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#!/usr/bin/python
#
#===- clang-format-diff.py - ClangFormat Diff Reformatter ----*- python -*--===#
#
# The LLVM Compiler Infrastructure
#
# This file is distributed under the University of Illinois Open Source
# License. See LICENSE.TXT for details.
#
#===------------------------------------------------------------------------===#
r"""
ClangFormat Diff Reformatter
============================
This script reads input from a unified diff and reformats all the changed
lines. This is useful to reformat all the lines touched by a specific patch.
Example usage for git users:
git diff -U0 HEAD^ | clang-format-diff.py -p1 -i
"""
import argparse
import difflib
import re
import string
import subprocess
import StringIO
import sys
# Change this to the full path if clang-format is not on the path.
binary = 'clang-format'
def main():
parser = argparse.ArgumentParser(description=
'Reformat changed lines in diff. Without -i '
'option just output the diff that would be'
'introduced.')
parser.add_argument('-i', action='store_true', default=False,
help='apply edits to files instead of displaying a diff')
parser.add_argument('-p', default=0,
help='strip the smallest prefix containing P slashes')
parser.add_argument(
'-style',
help=
'formatting style to apply (LLVM, Google, Chromium, Mozilla, WebKit)')
args = parser.parse_args()
# Extract changed lines for each file.
filename = None
lines_by_file = {}
for line in sys.stdin:
match = re.search('^\+\+\+\ (.*?/){%s}(\S*)' % args.p, line)
if match:
filename = match.group(2)
if filename == None:
continue
# FIXME: Add other types containing C++/ObjC code.
if not (filename.endswith(".cpp") or filename.endswith(".cc") or
filename.endswith(".h")):
continue
match = re.search('^@@.*\+(\d+)(,(\d+))?', line)
if match:
start_line = int(match.group(1))
line_count = 1
if match.group(3):
line_count = int(match.group(3))
if line_count == 0:
continue
end_line = start_line + line_count - 1;
lines_by_file.setdefault(filename, []).extend(
['-lines', str(start_line) + ':' + str(end_line)])
# Reformat files containing changes in place.
for filename, lines in lines_by_file.iteritems():
command = [binary, filename]
if args.i:
command.append('-i')
command.extend(lines)
if args.style:
command.extend(['-style', args.style])
p = subprocess.Popen(command, stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
stdin=subprocess.PIPE)
stdout, stderr = p.communicate()
if stderr:
print stderr
if p.returncode != 0:
sys.exit(p.returncode);
if not args.i:
with open(filename) as f:
code = f.readlines()
formatted_code = StringIO.StringIO(stdout).readlines()
diff = difflib.unified_diff(code, formatted_code,
filename, filename,
'(before formatting)', '(after formatting)')
diff_string = string.join(diff, '')
if len(diff_string) > 0:
print diff_string
if __name__ == '__main__':
main()
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