48 lines
1.6 KiB
Python
48 lines
1.6 KiB
Python
# Copyright 2013 The Chromium Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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"""Utility functions for prompting user if changes automatically applied to some
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user-managed files are correct.
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"""
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import logging
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import os
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import webbrowser
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from difflib import HtmlDiff
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from tempfile import NamedTemporaryFile
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def PromptUserToAcceptDiff(old_text, new_text, prompt):
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"""Displays a difference in two strings (old and new file contents) to the
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user and asks whether the new version is acceptable.
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Args:
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old_text: A string containing old file contents.
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new_text: A string containing new file contents.
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prompt: Text that should be displayed to the user, asking whether the new
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file contents should be accepted.
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Returns:
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True is user accepted the changes or there were no changes, False otherwise.
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"""
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logging.info('Computing diff...')
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if old_text == new_text:
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logging.info('No changes detected')
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return True
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html_diff = HtmlDiff(wrapcolumn=80).make_file(
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old_text.splitlines(), new_text.splitlines(), fromdesc='Original',
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todesc='Updated', context=True, numlines=5)
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temp = NamedTemporaryFile(suffix='.html', delete=False)
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try:
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temp.write(html_diff)
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temp.close() # Close the file so the browser process can access it.
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webbrowser.open('file://' + temp.name)
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print prompt
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response = raw_input('(Y/n): ').strip().lower()
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finally:
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temp.close() # May be called on already closed file.
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os.remove(temp.name)
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return response == 'y' or response == ''
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