Add --stat option to git-cl diff

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 and Gerrit."""
 
 from __future__ import print_function
@@ skipping 4856 matching lines @@
   cl = Changelist(auth_config=auth_config, issue=options.issue,
                   codereview=options.forced_codereview)
   # Ensure there actually is an issue to close.
   cl.GetDescription()
   cl.CloseIssue()
   return 0
 
 
 def CMDdiff(parser, args):
   """Shows differences between local tree and last upload."""
+  parser.add_option(
+      '--stat',
+      action='store_true',
+      dest='stat',
+      help='Generate a diffstat')
   auth.add_auth_options(parser)
   options, args = parser.parse_args(args)
   auth_config = auth.extract_auth_config_from_options(options)
   if args:
     parser.error('Unrecognized args: %s' % ' '.join(args))
 
   # Uncommitted (staged and unstaged) changes will be destroyed by
   # "git reset --hard" if there are merging conflicts in CMDPatchIssue().
   # Staged changes would be committed along with the patch from last
   # upload, hence counted toward the "last upload" side in the final
@@ skipping 15 matching lines @@
   # properties.
   cl.ClearBranch()
   try:
     rtn = cl.CMDPatchIssue(issue, reject=False, nocommit=False, directory=None)
     if rtn != 0:
       RunGit(['reset', '--hard'])
       return rtn
 
     # Switch back to starting branch and diff against the temporary
     # branch containing the latest rietveld patch.
-    subprocess2.check_call(['git', 'diff', TMP_BRANCH, branch, '--'])
+    cmd = ['git', 'diff']
+    if options.stat:
+      cmd.append('--stat')
+    cmd.extend([TMP_BRANCH, branch, '--'])
+    subprocess2.check_call(cmd)
   finally:
     RunGit(['checkout', '-q', branch])
     RunGit(['branch', '-D', TMP_BRANCH])
 
   return 0
 
 
 def CMDowners(parser, args):
   """Interactively find the owners for reviewing."""
   parser.add_option(
@@ skipping 294 matching lines @@
 if __name__ == '__main__':
   # These affect sys.stdout so do it outside of main() to simplify mocks in
   # unit testing.
   fix_encoding.fix_encoding()
   setup_color.init()
   try:
     sys.exit(main(sys.argv[1:]))
   except KeyboardInterrupt:
     sys.stderr.write('interrupted\n')
     sys.exit(1)