Merge pull request #400 from python-cmd2/complete_alias

Completing alias names in value field of alias command since aliases …

Author: tleonhardt

cmd2/cmd2.py

@@ -2142,13 +2142,15 @@ def do_alias(self, arglist):
                 errmsg = "Aliases can not contain: {}".format(invalidchars)
                 self.perror(errmsg, traceback_war=False)
 
-
     def complete_alias(self, text, line, begidx, endidx):
         """ Tab completion for alias """
+        alias_names = set(self.aliases.keys())
+        visible_commands = set(self.get_visible_commands())
+
         index_dict = \
             {
-                1: self.aliases,
-                2: self.get_visible_commands()
+                1: alias_names,
+                2: list(alias_names | visible_commands)
             }
         return self.index_based_complete(text, line, begidx, endidx, index_dict, self.path_complete)