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###############################################################################
#
# This file is part of the Utopia Documents application.
# Copyright (c) 2008-2014 Lost Island Labs
# <info@utopiadocs.com>
#
# Utopia Documents is free software: you can redistribute it and/or modify
# it under the terms of the GNU GENERAL PUBLIC LICENSE VERSION 3 as
# published by the Free Software Foundation.
#
# Utopia Documents is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
# Public License for more details.
#
# In addition, as a special exception, the copyright holders give
# permission to link the code of portions of this program with the OpenSSL
# library under certain conditions as described in each individual source
# file, and distribute linked combinations including the two.
#
# You must obey the GNU General Public License in all respects for all of
# the code used other than OpenSSL. If you modify file(s) with this
# exception, you may extend this exception to your version of the file(s),
# but you are not obligated to do so. If you do not wish to do so, delete
# this exception statement from your version.
#
# You should have received a copy of the GNU General Public License
# along with Utopia Documents. If not, see <http://www.gnu.org/licenses/>
#
###############################################################################
import os, sys, fnmatch, uuid, inspect
# Define metaclass for managing extensions
class MetaExtension(type):
__extensions = dict()
def _typeName(cls):
return "%s.%s" % (cls.__module__, cls.__name__)
def __init__(cls, name, bases, attrs):
# Keep track of subclasses of Extension
if not attrs.get('__module__', '').startswith('utopia.') and not cls.__name__.startswith('_'):
cls.__extensions[cls._typeName()] = cls
cls.__uuid__ = uuid.uuid4().urn
print ' Found', cls
# Give this class' module the name of its loaded plugin
inspect.getmodule(cls).__dict__['__plugin__'] = inspect.stack()[-3][0].f_globals['__name__']
def __del__(cls):
# Keep track of subclasses of Extension
del cls.__extensions[cls._typeName()]
def types(cls):
return tuple([c for c in cls.__extensions.values() if issubclass(c, cls) and c != cls])
def typeNames(cls):
return [n for (n, c) in cls.__extensions.iteritems() if issubclass(c, cls) and c != cls]
def typeOf(cls, name):
return cls.__extensions[name]
def describe(cls, name):
return str(cls.__doc__).strip()
# Abstract base class for extensions
class Extension(object):
__metaclass__ = MetaExtension
def uuid(self):
return getattr(self, '__uuid__', None)
# Clear up directory of cached Python plugins
def cleanPluginDir(dir):
print 'Cleaning path:', dir
if os.path.isdir(dir):
# Clear up dir
for doomed in os.listdir(dir):
if fnmatch.fnmatch(doomed, '[!_]*.py[co]'):
os.unlink(os.path.join(dir, doomed))
def _makeLoader(module_path):
class Loader:
def get_data(self, data_path):
try:
path = os.path.join(module_path, data_path)
return open(path, 'r').read()
except:
pass
return Loader()
# Load all extensions from a given plugin object
def loadPlugin(path):
print "Loading extensions from:", path
dir, p = os.path.split(path)
if os.path.isdir(path):
if fnmatch.fnmatch(p, '[!_]*.zip'):
try:
sys.path.append(os.path.join(dir, p, 'python'))
mod = __import__(os.path.splitext(p)[0])
mod.__file__ = path
mod.__loader__ = _makeLoader(path)
sys.path.pop()
except Exception, e:
print "Failed to load %s\n%s" % (p, e)
else:
# Attempt to load the plugin
if fnmatch.fnmatch(path, '[!_]*.py'):
try:
sys.path.append(dir)
__import__(os.path.splitext(p)[0]).__file__ = path
sys.path.pop()
except Exception, e:
print "Failed to load %s\n%s" % (p, e)
elif fnmatch.fnmatch(p, '[!_]*.zip'):
try:
sys.path.append(os.path.join(dir, p, 'python'))
__import__(os.path.splitext(p)[0]).__file__ = path
sys.path.pop()
except Exception, e:
print "Failed to load %s\n%s" % (p, e)
__all__ = ['Extension', 'loadPlugin']
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