nephilim/plugins/__init__.py

   1 #
   2 #    Copyright (C) 2009 Anton Khirnov <wyskas@gmail.com>
   3 #
   4 #    Nephilim is free software: you can redistribute it and/or modify
   5 #    it under the terms of the GNU General Public License as published by
   6 #    the Free Software Foundation, either version 3 of the License, or
   7 #    (at your option) any later version.
   8 #
   9 #    Nephilim is distributed in the hope that it will be useful,
  10 #    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 #    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 #    GNU General Public License for more details.
  13 #
  14 #    You should have received a copy of the GNU General Public License
  15 #    along with Nephilim.  If not, see <http://www.gnu.org/licenses/>.
  16 #
  17
  18
  19 import sys
  20 import logging
  21
  22 __all__ = ['AlbumCover', 'Filebrowser', 'Library', 'Lyrics', 'Notify', 'PlayControl',
  23            'Playlist', 'Songinfo', 'Systray']
  24
  25 class Plugins:
  26     _plugins   = None
  27     parent = None
  28     mpclient   = None
  29
  30     def __init__(self, parent, mpclient):
  31         """load all modules in the plugins directory."""
  32         self._plugins = {}
  33         self.parent   = parent
  34         self.mpclient = mpclient
  35
  36         for name in __all__:
  37             self.__init_plugin(name)
  38
  39     def __init_plugin(self, name):
  40         try:
  41             if name in sys.modules:
  42                 reload(sys.modules[name])
  43                 module = sys.modules[name]
  44             else:
  45                 module = __import__(name, globals(), locals(), [], 1)
  46         except (SyntaxError, ImportError), e:
  47             logging.error('Failed to initialize plugin %s: %s.'%(name, e))
  48             return False
  49
  50         self._plugins[name] = eval('module.%s(self.parent, self.mpclient, \'%s\')'%(name, name))
  51         return True
  52
  53     def plugin(self, name):
  54         """Returns a plugin with the specified name. It is illegal to access
  55            any functions if the plugin is unloaded."""
  56         return self._plugins[name] if name in self._plugins else None
  57
  58     def load(self, name):
  59         """Loads an unloaded plugin."""
  60         if not name in self._plugins:
  61             if not self.__init_plugin(name):
  62                 return False
  63
  64         self._plugins[name].load()
  65         return True
  66
  67     def unload(self, name):
  68         """Unloads a loaded plugin."""
  69         if name in self._plugins:
  70             if self._plugins[name].loaded:
  71                 self._plugins[name].unload()
  72
  73     def plugins(self):
  74         """Returns all available plugins. It is illegal to access any functions
  75            if the plugin is unloaded."""
  76         return self._plugins.values()
  77
  78     def loaded_plugins(self):
  79         """Returns all loaded plugins."""
  80         list = []
  81         for plugin in self._plugins.values():
  82             if plugin.loaded:
  83                 list.append(plugin)
  84         return list