sugar-toolkit-gtk3/services/shell/bundleregistry.py

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# Copyright (C) 2006-2007 Red Hat, Inc.
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#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
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#
# This program is distributed in the hope that it will be useful,
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# 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.
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#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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import os
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import gobject
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from sugar.bundle.activitybundle import ActivityBundle
from sugar.bundle.bundle import MalformedBundleException
from sugar import env
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from sugar import util
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# http://standards.freedesktop.org/basedir-spec/basedir-spec-0.6.html
def _get_data_dirs():
if os.environ.has_key('XDG_DATA_DIRS'):
return os.environ['XDG_DATA_DIRS'].split(':')
else:
return [ '/usr/local/share/', '/usr/share/' ]
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def _load_mime_defaults():
defaults = {}
f = open(env.get_data_path('mime.defaults'), 'r')
for line in f.readlines():
line = line.strip()
if line and not line.startswith('#'):
mime = line[:line.find(' ')]
handler = line[line.rfind(' ') + 1:]
defaults[mime] = handler
f.close()
return defaults
class _ServiceManager(object):
"""Internal class responsible for creating dbus service files
DBUS services are defined in files which bind a service name
to the name of an executable which provides the service name.
In Sugar, the service files are automatically generated from
the activity registry (by this class). When an activity's
dbus launch service is requested, dbus will launch the
specified executable in order to allow it to provide the
requested activity-launching service.
In the case of activities which provide a "class", instead of
an "exec" attribute in their activity.info, the
sugar-activity-factory script is used with an appropriate
argument to service that bundle.
"""
SERVICE_DIRECTORY = '~/.local/share/dbus-1/services'
def __init__(self):
service_dir = os.path.expanduser(self.SERVICE_DIRECTORY)
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if not os.path.isdir(service_dir):
os.makedirs(service_dir)
self._path = service_dir
def add(self, bundle):
util.write_service(bundle.get_service_name(),
bundle.get_command(), self._path)
def remove(self, bundle):
util.delete_service(bundle.get_service_name(), self._path)
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class BundleRegistry(gobject.GObject):
"""Service that tracks the available activity bundles"""
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__gsignals__ = {
'bundle-added': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
([gobject.TYPE_PYOBJECT])),
'bundle-removed': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
([gobject.TYPE_PYOBJECT]))
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}
def __init__(self):
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gobject.GObject.__init__(self)
self._bundles = []
self._search_path = []
self._service_manager = _ServiceManager()
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self._mime_defaults = _load_mime_defaults()
def get_bundle(self, service_name):
"""Returns an bundle given his service name"""
for bundle in self._bundles:
if bundle.get_service_name() == service_name:
return bundle
return None
def add_search_path(self, path):
"""Add a directory to the bundles search path"""
self._search_path.append(path)
self._scan_directory(path)
def __iter__(self):
return self._bundles.__iter__()
def _scan_directory(self, path):
if not os.path.isdir(path):
return
# Sort by mtime to ensure a stable activity order
bundles = {}
for f in os.listdir(path):
if not f.endswith('.activity'):
continue
bundle_dir = os.path.join(path, f)
if os.path.isdir(bundle_dir):
bundles[bundle_dir] = os.stat(bundle_dir).st_mtime
bundle_dirs = bundles.keys()
bundle_dirs.sort(lambda d1,d2: cmp(bundles[d1], bundles[d2]))
for dir in bundle_dirs:
self.add_bundle(dir)
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def add_bundle(self, bundle_path):
try:
bundle = ActivityBundle(bundle_path)
except MalformedBundleException:
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return False
self._bundles.append(bundle)
self._service_manager.add(bundle)
self.emit('bundle-added', bundle)
return True
def remove_bundle(self, bundle_path):
for bundle in self._bundles:
if bundle.get_path() == bundle_path:
self._bundles.remove(bundle)
self._service_manager.remove(bundle)
self.emit('bundle-removed', bundle)
return True
return False
def get_activities_for_type(self, mime_type):
result = []
for bundle in self._bundles:
if bundle.get_mime_types() and mime_type in bundle.get_mime_types():
if self.get_default_for_type(mime_type) == bundle.get_service_name():
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result.insert(0, bundle)
else:
result.append(bundle)
return result
def get_default_for_type(self, mime_type):
if self._mime_defaults.has_key(mime_type):
return self._mime_defaults[mime_type]
else:
return None
def get_registry():
return _bundle_registry
_bundle_registry = BundleRegistry()
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for path in _get_data_dirs():
bundles_path = os.path.join(path, 'activities')
_bundle_registry.add_search_path(bundles_path)
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_bundle_registry.add_search_path(env.get_user_activities_path())