|
|
# encoding: utf-8
|
|
|
"""A class for managing IPython extensions.
|
|
|
|
|
|
Authors:
|
|
|
|
|
|
* Brian Granger
|
|
|
"""
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# Copyright (C) 2010-2011 The IPython Development Team
|
|
|
#
|
|
|
# Distributed under the terms of the BSD License. The full license is in
|
|
|
# the file COPYING, distributed as part of this software.
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# Imports
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
import os
|
|
|
from shutil import copyfile
|
|
|
import sys
|
|
|
from urllib import urlretrieve
|
|
|
from urlparse import urlparse
|
|
|
|
|
|
from IPython.core.error import UsageError
|
|
|
from IPython.config.configurable import Configurable
|
|
|
from IPython.utils.traitlets import Instance
|
|
|
from IPython.utils.py3compat import PY3
|
|
|
if PY3:
|
|
|
from imp import reload
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# Main class
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
class ExtensionManager(Configurable):
|
|
|
"""A class to manage IPython extensions.
|
|
|
|
|
|
An IPython extension is an importable Python module that has
|
|
|
a function with the signature::
|
|
|
|
|
|
def load_ipython_extension(ipython):
|
|
|
# Do things with ipython
|
|
|
|
|
|
This function is called after your extension is imported and the
|
|
|
currently active :class:`InteractiveShell` instance is passed as
|
|
|
the only argument. You can do anything you want with IPython at
|
|
|
that point, including defining new magic and aliases, adding new
|
|
|
components, etc.
|
|
|
|
|
|
You can also optionaly define an :func:`unload_ipython_extension(ipython)`
|
|
|
function, which will be called if the user unloads or reloads the extension.
|
|
|
The extension manager will only call :func:`load_ipython_extension` again
|
|
|
if the extension is reloaded.
|
|
|
|
|
|
You can put your extension modules anywhere you want, as long as
|
|
|
they can be imported by Python's standard import mechanism. However,
|
|
|
to make it easy to write extensions, you can also put your extensions
|
|
|
in ``os.path.join(self.ipython_dir, 'extensions')``. This directory
|
|
|
is added to ``sys.path`` automatically.
|
|
|
"""
|
|
|
|
|
|
shell = Instance('IPython.core.interactiveshell.InteractiveShellABC')
|
|
|
|
|
|
def __init__(self, shell=None, config=None):
|
|
|
super(ExtensionManager, self).__init__(shell=shell, config=config)
|
|
|
self.shell.on_trait_change(
|
|
|
self._on_ipython_dir_changed, 'ipython_dir'
|
|
|
)
|
|
|
self.loaded = set()
|
|
|
|
|
|
def __del__(self):
|
|
|
self.shell.on_trait_change(
|
|
|
self._on_ipython_dir_changed, 'ipython_dir', remove=True
|
|
|
)
|
|
|
|
|
|
@property
|
|
|
def ipython_extension_dir(self):
|
|
|
return os.path.join(self.shell.ipython_dir, u'extensions')
|
|
|
|
|
|
def _on_ipython_dir_changed(self):
|
|
|
if not os.path.isdir(self.ipython_extension_dir):
|
|
|
os.makedirs(self.ipython_extension_dir, mode = 0o777)
|
|
|
|
|
|
def load_extension(self, module_str):
|
|
|
"""Load an IPython extension by its module name.
|
|
|
|
|
|
Returns the string "already loaded" if the extension is already loaded,
|
|
|
"no load function" if the module doesn't have a load_ipython_extension
|
|
|
function, or None if it succeeded.
|
|
|
"""
|
|
|
if module_str in self.loaded:
|
|
|
return "already loaded"
|
|
|
|
|
|
from IPython.utils.syspathcontext import prepended_to_syspath
|
|
|
|
|
|
if module_str not in sys.modules:
|
|
|
with prepended_to_syspath(self.ipython_extension_dir):
|
|
|
__import__(module_str)
|
|
|
mod = sys.modules[module_str]
|
|
|
if self._call_load_ipython_extension(mod):
|
|
|
self.loaded.add(module_str)
|
|
|
else:
|
|
|
return "no load function"
|
|
|
|
|
|
def unload_extension(self, module_str):
|
|
|
"""Unload an IPython extension by its module name.
