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Side by Side Diff: third_party/clang_format/scripts/clang-format-diff.py

Issue 135773003: Revert of Revert of Add clang-format binaries and scripts for all platforms (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: Created 6 years, 11 months ago
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1 #!/usr/bin/python
2 #
3 #===- clang-format-diff.py - ClangFormat Diff Reformatter ----*- python -*--===#
4 #
5 # The LLVM Compiler Infrastructure
6 #
7 # This file is distributed under the University of Illinois Open Source
8 # License. See LICENSE.TXT for details.
9 #
10 #===------------------------------------------------------------------------===#
11
12 r"""
13 ClangFormat Diff Reformatter
14 ============================
15
16 This script reads input from a unified diff and reformats all the changed
17 lines. This is useful to reformat all the lines touched by a specific patch.
18 Example usage for git users:
19
20 git diff -U0 HEAD^ | clang-format-diff.py -p1 -i
21
22 """
23
24 import argparse
25 import difflib
26 import re
27 import string
28 import subprocess
29 import StringIO
30 import sys
31
32
33 # Change this to the full path if clang-format is not on the path.
34 binary = 'clang-format'
35
36
37 def main():
38 parser = argparse.ArgumentParser(description=
39 'Reformat changed lines in diff. Without -i '
40 'option just output the diff that would be '
41 'introduced.')
42 parser.add_argument('-i', action='store_true', default=False,
43 help='apply edits to files instead of displaying a diff')
44 parser.add_argument('-p', metavar='NUM', default=0,
45 help='strip the smallest prefix containing P slashes')
46 parser.add_argument('-regex', metavar='PATTERN', default=None,
47 help='custom pattern selecting file paths to reformat '
48 '(case sensitive, overrides -iregex)')
49 parser.add_argument('-iregex', metavar='PATTERN', default=
50 r'.*\.(cpp|cc|c\+\+|cxx|c|cl|h|hpp|m|mm|inc|js)',
51 help='custom pattern selecting file paths to reformat '
52 '(case insensitive, overridden by -regex)')
53 parser.add_argument(
54 '-style',
55 help=
56 'formatting style to apply (LLVM, Google, Chromium, Mozilla, WebKit)')
57 args = parser.parse_args()
58
59 # Extract changed lines for each file.
60 filename = None
61 lines_by_file = {}
62 for line in sys.stdin:
63 match = re.search('^\+\+\+\ (.*?/){%s}(\S*)' % args.p, line)
64 if match:
65 filename = match.group(2)
66 if filename == None:
67 continue
68
69 if args.regex is not None:
70 if not re.match('^%s$' % args.regex, filename):
71 continue
72 else:
73 if not re.match('^%s$' % args.iregex, filename, re.IGNORECASE):
74 continue
75
76 match = re.search('^@@.*\+(\d+)(,(\d+))?', line)
77 if match:
78 start_line = int(match.group(1))
79 line_count = 1
80 if match.group(3):
81 line_count = int(match.group(3))
82 if line_count == 0:
83 continue
84 end_line = start_line + line_count - 1;
85 lines_by_file.setdefault(filename, []).extend(
86 ['-lines', str(start_line) + ':' + str(end_line)])
87
88 # Reformat files containing changes in place.
89 for filename, lines in lines_by_file.iteritems():
90 command = [binary, filename]
91 if args.i:
92 command.append('-i')
93 command.extend(lines)
94 if args.style:
95 command.extend(['-style', args.style])
96 p = subprocess.Popen(command, stdout=subprocess.PIPE,
97 stderr=None, stdin=subprocess.PIPE)
98 stdout, stderr = p.communicate()
99 if p.returncode != 0:
100 sys.exit(p.returncode);
101
102 if not args.i:
103 with open(filename) as f:
104 code = f.readlines()
105 formatted_code = StringIO.StringIO(stdout).readlines()
106 diff = difflib.unified_diff(code, formatted_code,
107 filename, filename,
108 '(before formatting)', '(after formatting)')
109 diff_string = string.join(diff, '')
110 if len(diff_string) > 0:
111 sys.stdout.write(diff_string)
112
113 if __name__ == '__main__':
114 main()
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