Allow multiple plugins to bind to one command name!

They will get called in a list, one after the other. The "help" command is able to distinguish with this too.

coreplugin.py

@@ -25,13 +25,12 @@ def handle_commands(irc, source, command, args):
         cmd_args = text.split(' ')
         cmd = cmd_args[0].lower()
         cmd_args = cmd_args[1:]
-        try:
-            func = world.bot_commands[cmd]
-        except KeyError:
+        if cmd not in world.bot_commands:
             utils.msg(irc, source, 'Error: Unknown command %r.' % cmd)
             return
-        try:
         log.info('(%s) Calling command %r for %s', irc.name, cmd, utils.getHostmask(irc, source))
+        for func in world.bot_commands[cmd]:
+            try:
                 func(irc, source, cmd_args)
             except Exception as e:
                 log.exception('Unhandled exception caught in command %r', cmd)

plugins/commands.py

@@ -63,20 +63,26 @@ def help(irc, source, args):
     except IndexError:  # No argument given, just return 'list' output
         listcommands(irc, source, args)
         return
-    try:
-        func = world.bot_commands[command]
-    except KeyError:
+    if command not in world.bot_commands:
         utils.msg(irc, source, 'Error: Unknown command %r.' % command)
         return
     else:
+        funcs = world.bot_commands[command]
+        if len(funcs) > 1:
+            utils.msg(irc, source, 'The following \x02%s\x02 plugins bind to the \x02%s\x02 command: %s'
+                      % (len(funcs), command, ', '.join([func.__module__ for func in funcs])))
+        for func in funcs:
             doc = func.__doc__
+            mod = func.__module__
             if doc:
                 lines = doc.split('\n')
                 # Bold the first line, which usually just tells you what
                 # arguments the command takes.
-            lines[0] = '\x02%s %s\x02' % (command, lines[0])
+                lines[0] = '\x02%s %s\x02 (plugin: %r)' % (command, lines[0], mod)
                 for line in lines:
                     utils.msg(irc, source, line.strip())
             else:
-            utils.msg(irc, source, 'Error: Command %r doesn\'t offer any help.' % command)
+                utils.msg(irc, source, "Error: Command %r (from plugin %r) "
+                                       "doesn't offer any help." % (command, mod))
                 return
+

utils.py

@@ -108,7 +108,7 @@ def add_cmd(func, name=None):
     if name is None:
         name = func.__name__
     name = name.lower()
-    world.bot_commands[name] = func
+    world.bot_commands[name].append(func)
 
 def add_hook(func, command):
     """Add a hook <func> for command <command>."""

world.py

@@ -9,7 +9,7 @@ testing = True
 
 global bot_commands, command_hooks
 # This should be a mapping of command names to functions
-bot_commands = {}
+bot_commands = defaultdict(list)
 command_hooks = defaultdict(list)
 networkobjects = {}
 schedulers = {}