blob: 68b5113d92f6e03773cae8f5e35510a257dcc2b0 [file] [log] [blame]
#===- - 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.
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^ | -p1
import argparse
import re
import subprocess
import sys
# Change this to the full path if clang-format is not on the path.
binary = 'clang-format'
def getOffsetLength(filename, line_number, line_count):
Calculates the field offset and length based on line number and count.
offset = 0
length = 0
with open(filename, 'r') as f:
for line in f:
if line_number > 1:
offset += len(line)
line_number -= 1
elif line_count > 0:
length += len(line)
line_count -= 1
return offset, length
def formatRange(r, style):
Formats range 'r' according to style 'style'.
filename, line_number, line_count = r
# FIXME: Add other types containing C++/ObjC code.
if not (filename.endswith(".cpp") or filename.endswith(".cc") or
offset, length = getOffsetLength(filename, line_number, line_count)
with open(filename, 'r') as f:
text =
command = [binary, '-offset', str(offset), '-length', str(length)]
if style:
command.extend(['-style', style])
p = subprocess.Popen(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE,
stdout, stderr = p.communicate(input=text)
if stderr:
print stderr
if not stdout:
print 'Segfault occurred while formatting', filename
print 'Please report a bug on'
with open(filename, 'w') as f:
def main():
parser = argparse.ArgumentParser(description=
'Reformat changed lines in diff')
parser.add_argument('-p', default=1,
help='strip the smallest prefix containing P slashes')
help='formatting style to apply (LLVM, Google, Chromium)')
args = parser.parse_args()
filename = None
ranges = []
for line in sys.stdin:
match ='^\+\+\+\ (.*?/){%s}(\S*)' % args.p, line)
if match:
filename =
if filename == None:
match ='^@@.*\+(\d+)(,(\d+))?', line)
if match:
line_count = 1
line_count = int(
ranges.append((filename, int(, line_count))
# Reverse the ranges so that the reformatting does not influence file offsets.
for r in reversed(ranges):
# Do the actual formatting.
if __name__ == '__main__':