|
|
|
|
|
|
This function looks up the extension's name in ``sys.modules`` and
|
|
|
simply calls ``mod.unload_ipython_extension(self)``.
|
|
|
|
|
|
Returns the string "no unload function" if the extension doesn't define
|
|
|
a function to unload itself, "not loaded" if the extension isn't loaded,
|
|
|
otherwise None.
|
|
|
"""
|
|
|
if module_str not in self.loaded:
|
|
|
return "not loaded"
|
|
|
|
|
|
if module_str in sys.modules:
|
|
|
mod = sys.modules[module_str]
|
|
|
if self._call_unload_ipython_extension(mod):
|
|
|
self.loaded.discard(module_str)
|
|
|
else:
|
|
|
return "no unload function"
|
|
|
|
|
|
def reload_extension(self, module_str):
|
|
|
"""Reload an IPython extension by calling reload.
|
|
|
|
|
|
If the module has not been loaded before,
|
|
|
:meth:`InteractiveShell.load_extension` is called. Otherwise
|
|
|
:func:`reload` is called and then the :func:`load_ipython_extension`
|
|
|
function of the module, if it exists is called.
|
|
|
"""
|
|
|
from IPython.utils.syspathcontext import prepended_to_syspath
|
|
|
|
|
|
if (module_str in self.loaded) and (module_str in sys.modules):
|
|
|
self.unload_extension(module_str)
|
|
|
mod = sys.modules[module_str]
|
|
|
with prepended_to_syspath(self.ipython_extension_dir):
|
|
|
reload(mod)
|
|
|
if self._call_load_ipython_extension(mod):
|
|
|
self.loaded.add(module_str)
|
|
|
else:
|
|
|
self.load_extension(module_str)
|
|
|
|
|
|
def _call_load_ipython_extension(self, mod):
|
|
|
if hasattr(mod, 'load_ipython_extension'):
|
|
|
mod.load_ipython_extension(self.shell)
|
|
|
return True
|
|
|
|
|
|
def _call_unload_ipython_extension(self, mod):
|
|
|
if hasattr(mod, 'unload_ipython_extension'):
|
|
|
mod.unload_ipython_extension(self.shell)
|
|
|
return True
|
|
|
|
|
|
def install_extension(self, url, filename=None):
|
|
|
"""Download and install an IPython extension.
|
|
|
|
|
|
If filename is given, the file will be so named (inside the extension
|
|
|
directory). Otherwise, the name from the URL will be used. The file must
|
|
|
have a .py or .zip extension; otherwise, a ValueError will be raised.
|
|
|
|
|
|
Returns the full path to the installed file.
|
|
|
"""
|
|
|
# Ensure the extension directory exists
|
|
|
if not os.path.isdir(self.ipython_extension_dir):
|
|
|
os.makedirs(self.ipython_extension_dir, mode = 0o777)
|
|
|
|
|
|
if os.path.isfile(url):
|
|
|
src_filename = os.path.basename(url)
|
|
|
copy = copyfile
|
|
|
else:
|
|
|
src_filename = urlparse(url).path.split('/')[-1]
|
|
|
copy = urlretrieve
|
|
|
|
|
|
if filename is None:
|
|
|
filename = src_filename
|
|
|
if os.path.splitext(filename)[1] not in ('.py', '.zip'):
|
|
|
raise ValueError("The file must have a .py or .zip extension", filename)
|
|
|
|
|
|
filename = os.path.join(self.ipython_extension_dir, filename)
|
|
|
copy(url, filename)
|
|
|
return filename
|
|
|
|
