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# 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 == ''
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