From f27556747896aeb891ce71cfdd0ac349d68c5b3d Mon Sep 17 00:00:00 2001
From: Florent Le Coz <louiz@louiz.org>
Date: Sat, 24 Sep 2011 22:26:31 +0200
Subject: [teisenbe] Use the imp module to import modules. Also add a simple
 translator module

---
 src/plugin_manager.py | 77 +++++++++++++++++++++++++++++++++++++++++++++------
 1 file changed, 69 insertions(+), 8 deletions(-)

(limited to 'src/plugin_manager.py')

diff --git a/src/plugin_manager.py b/src/plugin_manager.py
index 3f900e39..8301f5f8 100644
--- a/src/plugin_manager.py
+++ b/src/plugin_manager.py
@@ -1,25 +1,86 @@
+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')
+try:
+    os.makedirs(plugins_dir)
+except OSError:
+    pass
+
+sys.path.append(plugins_dir)
+
 class PluginManager(object):
     def __init__(self, core):
         self.core = core
-        self.plugins = {}
+        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:
-            code = compile(open(name).read(), name, 'exec')
-            from plugin import BasePlugin
-            globals = { 'BasePlugin' : BasePlugin }
-            exec(code, globals)
-            self.plugins[name] = globals['Plugin'](self.core)
+            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:
-            self.core.information("Could not load plugin: %s" % (e,))
+            import traceback
+            self.core.information(_("Could not load plugin: ") + traceback.format_exc())
+            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)
 
     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:
-                self.core.information("Could not unload plugin (may not be safe to try again): %s" % (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))
-- 
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