1
# Copyright (C) 2004, 2005, 2007, 2008 Canonical Ltd
3
# This program is free software; you can redistribute it and/or modify
4
# it under the terms of the GNU General Public License as published by
5
# the Free Software Foundation; either version 2 of the License, or
6
# (at your option) any later version.
8
# This program is distributed in the hope that it will be useful,
9
# but WITHOUT ANY WARRANTY; without even the implied warranty of
10
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11
# GNU General Public License for more details.
13
# You should have received a copy of the GNU General Public License
14
# along with this program; if not, write to the Free Software
15
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18
"""bzr python plugin support.
20
When load_plugins() is invoked, any python module in any directory in
21
$BZR_PLUGIN_PATH will be imported. The module will be imported as
22
'bzrlib.plugins.$BASENAME(PLUGIN)'. In the plugin's main body, it should
23
update any bzrlib registries it wants to extend.
25
See the plugin-api developer documentation for information about writing
28
BZR_PLUGIN_PATH is also honoured for any plugins imported via
29
'import bzrlib.plugins.PLUGINNAME', as long as set_plugins_path has been
36
from bzrlib import osutils
38
from bzrlib.lazy_import import lazy_import
40
lazy_import(globals(), """
46
_format_version_tuple,
52
from bzrlib import plugins as _mod_plugins
55
from bzrlib.symbol_versioning import (
61
DEFAULT_PLUGIN_PATH = None
64
@deprecated_function(deprecated_in((2, 0, 0)))
65
def get_default_plugin_path():
66
"""Get the DEFAULT_PLUGIN_PATH"""
67
global DEFAULT_PLUGIN_PATH
68
if DEFAULT_PLUGIN_PATH is None:
69
DEFAULT_PLUGIN_PATH = osutils.pathjoin(config.config_dir(), 'plugins')
70
return DEFAULT_PLUGIN_PATH
73
def disable_plugins():
74
"""Disable loading plugins.
76
Future calls to load_plugins() will be ignored.
81
def _strip_trailing_sep(path):
82
return path.rstrip("\\/")
85
def set_plugins_path(path=None):
86
"""Set the path for plugins to be loaded from.
88
:param path: The list of paths to search for plugins. By default,
89
path will be determined using get_standard_plugins_path.
90
if path is [], no plugins can be loaded.
93
path = get_standard_plugins_path()
94
_mod_plugins.__path__ = path
98
def _append_new_path(paths, new_path):
99
"""Append a new path if it set and not already known."""
100
if new_path is not None and new_path not in paths:
101
paths.append(new_path)
105
def get_core_plugin_path():
107
bzr_exe = bool(getattr(sys, 'frozen', None))
108
if bzr_exe: # expand path for bzr.exe
109
# We need to use relative path to system-wide plugin
110
# directory because bzrlib from standalone bzr.exe
111
# could be imported by another standalone program
112
# (e.g. bzr-config; or TortoiseBzr/Olive if/when they
113
# will become standalone exe). [bialix 20071123]
114
# __file__ typically is
115
# C:\Program Files\Bazaar\lib\library.zip\bzrlib\plugin.pyc
116
# then plugins directory is
117
# C:\Program Files\Bazaar\plugins
118
# so relative path is ../../../plugins
119
core_path = osutils.abspath(osutils.pathjoin(
120
osutils.dirname(__file__), '../../../plugins'))
121
else: # don't look inside library.zip
122
# search the plugin path before the bzrlib installed dir
123
core_path = os.path.dirname(_mod_plugins.__file__)
127
def get_site_plugin_path():
128
"""Returns the path for the site installed plugins."""
129
if sys.platform == 'win32':
130
# We don't have (yet) a good answer for windows since that is certainly
131
# related to the way we build the installers. -- vila20090821
135
from distutils.sysconfig import get_python_lib
137
# If distutuils is not available, we just don't know where they are
140
site_path = osutils.pathjoin(get_python_lib(), 'bzrlib', 'plugins')
144
def get_user_plugin_path():
145
return osutils.pathjoin(config.config_dir(), 'plugins')
148
def get_standard_plugins_path():
149
"""Determine a plugin path suitable for general use."""
