merge default into plugins branch. So that branch is still up to date too

1 files changed, 116 insertions, 0 deletions

diff --git a/src/plugin_manager.py b/src/plugin_manager.py
new file mode 100644
index 00000000..1f0e89eb
--- /dev/null
+++ b/src/plugin_manager.py
@@ -0,0 +1,116 @@
+import imp
+import os
+import sys
+from config import config
+from gettext import gettext as _
+
+plugins_dir = config.get('plugins_dir', '')
+plugins_dir = plugins_dir or\
+    os.path.join(os.environ.get('XDG_DATA_HOME') or\
+                     os.path.join(os.environ.get('HOME'), '.local', 'share'),
+                 'poezio', 'plugins')
+
+config_home = os.environ.get("XDG_CONFIG_HOME")
+if not config_home:
+    config_home = os.path.join(os.environ.get('HOME'), '.config')
+plugins_conf_dir = os.path.join(config_home, 'poezio', 'plugins')
+
+try:
+    os.makedirs(plugins_dir)
+except OSError:
+    pass
+
+try:
+    os.makedirs(plugins_conf_dir)
+except OSError:
+    pass
+
+sys.path.append(plugins_dir)
+
+class PluginManager(object):
+    def __init__(self, core):
+        self.core = core
+        self.modules = {} # module name -> module object
+        self.plugins = {} # module name -> plugin object
+        self.commands = {} # module name -> dict of commands loaded for the module
+        self.event_handlers = {} # module name -> list of event_name/handler pairs loaded for the module
+
+    def load(self, name):
+        if name in self.plugins:
+            self.plugins[name].unload()
+
+        try:
+            if name in self.modules:
+                imp.acquire_lock()
+                module = imp.reload(self.modules[name])
+                imp.release_lock()
+            else:
+                file, filename, info = imp.find_module(name, [plugins_dir])
+                imp.acquire_lock()
+                module = imp.load_module(name, file, filename, info)
+                imp.release_lock()
+        except Exception as e:
+            import traceback
+            self.core.information(_("Could not load plugin: ") + traceback.format_exc(), 'Error')
+            return
+        finally:
+            if imp.lock_held():
+                imp.release_lock()
+
+        self.modules[name] = module
+        self.commands[name] = {}
+        self.event_handlers[name] = []
+        self.plugins[name] = module.Plugin(self, self.core, plugins_conf_dir)
+
+    def unload(self, name):
+        if name in self.plugins:
+            try:
+                for command in self.commands[name].keys():
+                    del self.core.commands[command]
+                for event_name, handler in self.event_handlers[name]:
+                    self.core.xmpp.del_event_handler(event_name, handler)
+
+                self.plugins[name].unload()
+                del self.plugins[name]
+                del self.commands[name]
+                del self.event_handlers[name]
+            except Exception as e:
+                import traceback
+                self.core.information(_("Could not unload plugin (may not be safe to try again): ") + traceback.format_exc())
+
+    def add_command(self, module_name, name, handler, help, completion=None):
+        if name in self.core.commands:
+            raise Exception(_("Command '%s' already exists") % (name,))
+
+        commands = self.commands[module_name]
+        commands[name] = (handler, help, completion)
+        self.core.commands[name] = (handler, help, completion)
+
+    def add_event_handler(self, module_name, event_name, handler):
+        eh = self.event_handlers[module_name]
+        eh.append((event_name, handler))
+        self.core.xmpp.add_event_handler(event_name, handler)
+
+    def del_event_handler(self, module_name, event_name, handler):
+        self.core.xmpp.del_event_handler(event_name, handler)
+        eh = self.event_handlers[module_name]
+        eh = list(filter(lambda e : e != (event_name, handler), eh))
+
+    def completion_load(self, the_input):
+        """
+        completion function that completes the name of the plugins, from
+        all .py files in plugins_dir
+        """
+        try:
+            names = os.listdir(plugins_dir)
+        except OSError as e:
+            self.core.information(_('Completion failed: %s' % e), 'Error')
+            return
+        plugins_files = [name[:-3] for name in names if name.endswith('.py')]
+        return the_input.auto_completion(plugins_files, '')
+
+    def completion_unload(self, the_input):
+        """
+        completion function that completes the name of the plugins that are loaded
+        """
+        return the_input.auto_completion(list(self.plugins.keys()), '')