1#! /usr/bin/env python3
2#                          __  __            _
3#                       ___\ \/ /_ __   __ _| |_
4#                      / _ \\  /| '_ \ / _` | __|
5#                     |  __//  \| |_) | (_| | |_
6#                      \___/_/\_\ .__/ \__,_|\__|
7#                               |_| XML parser
8#
9# Copyright (c) 2017 Rhodri James <rhodri@wildebeest.org.uk>
10# Copyright (c) 2017 Sebastian Pipping <sebastian@pipping.org>
11# Licensed under the MIT license:
12#
13# Permission is  hereby granted,  free of charge,  to any  person obtaining
14# a  copy  of  this  software   and  associated  documentation  files  (the
15# "Software"),  to  deal in  the  Software  without restriction,  including
16# without  limitation the  rights  to use,  copy,  modify, merge,  publish,
17# distribute, sublicense, and/or sell copies of the Software, and to permit
18# persons  to whom  the Software  is  furnished to  do so,  subject to  the
19# following conditions:
20#
21# The above copyright  notice and this permission notice  shall be included
22# in all copies or substantial portions of the Software.
23#
24# THE  SOFTWARE  IS  PROVIDED  "AS  IS",  WITHOUT  WARRANTY  OF  ANY  KIND,
25# EXPRESS  OR IMPLIED,  INCLUDING  BUT  NOT LIMITED  TO  THE WARRANTIES  OF
26# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
27# NO EVENT SHALL THE AUTHORS OR  COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
28# DAMAGES OR  OTHER LIABILITY, WHETHER  IN AN  ACTION OF CONTRACT,  TORT OR
29# OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
30# USE OR OTHER DEALINGS IN THE SOFTWARE.
31
32import argparse
33import difflib
34import sys
35
36
37def _read_lines(filename):
38    try:
39        with open(filename) as f:
40            return f.readlines()
41    except UnicodeDecodeError:
42        with open(filename, encoding='utf_16') as f:
43            return f.readlines()
44
45
46def main():
47    parser = argparse.ArgumentParser()
48    parser.add_argument('first', metavar='FILE')
49    parser.add_argument('second', metavar='FILE')
50    config = parser.parse_args()
51
52    first = _read_lines(config.first)
53    second = _read_lines(config.second)
54
55    diffs = list(difflib.unified_diff(first, second, fromfile=config.first,
56                                      tofile=config.second))
57    if diffs:
58        sys.stdout.writelines(diffs)
59        sys.exit(1)
60
61
62if __name__ == '__main__':
63    main()
64