udiffer.py revision 355604 
1#! /usr/bin/env python3
2#                          __  __            _
3#                       ___\ \/ /_ __   __ _| |_
4#                      / _ \\  /| '_ \ / _` | __|
5#                     |  __//  \| |_) | (_| | |_
6#                      \___/_/\_\ .__/ \__,_|\__|
7#                               |_| XML parser
8#
9# Copyright (c) 2017 Expat development team
10# Licensed under the MIT license:
11#
12# Permission is  hereby granted,  free of charge,  to any  person obtaining
13# a  copy  of  this  software   and  associated  documentation  files  (the
14# "Software"),  to  deal in  the  Software  without restriction,  including
15# without  limitation the  rights  to use,  copy,  modify, merge,  publish,
16# distribute, sublicense, and/or sell copies of the Software, and to permit
17# persons  to whom  the Software  is  furnished to  do so,  subject to  the
18# following conditions:
19#
20# The above copyright  notice and this permission notice  shall be included
21# in all copies or substantial portions of the Software.
22#
23# THE  SOFTWARE  IS  PROVIDED  "AS  IS",  WITHOUT  WARRANTY  OF  ANY  KIND,
24# EXPRESS  OR IMPLIED,  INCLUDING  BUT  NOT LIMITED  TO  THE WARRANTIES  OF
25# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
26# NO EVENT SHALL THE AUTHORS OR  COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
27# DAMAGES OR  OTHER LIABILITY, WHETHER  IN AN  ACTION OF CONTRACT,  TORT OR
28# OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
29# USE OR OTHER DEALINGS IN THE SOFTWARE.
30
31import argparse
32import difflib
33import sys
34
35
36def _read_lines(filename):
37    try:
38        with open(filename) as f:
39            return f.readlines()
40    except UnicodeDecodeError:
41        with open(filename, encoding='utf_16') as f:
42            return f.readlines()
43
44
45def main():
46    parser = argparse.ArgumentParser()
47    parser.add_argument('first', metavar='FILE')
48    parser.add_argument('second', metavar='FILE')
49    config = parser.parse_args()
50
51    first = _read_lines(config.first)
52    second = _read_lines(config.second)
53
54    diffs = list(difflib.unified_diff(first, second, fromfile=config.first,
55                                      tofile=config.second))
56    if diffs:
57        sys.stdout.writelines(diffs)
58        sys.exit(1)
59
60
61if __name__ == '__main__':
62    main()
63