| #!/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 |
| |
| """ |
| |
| 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 |
| else: |
| break |
| 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 |
| filename.endswith(".h")): |
| return |
| |
| offset, length = getOffsetLength(filename, line_number, line_count) |
| with open(filename, 'r') as f: |
| text = f.read() |
| command = [binary, '-offset', str(offset), '-length', str(length)] |
| if style: |
| command.extend(['-style', style]) |
| p = subprocess.Popen(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE, |
| stdin=subprocess.PIPE) |
| stdout, stderr = p.communicate(input=text) |
| if stderr: |
| print stderr |
| return |
| if not stdout: |
| print 'Segfault occurred while formatting', filename |
| print 'Please report a bug on llvm.org/bugs.' |
| return |
| with open(filename, 'w') as f: |
| f.write(stdout) |
| |
| |
| def main(): |
| parser = argparse.ArgumentParser(description= |
| 'Reformat changed lines in 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)') |
| args = parser.parse_args() |
| |
| filename = None |
| ranges = [] |
| |
| for line in sys.stdin: |
| match = re.search('^\+\+\+\ (.*?/){%s}(\S*)' % args.p, line) |
| if match: |
| filename = match.group(2) |
| if filename == None: |
| continue |
| |
| match = re.search('^@@.*\+(\d+)(,(\d+))?', line) |
| if match: |
| line_count = 1 |
| if match.group(3): |
| line_count = int(match.group(3)) |
| ranges.append((filename, int(match.group(1)), line_count)) |
| |
| # Reverse the ranges so that the reformatting does not influence file offsets. |
| for r in reversed(ranges): |
| # Do the actual formatting. |
| formatRange(r, args.style) |
| |
| |
| if __name__ == '__main__': |
| main() |