150
# Ad-Hoc default: core is not overriden by site but user can overrides both
151
# The rationale is that:
152
# - 'site' comes last, because these plugins should always be available and
153
# are supposed to be in sync with the bzr installed on site.
154
# - 'core' comes before 'site' so that running bzr from sources or a user
155
# installed version overrides the site version.
156
# - 'user' comes first, because... user is always right.
157
# - the above rules clearly defines which plugin version will be loaded if
158
# several exist. Yet, it is sometimes desirable to disable some directory
159
# so that a set of plugins is disabled as once. This can be done via
160
# -site, -core, -user.
162
env_paths = os.environ.get('BZR_PLUGIN_PATH', '+user').split(os.pathsep)
163
defaults = ['+core', '+site']
165
# The predefined references
166
refs = dict(core=get_core_plugin_path(),
167
site=get_site_plugin_path(),
168
user=get_user_plugin_path())
170
# Unset paths that should be removed
171
for k,v in refs.iteritems():
173
# defaults can never mention removing paths as that will make it
174
# impossible for the user to revoke these removals.
175
if removed in env_paths:
176
env_paths.remove(removed)
181
for p in env_paths + defaults:
182
if p.startswith('+'):
183
# Resolve reference if they are known
187
# Leave them untouched otherwise, user may have paths starting
190
_append_new_path(paths, p)
192
# Get rid of trailing slashes, since Python can't handle them when
193
# it tries to import modules.
194
paths = map(_strip_trailing_sep, paths)
198
def load_plugins(path=None):
199
"""Load bzrlib plugins.
201
The environment variable BZR_PLUGIN_PATH is considered a delimited
202
set of paths to look through. Each entry is searched for *.py
203
files (and whatever other extensions are used in the platform,
206
load_from_dirs() provides the underlying mechanism and is called with
207
the default directory list to provide the normal behaviour.
209
:param path: The list of paths to search for plugins. By default,
210
path will be determined using get_standard_plugins_path.
211
if path is [], no plugins can be loaded.
215
# People can make sure plugins are loaded, they just won't be twice
219
# scan for all plugins in the path.
220
load_from_path(set_plugins_path(path))
223
def load_from_path(dirs):
224
"""Load bzrlib plugins found in each dir in dirs.
226
Loading a plugin means importing it into the python interpreter.
227
The plugin is expected to make calls to register commands when
228
it's loaded (or perhaps access other hooks in future.)
230
Plugins are loaded into bzrlib.plugins.NAME, and can be found there
231
for future reference.
233
The python module path for bzrlib.plugins will be modified to be 'dirs'.
235
# We need to strip the trailing separators here as well as in the
236
# set_plugins_path function because calling code can pass anything in to
237
# this function, and since it sets plugins.__path__, it should set it to
238
# something that will be valid for Python to use (in case people try to
239
# run "import bzrlib.plugins.PLUGINNAME" after calling this function).
240
_mod_plugins.__path__ = map(_strip_trailing_sep, dirs)
244
trace.mutter('looking for plugins in %s', d)
249
# backwards compatability: load_from_dirs was the old name
250
# This was changed in 0.15
251
load_from_dirs = load_from_path
254
def load_from_dir(d):
255
"""Load the plugins in directory d.
257
d must be in the plugins module path already.
259
# Get the list of valid python suffixes for __init__.py?
260
# this includes .py, .pyc, and .pyo (depending on if we are running -O)
261
# but it doesn't include compiled modules (.so, .dll, etc)
262
valid_suffixes = [suffix for suffix, mod_type, flags in imp.get_suffixes()
263
if flags in (imp.PY_SOURCE, imp.PY_COMPILED)]
264
package_entries = ['__init__'+suffix for suffix in valid_suffixes]
266
for f in os.listdir(d):
267
path = osutils.pathjoin(d, f)
268
if os.path.isdir(path):
269
for entry in package_entries:
270
# This directory should be a package, and thus added to
272
if os.path.isfile(osutils.pathjoin(path, entry)):
274
else: # This directory is not a package
277
for suffix_info in imp.get_suffixes():
278
if f.endswith(suffix_info[0]):
279
f = f[:-len(suffix_info[0])]
280
if suffix_info[2] == imp.C_EXTENSION and f.endswith('module'):
281
f = f[:-len('module')]
286
continue # We don't load __init__.py again in the plugin dir
287
elif getattr(_mod_plugins, f, None):
288
trace.mutter('Plugin name %s already loaded', f)
290
# trace.mutter('add plugin name %s', f)
293
for name in plugin_names:
295
exec "import bzrlib.plugins.%s" % name in {}
296
except KeyboardInterrupt:
298
except errors.IncompatibleAPI, e:
299
trace.warning("Unable to load plugin %r. It requested API version "
300
"%s of module %s but the minimum exported version is %s, and "
301
"the maximum is %s" %
302
(name, e.wanted, e.api, e.minimum, e.current))
304
trace.warning("%s" % e)
305
## import pdb; pdb.set_trace()
306
if re.search('\.|-| ', name):
307
sanitised_name = re.sub('[-. ]', '_', name)
308
if sanitised_name.startswith('bzr_'):
309
sanitised_name = sanitised_name[len('bzr_'):]
310
trace.warning("Unable to load %r in %r as a plugin because the "
311
"file path isn't a valid module name; try renaming "
312
"it to %r." % (name, d, sanitised_name))
314
trace.warning('Unable to load plugin %r from %r' % (name, d))
315
trace.log_exception_quietly()
316
if 'error' in debug.debug_flags:
317
trace.print_exception(sys.exc_info(), sys.stderr)
321
"""Return a dictionary of the plugins.
