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+#!/usr/bin/env 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/svn users:
+
+ git diff -U0 HEAD^ | clang-format-diff.py -p1 -i
+ svn diff --diff-cmd=diff -x-U0 | clang-format-diff.py -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', metavar='NUM', default=0,
+ help='strip the smallest prefix containing P slashes')
+ parser.add_argument('-regex', metavar='PATTERN', default=None,
+ help='custom pattern selecting file paths to reformat '
+ '(case sensitive, overrides -iregex)')
+ parser.add_argument('-iregex', metavar='PATTERN', default=
+ r'.*\.(cpp|cc|c\+\+|cxx|c|cl|h|hpp|m|mm|inc|js|ts|proto'
+ r'|protodevel|java)',
+ help='custom pattern selecting file paths to reformat '
+ '(case insensitive, overridden by -regex)')
+ parser.add_argument('-sort-includes', action='store_true', default=False,
+ help='let clang-format sort include blocks')
+ parser.add_argument('-v', '--verbose', action='store_true',
+ help='be more verbose, ineffective without -i')
+ 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
+
+ if args.regex is not None:
+ if not re.match('^%s$' % args.regex, filename):
+ continue
+ else:
+ if not re.match('^%s$' % args.iregex, filename, re.IGNORECASE):
+ 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():
+ if args.i and args.verbose:
+ print 'Formatting', filename
+ command = [binary, filename]
+ if args.i:
+ command.append('-i')
+ if args.sort_includes:
+ command.append('-sort-includes')
+ command.extend(lines)
+ if args.style:
+ command.extend(['-style', args.style])
+ p = subprocess.Popen(command, stdout=subprocess.PIPE,
+ stderr=None, stdin=subprocess.PIPE)
+ stdout, stderr = p.communicate()
+ 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:
+ sys.stdout.write(diff_string)
+
+if __name__ == '__main__':
+ main()