1# Copyright (c) 2010 Google Inc. All rights reserved.
2#
3# Redistribution and use in source and binary forms, with or without
4# modification, are permitted provided that the following conditions are
5# met:
6#
7#     * Redistributions of source code must retain the above copyright
8# notice, this list of conditions and the following disclaimer.
9#     * Redistributions in binary form must reproduce the above
10# copyright notice, this list of conditions and the following disclaimer
11# in the documentation and/or other materials provided with the
12# distribution.
13#     * Neither the name of Google Inc. nor the names of its
14# contributors may be used to endorse or promote products derived from
15# this software without specific prior written permission.
16#
17# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
19# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
20# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
21# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
22# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
23# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28
29import os
30import tempfile
31
32
33class PrettyPatch(object):
34    def __init__(self, executive):
35        self._executive = executive
36
37    def pretty_diff_file(self, diff):
38        # Diffs can contain multiple text files of different encodings
39        # so we always deal with them as byte arrays, not unicode strings.
40        assert(isinstance(diff, str))
41        pretty_diff = self.pretty_diff(diff)
42        diff_file = tempfile.NamedTemporaryFile(suffix=".html")
43        diff_file.write(pretty_diff)
44        diff_file.flush()
45        return diff_file
46
47    def pretty_diff(self, diff):
48        # pretify.rb will hang forever if given no input.
49        # Avoid the hang by returning an empty string.
50        if not diff:
51            return ""
52
53        pretty_patch_path = os.path.join(os.path.dirname(__file__), '..', '..',
54                                         'webkitruby', 'PrettyPatch')
55        prettify_path = os.path.join(pretty_patch_path, "prettify.rb")
56        args = [
57            "ruby",
58            "-I",
59            pretty_patch_path,
60            prettify_path,
61        ]
62        # PrettyPatch does not modify the encoding of the diff output
63        # so we can't expect it to be utf-8.
64        return self._executive.run_command(args, input=diff, decode_output=False)
65