Aesthetics finalized for cmd_alias

Added RollbackImporter skeleton class to Evennia Server class

commands/objmanip.py

@@ -110,11 +110,12 @@ def cmd_alias(cdat):
    duplicates = Attribute.objects.filter(attr_name="ALIAS").filter(attr_value=eq_args[1])
    
    if duplicates:
-      session.msg("Alias already exists.")
+      session.msg("Alias '%s' already exists." % (eq_args[1],))
       return
    else:
       if pobject.controls_other(target):
          target.set_attribute('ALIAS', eq_args[1])
+         session.msg("Alias %s (%s) added." % (target.get_name(), eq_args[1]))
 
 def cmd_wipe(cdat):
    """

server.py

@@ -21,6 +21,29 @@ import initial_setup
 
 class EvenniaService(service.Service):
 
+   class RollbackImporter(object):
+      def __init__(self):
+         "Creates an instance and installs as the global importer"
+         self.previousModules = sys.modules.copy()
+         self.realImport = __builtin__.__import__
+         __builtin__.__import__ = self._import
+         self.newModules = {}
+
+      def _import(self, name, globals=None, locals=None, fromlist=[]):
+         result = apply(self.realImport, (name, globals, locals, fromlist))
+         self.NewModules[name] = 1
+         return result
+
+      def uninstall(self):
+         for modname in self.newModules.keys():
+            if not self.previousModules.has_key(modname):
+               # Force reload when modname next imported
+               del(sys.modules[modname])
+         __builtin__.__import__ = self.realImport
+
+      def reloadAll(self):
+         pass
+
    def __init__(self, filename="blah"):
       log.startLogging(open(settings.LOGFILE, 'w'))
       self.cmd_alias_list = {}