Add |git cl description| to allow you to change the description in your favorite $EDITOR.

git_cl.py

 #!/usr/bin/env python
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Copyright (C) 2008 Evan Martin <martine@danga.com>
 
 """A git-command for integrating reviews on Rietveld."""
 
 import json
@@ skipping 1102 matching lines @@
       else:
         color = Fore.BLUE
       print '\n%s%s  %s%s' % (
           color, message['date'].split('.', 1)[0], message['sender'],
           Fore.RESET)
       if message['text'].strip():
         print '\n'.join('  ' + l for l in message['text'].splitlines())
   return 0
 
 
+def CMDdescription(parser, args):
+  """brings up the editor for the current CL's description."""
+  cl = Changelist()
+  if not cl.GetIssue():
+    DieWithError('This branch has no associated changelist.')
+  description = ChangeDescription(cl.GetDescription())
+  description.prompt()
+  cl.UpdateDescription(description.description)
+  return 0
+
+
 def CreateDescriptionFromLog(args):
   """Pulls out the commit log to use as a base for the CL description."""
   log_args = []
   if len(args) == 1 and not args[0].endswith('.'):
     log_args = [args[0] + '..']
   elif len(args) == 1 and args[0].endswith('...'):
     log_args = [args[0][:-1]]
   elif len(args) == 2:
     log_args = [args[0] + '..' + args[1]]
   else:
@@ skipping 947 matching lines @@
   GenUsage(parser, 'help')
   return CMDhelp(parser, argv)
 
 
 if __name__ == '__main__':
   # These affect sys.stdout so do it outside of main() to simplify mocks in
   # unit testing.
   fix_encoding.fix_encoding()
   colorama.init()
   sys.exit(main(sys.argv[1:]))