--- /dev/null
+#!/usr/bin/python
+#
+#===- clang-tidy-diff.py - ClangTidy Diff Checker ------------*- python -*--===#
+#
+# The LLVM Compiler Infrastructure
+#
+# This file is distributed under the University of Illinois Open Source
+# License. See LICENSE.TXT for details.
+#
+#===------------------------------------------------------------------------===#
+
+r"""
+ClangTidy Diff Checker
+======================
+
+This script reads input from a unified diff, runs clang-tidy on all changed
+files and outputs clang-tidy warnings in changed lines only. This is useful to
+detect clang-tidy regressions in the lines touched by a specific patch.
+Example usage for git/svn users:
+
+ git diff -U0 HEAD^ | clang-tidy-diff.py -p1
+ svn diff --diff-cmd=diff -x-U0 | \
+ clang-tidy-diff.py -fix -checks=-*,misc-use-override
+
+"""
+
+import argparse
+import json
+import re
+import subprocess
+import sys
+
+
+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('-clang-tidy-binary', metavar='PATH',
+ default='clang-tidy',
+ help='path to clang-tidy binary')
+ 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)',
+ help='custom pattern selecting file paths to reformat '
+ '(case insensitive, overridden by -regex)')
+
+ parser.add_argument('-fix', action='store_true', default=False,
+ help='apply suggested fixes')
+ parser.add_argument('-checks',
+ help='checks filter, when not specified, use clang-tidy '
+ 'default',
+ default='')
+ clang_tidy_args = []
+ argv = sys.argv[1:]
+ if '--' in argv:
+ clang_tidy_args.extend(argv[argv.index('--'):])
+ argv = argv[:argv.index('--')]
+
+ args = parser.parse_args(argv)
+
+ # 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, []).append([start_line, end_line])
+
+ if len(lines_by_file) == 0:
+ print "No relevant changes found."
+ sys.exit(0)
+
+ line_filter_json = json.dumps(
+ [{"name" : name, "lines" : lines_by_file[name]} for name in lines_by_file],
+ separators = (',', ':'))
+
+ # Run clang-tidy on files containing changes.
+ command = [args.clang_tidy_binary]
+ command.append('-line-filter=\'' + line_filter_json + '\'')
+ if args.fix:
+ command.append('-fix')
+ if args.checks != '':
+ command.append('-checks=\'' + args.checks + '\'')
+ command.extend(lines_by_file.keys())
+ command.extend(clang_tidy_args)
+
+ sys.exit(subprocess.call(' '.join(command), shell=True))
+
+if __name__ == '__main__':
+ main()