_ns['__file__']
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finally:
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sys.argv = save_argv
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def _run_exec_files(self):
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"""Run files from IPythonApp.exec_files"""
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if not self.exec_files:
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return
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self.log.debug("Running files in IPythonApp.exec_files...")
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try:
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for fname in self.exec_files:
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self._exec_file(fname)
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except:
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self.log.warn("Unknown error in handling IPythonApp.exec_files:")
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self.shell.showtraceback()
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def _run_cmd_line_code(self):
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"""Run code or file specified at the command-line"""
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if self.code_to_run:
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line = self.code_to_run
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try:
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self.log.info("Running code given at command line (c=): %s" %
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line)
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self.shell.run_cell(line, store_history=False)
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except:
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self.log.warn("Error in executing line in user namespace: %s" %
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line)
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self.shell.showtraceback()
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# Like Python itself, ignore the second if the first of these is present
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elif self.file_to_run:
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fname = self.file_to_run
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try:
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self._exec_file(fname)
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except:
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self.log.warn("Error in executing file in user namespace: %s" %
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fname)
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self.shell.showtraceback()
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