From cb2ddfbcbf9e7afd211491a553191fe5508f9cb9 Mon Sep 17 00:00:00 2001
From: Keegi <keegi@spamcop.net>
Date: Wed, 1 Jun 2011 20:49:12 +0300
Subject: [PATCH] Prevent overwriting built-in commands with aliases, as it
 would delete access to the built-in command permanently

---
 pronsole.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/pronsole.py b/pronsole.py
index 75611c8..cae06e0 100644
--- a/pronsole.py
+++ b/pronsole.py
@@ -99,6 +99,9 @@ class pronsole(cmd.Cmd):
                 print "Alias '"+alias_name+"' is not defined"
             return
         # (re)define an alias
+        if alias_name not in self.aliases.keys() and hasattr(self.__class__,"do_"+alias_name):
+            print "Name '"+alias_name+"' is already being used by built-in command"
+            return
         func = lambda self,args,alias_def=alias_def: self.onecmd(" ".join((alias_def,args)))
         self.aliases[alias_name] = alias_def
         setattr(self.__class__,"do_"+alias_name,func)