new_contents: #!/usr/bin/python
  # Copyright (c) 2011 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.
  
  """Verifies that the message tags in the 2nd and subsequent JSON message files
  match those specified in the first.  This is typically run when the
  translations are updated before a release, to check that nothing got missed.
  """
  
  import json
  import sys
  import string
  
  def CheckTranslation(filename, translation, messages):
    """Check |messages| for missing Ids in |translation|, and similarly for unused
       Ids.  If there are missing/unused Ids then report them and return failure.
    """
    message_tags = set(map(string.lower, messages.keys()))
    translation_tags = set(map(string.lower, translation.keys()))
    if message_tags == translation_tags:
      return True
  
    undefined_tags = message_tags - translation_tags
    if undefined_tags:
      print '%s: Missing: %s' % (filename, ", ".join(undefined_tags))
  
    unused_tags = translation_tags - message_tags
    if unused_tags:
      print '%s: Unused: %s' % (filename, ", ".join(unused_tags))
  
    return False
  
  def main():
    if len(sys.argv) < 3:
      print 'Usage: verify-translations.py <messages> <translation-files...>'
      sys.exit(1)
  
    en_messages = json.load(open(sys.argv[1], 'r'))
    exit_code = 0
    for f in sys.argv[2:]:
      translation = json.load(open(f, 'r'))
      if not CheckTranslation(f, translation, en_messages):
        exit_code = 1
  
    sys.exit(exit_code)
  
  if __name__ == '__main__':
    main()
  
subject: Add verify-translations.py script.