mirror of https://gitlab.com/openlp/openlp.git
217 lines
8.6 KiB
Python
217 lines
8.6 KiB
Python
# -*- coding: utf-8 -*-
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# vim: autoindent shiftwidth=4 expandtab textwidth=80 tabstop=4 softtabstop=4
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###############################################################################
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# OpenLP - Open Source Lyrics Projection #
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# --------------------------------------------------------------------------- #
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# Copyright (c) 2008-2010 Raoul Snyman #
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# Portions copyright (c) 2008-2010 Tim Bentley, Jonathan Corwin, Michael #
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# Gorven, Scott Guerrieri, Maikel Stuivenberg, Martin Thompson, Jon Tibble, #
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# Carsten Tinggaard #
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# --------------------------------------------------------------------------- #
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# This program is free software; you can redistribute it and/or modify it #
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# under the terms of the GNU General Public License as published by the Free #
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# Software Foundation; version 2 of the License. #
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# #
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# This program is distributed in the hope that it will be useful, but WITHOUT #
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or #
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# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for #
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# more details. #
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# #
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# You should have received a copy of the GNU General Public License along #
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# with this program; if not, write to the Free Software Foundation, Inc., 59 #
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# Temple Place, Suite 330, Boston, MA 02111-1307 USA #
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###############################################################################
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import os
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import sys
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import logging
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from openlp.core.lib import Plugin, PluginStatus
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class PluginManager(object):
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"""
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This is the Plugin manager, which loads all the plugins,
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and executes all the hooks, as and when necessary.
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"""
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global log
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log = logging.getLogger(u'PluginMgr')
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log.info(u'Plugin manager loaded')
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def __init__(self, dir):
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"""
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The constructor for the plugin manager. Passes the controllers on to
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the plugins for them to interact with via their ServiceItems.
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``dir``
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The directory to search for plugins.
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"""
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log.info(u'Plugin manager initing')
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if not dir in sys.path:
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log.debug(u'Inserting %s into sys.path', dir)
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sys.path.insert(0, dir)
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self.basepath = os.path.abspath(dir)
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log.debug(u'Base path %s ', self.basepath)
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self.plugins = []
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# this has to happen after the UI is sorted self.find_plugins(dir)
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log.info(u'Plugin manager Initialised')
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def find_plugins(self, dir, plugin_helpers):
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"""
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Scan the directory ``dir`` for objects inheriting from the ``Plugin``
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class.
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``dir``
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The directory to scan.
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``plugin_helpers``
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A list of helper objects to pass to the plugins.
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"""
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self.plugin_helpers = plugin_helpers
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startdepth = len(os.path.abspath(dir).split(os.sep))
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log.debug(u'find plugins %s at depth %d', unicode(dir), startdepth)
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for root, dirs, files in os.walk(dir):
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for name in files:
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if name.endswith(u'.py') and not name.startswith(u'__'):
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path = os.path.abspath(os.path.join(root, name))
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thisdepth = len(path.split(os.sep))
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if thisdepth-startdepth > 2:
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# skip anything lower down
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continue
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modulename, pyext = os.path.splitext(path)
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prefix = os.path.commonprefix([self.basepath, path])
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# hack off the plugin base path
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modulename = modulename[len(prefix) + 1:]
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modulename = modulename.replace(os.path.sep, '.')
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# import the modules
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log.debug(u'Importing %s from %s. Depth %d',
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modulename, path, thisdepth)
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try:
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__import__(modulename, globals(), locals(), [])
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except ImportError, e:
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log.exception(u'Failed to import module %s on path %s for reason %s',
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modulename, path, e.args[0])
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plugin_classes = Plugin.__subclasses__()
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plugin_objects = []
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for p in plugin_classes:
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try:
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plugin = p(self.plugin_helpers)
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log.debug(u'Loaded plugin %s with helpers', unicode(p))
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plugin_objects.append(plugin)
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except TypeError:
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log.exception(u'loaded plugin %s has no helpers', unicode(p))
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plugins_list = sorted(plugin_objects, self.order_by_weight)
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for plugin in plugins_list:
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if plugin.check_pre_conditions():
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log.debug(u'Plugin %s active', unicode(plugin.name))
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plugin.set_status()
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else:
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plugin.status = PluginStatus.Disabled
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self.plugins.append(plugin)
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def order_by_weight(self, x, y):
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"""
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Sort two plugins and order them by their weight.
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``x``
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The first plugin.
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``y``
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The second plugin.
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"""
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return cmp(x.weight, y.weight)
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def hook_media_manager(self, mediadock):
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"""
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Loop through all the plugins. If a plugin has a valid media manager
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item, add it to the media manager.
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``mediatoolbox``
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The Media Manager itself.
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"""
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for plugin in self.plugins:
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if plugin.status is not PluginStatus.Disabled:
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plugin.media_item = plugin.get_media_manager_item()
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def hook_settings_tabs(self, settingsform=None):
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"""
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Loop through all the plugins. If a plugin has a valid settings tab
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item, add it to the settings tab.
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Tabs are set for all plugins not just Active ones
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``settingsform``
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Defaults to *None*. The settings form to add tabs to.
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"""
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for plugin in self.plugins:
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if plugin.status is not PluginStatus.Disabled:
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plugin.settings_tab = plugin.get_settings_tab()
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if plugin.settings_tab:
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log.debug(u'Inserting settings tab item from %s' %
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plugin.name)
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settingsform.addTab(plugin.name, plugin.settings_tab)
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else:
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log.debug(u'No tab settings in %s' % plugin.name)
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def hook_import_menu(self, import_menu):
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"""
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Loop through all the plugins and give them an opportunity to add an
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item to the import menu.
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``import_menu``
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The Import menu.
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"""
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for plugin in self.plugins:
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if plugin.status is not PluginStatus.Disabled:
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plugin.add_import_menu_item(import_menu)
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def hook_export_menu(self, export_menu):
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"""
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Loop through all the plugins and give them an opportunity to add an
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item to the export menu.
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``export_menu``
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The Export menu.
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"""
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for plugin in self.plugins:
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if plugin.status is not PluginStatus.Disabled:
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plugin.add_export_menu_item(export_menu)
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def hook_tools_menu(self, tools_menu):
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"""
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Loop through all the plugins and give them an opportunity to add an
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item to the tools menu.
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``tools_menu``
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The Tools menu.
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"""
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for plugin in self.plugins:
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if plugin.status is not PluginStatus.Disabled:
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plugin.add_tools_menu_item(tools_menu)
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def initialise_plugins(self):
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"""
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Loop through all the plugins and give them an opportunity to
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initialise themselves.
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"""
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for plugin in self.plugins:
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log.info(u'initialising plugins %s in a %s state'
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% (plugin.name, plugin.is_active()))
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if plugin.is_active():
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plugin.initialise()
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log.info(u'Initialisation Complete for %s ' % plugin.name)
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if not plugin.is_active():
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plugin.remove_toolbox_item()
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def finalise_plugins(self):
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"""
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Loop through all the plugins and give them an opportunity to
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clean themselves up
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"""
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log.info(u'finalising plugins')
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for plugin in self.plugins:
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if plugin.is_active():
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plugin.finalise()
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log.info(u'Finalisation Complete for %s ' % plugin.name)
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