text: # Copyright 2016 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.
  
  import os.path
  import time
  
  def CheckChangeOnUpload(input_api, output_api):
    """Warn when changing md_history without vulcanizing."""
  
    def _is_md_history_file(path):
      return (path.startswith('chrome/browser/resources/md_history') and
              (not path.endswith('externs.js')) and
              (not path.endswith('crisper.js')) and
              (not path.endswith('vulcanized.html')) and
              (path.endswith('js') or path.endswith('html')))
  
    paths = [x.LocalPath() for x in input_api.change.AffectedFiles()]
    earliest_vulcanize_change = min(os.path.getmtime(x) for x in
                                    ['app.vulcanized.html',
                                     'app.crisper.js',
                                     'lazy_load.vulcanized.html',
                                     'lazy_load.crisper.js'])
    history_changes = filter(_is_md_history_file, paths)
    latest_history_change = 0
    if history_changes:
      latest_history_change = max(os.path.getmtime(os.path.split(x)[1]) for x in
                                  history_changes)
  
    if latest_history_change > earliest_vulcanize_change:
      return [output_api.PresubmitPromptWarning(
          'Vulcanize must be run when changing files in md_history. See '
          'docs/vulcanize.md.')]
    return []
  