Added arg_regex, an optional Command class-method for customizing how commands are identified by using a regex to enforce a specific look/grammar to the command argument. Discussed and suggested in issue 213.

src/commands/cmdparser.py

@@ -47,9 +47,11 @@ def cmdparser(raw_string, cmdset, caller, match_index=None):
     l_raw_string = raw_string.lower()
     for cmd in cmdset:        
         matches.extend([create_match(cmdname, raw_string, cmd)
-                        for cmdname in [cmd.key] + cmd.aliases 
-                        if cmdname and l_raw_string.startswith(cmdname.lower())])
-    if not matches:                        
+                        for cmdname in [cmd.key] + cmd.aliases
+                        if cmdname and l_raw_string.startswith(cmdname.lower())
+                        and (not cmd.arg_regex or
+                             cmd.arg_regex.match(l_raw_string[len(cmdname):]))])
+    if not matches:
         # no matches found. 
         if '-' in raw_string:
             # This could be due to the user trying to identify the

src/commands/command.py

@@ -5,6 +5,7 @@ All commands in Evennia inherit from the 'Command' class in this module.
 
 """
 
+import re
 from src.locks.lockhandler import LockHandler
 from src.utils.utils import is_iter
 
@@ -42,6 +43,11 @@ class CommandMeta(type):
             temp.append(lockstring)
         mcs.lock_storage = ";".join(temp)
 
+        if hasattr(mcs, 'arg_regex') and isinstance(mcs.arg_regex, basestring):
+            mcs.arg_regex = re.compile(r"%s" % mcs.arg_regex, re.I)
+        else:
+            mcs.arg_regex = None
+
         if not hasattr(mcs, 'is_exit'):
             mcs.is_exit = False 
         if not hasattr(mcs, "help_category"):

src/commands/default/general.py

@@ -49,6 +49,7 @@ class CmdLook(MuxCommand):
     key = "look"
     aliases = ["l", "ls"]
     locks = "cmd:all()"
+    arg_regex = r"\s.*?|$"
 
     def func(self):
         """

src/objects/objects.py

@@ -500,6 +500,7 @@ class Exit(Object):
             """
             locks = "cmd:all()" # should always be set to this.            
             obj = None
+            arg_regex=r"\s.*?|$"
 
             def func(self):
                 "Default exit traverse if no syscommand is defined."