323
Each item in the dictionary is a PlugIn object.
326
for name, plugin in _mod_plugins.__dict__.items():
327
if isinstance(plugin, types.ModuleType):
328
result[name] = PlugIn(name, plugin)
332
class PluginsHelpIndex(object):
333
"""A help index that returns help topics for plugins."""
336
self.prefix = 'plugins/'
338
def get_topics(self, topic):
339
"""Search for topic in the loaded plugins.
341
This will not trigger loading of new plugins.
343
:param topic: A topic to search for.
344
:return: A list which is either empty or contains a single
345
RegisteredTopic entry.
349
if topic.startswith(self.prefix):
350
topic = topic[len(self.prefix):]
351
plugin_module_name = 'bzrlib.plugins.%s' % topic
353
module = sys.modules[plugin_module_name]
357
return [ModuleHelpTopic(module)]
360
class ModuleHelpTopic(object):
361
"""A help topic which returns the docstring for a module."""
363
def __init__(self, module):
366
:param module: The module for which help should be generated.
370
def get_help_text(self, additional_see_also=None, verbose=True):
371
"""Return a string with the help for this topic.
373
:param additional_see_also: Additional help topics to be
376
if not self.module.__doc__:
377
result = "Plugin '%s' has no docstring.\n" % self.module.__name__
379
result = self.module.__doc__
380
if result[-1] != '\n':
382
# there is code duplicated here and in bzrlib/help_topic.py's
383
# matching Topic code. This should probably be factored in
384
# to a helper function and a common base class.
385
if additional_see_also is not None:
386
see_also = sorted(set(additional_see_also))
390
result += 'See also: '
391
result += ', '.join(see_also)
395
def get_help_topic(self):
396
"""Return the modules help topic - its __name__ after bzrlib.plugins.."""
397
return self.module.__name__[len('bzrlib.plugins.'):]
400
class PlugIn(object):
401
"""The bzrlib representation of a plugin.
403
The PlugIn object provides a way to manipulate a given plugin module.
406
def __init__(self, name, module):
407
"""Construct a plugin for module."""
412
"""Get the path that this plugin was loaded from."""
413
if getattr(self.module, '__path__', None) is not None:
414
return os.path.abspath(self.module.__path__[0])
415
elif getattr(self.module, '__file__', None) is not None:
416
path = os.path.abspath(self.module.__file__)
417
if path[-4:] in ('.pyc', '.pyo'):
418
pypath = path[:-4] + '.py'
419
if os.path.isfile(pypath):
423
return repr(self.module)
426
return "<%s.%s object at %s, name=%s, module=%s>" % (
427
self.__class__.__module__, self.__class__.__name__, id(self),
428
self.name, self.module)
432
def test_suite(self):
433
"""Return the plugin's test suite."""
434
if getattr(self.module, 'test_suite', None) is not None:
435
return self.module.test_suite()
439
def load_plugin_tests(self, loader):
440
"""Return the adapted plugin's test suite.
442
:param loader: The custom loader that should be used to load additional
446
if getattr(self.module, 'load_tests', None) is not None:
447
return loader.loadTestsFromModule(self.module)
451
def version_info(self):
452
"""Return the plugin's version_tuple or None if unknown."""
453
version_info = getattr(self.module, 'version_info', None)
454
if version_info is not None:
456
if isinstance(version_info, types.StringType):
457
version_info = version_info.split('.')
458
elif len(version_info) == 3:
459
version_info = tuple(version_info) + ('final', 0)
461
# The given version_info isn't even iteratible
462
trace.log_exception_quietly()
463
version_info = (version_info,)
466
def _get__version__(self):
467
version_info = self.version_info()
468
if version_info is None or len(version_info) == 0:
471
version_string = _format_version_tuple(version_info)
472
except (ValueError, TypeError, IndexError), e:
473
trace.log_exception_quietly()
474
# try to return something usefull for bad plugins, in stead of
476
version_string = '.'.join(map(str, version_info))
477
return version_string
479
__version__ = property(_get__version__)
added
removed
bzrlib/plugin.py
