Add "gcl rename <old-name> <new-name>" subcommand.

gcl.py

 #!/usr/bin/python
 # Copyright (c) 2006-2009 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.
 
 """Wrapper script around Rietveld's upload.py that groups files into
 changelists."""
 
 import getpass
 import os
@@ skipping 643 matching lines @@
    gcl diff change_name
       Diffs all files in the changelist.
 
    gcl presubmit change_name
       Runs presubmit checks without uploading the changelist.
 
    gcl diff
       Diffs all files in the current directory and subdirectories that aren't in
       a changelist.
 
+   gcl description
+      Prints the description of the specified change to stdout.
+
    gcl changes
       Lists all the the changelists and the files in them.
 
    gcl rename <old-name> <new-name>
       Renames an existing change.
 
    gcl nothave [optional directory]
       Lists files unknown to Subversion.
 
    gcl opened
@@ skipping 538 matching lines @@
   fail_on_not_found = command != "try" and command != "change"
   if command == "try" and changename.find(',') != -1:
     change_info = LoadChangelistInfoForMultiple(changename, GetRepositoryRoot(),
                                                 True, True)
   else:
     change_info = ChangeInfo.Load(changename, GetRepositoryRoot(),
                                   fail_on_not_found, True)
 
   if command == "change":
     Change(change_info, argv[3:])
+  if command == "description":
+    print change_info.description
   elif command == "lint":
     Lint(change_info, argv[3:])
   elif command == "upload":
     UploadCL(change_info, argv[3:])
   elif command == "presubmit":
     PresubmitCL(change_info)
   elif command in ("commit", "submit"):
     Commit(change_info, argv[3:])
   elif command == "delete":
     change_info.Delete()
@@ skipping 13 matching lines @@
       return 0
     args =["svn", command]
     root = GetRepositoryRoot()
     args.extend([os.path.join(root, x) for x in change_info.GetFileNames()])
     RunShell(args, True)
   return 0
 
 
 if __name__ == "__main__":
   sys.exit(main())