Revert 255357 "Change the user action file format from .txt to ...."

trunk/src/tools/metrics/common/diff_util.py

-# Copyright 2014 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.
-
-"""Utility functions for prompting user if changes automatically applied to some
-user-managed files are correct.
-"""
-
-import logging
-import os
-import webbrowser
-
-from difflib import HtmlDiff
-from tempfile import NamedTemporaryFile
-
-
-def PromptUserToAcceptDiff(old_text, new_text, prompt):
-  """Displays a difference in two strings (old and new file contents) to the
-  user and asks whether the new version is acceptable.
-
-  Args:
-    old_text: A string containing old file contents.
-    new_text: A string containing new file contents.
-    prompt: Text that should be displayed to the user, asking whether the new
-            file contents should be accepted.
-
-  Returns:
-    True is user accepted the changes or there were no changes, False otherwise.
-  """
-  logging.info('Computing diff...')
-  if old_text == new_text:
-    logging.info('No changes detected')
-    return True
-  html_diff = HtmlDiff(wrapcolumn=80).make_file(
-      old_text.splitlines(), new_text.splitlines(), fromdesc='Original',
-      todesc='Updated', context=True, numlines=5)
-  temp = NamedTemporaryFile(suffix='.html', delete=False)
-  try:
-    temp.write(html_diff)
-    temp.close()  # Close the file so the browser process can access it.
-    webbrowser.open('file://' + temp.name)
-    print prompt
-    response = raw_input('(Y/n): ').strip().lower()
-  finally:
-    temp.close()  # May be called on already closed file.
-    os.remove(temp.name)
-  return response == 'y' or response == ''