After lots of discussions, default commands where moved from game/gamesrc/commands/default to src/commands/default in order to make it clearer which parts are updated as part of evennia and which can be tweaked at heart's content. New templates where left in gamesrc/commands that should hopefully make it clearer how to extend the command system. Also game/web was moved to src/web - we'll likely extend this from game/gamesrc/web in the future. If you already did extensions you should just have to edit your import paths and make use of the new cmdset template supplied.

The unit testing was for commands was split out from src/objects/tests.py into the new src/commands/default/test.py in order to keep the testing modules thematically grouped with the things they are testing.

src/commands/cmdset.py

@@ -204,13 +204,22 @@ class CmdSet(object):
         """
         Add a command to this cmdset.
 
-        Note that if cmd already has 
+        Note that if cmd already exists in set,
+        it will replace the old one (no priority checking etc 
+        at this point; this is often used to overload 
+        default commands). 
         """
         cmd = instantiate(cmd)
+
         if cmd:
             if not hasattr(cmd, 'obj'):
                 cmd.obj = self.cmdsetobj
-            self.commands.append(cmd)
+            try:
+                ic = self.commands.index(cmd)
+                self.commands[ic] = cmd # replace 
+            except ValueError:
+                self.commands.append(cmd) 
+            # extra run to make sure to avoid doublets
             self.commands = list(set(self.commands))
 
     def remove(self, cmd):