Proof of concept fixit rewriting.

tools/clang/scripts/apply-fixits.py

Index: tools/clang/scripts/apply-fixits.py
diff --git a/tools/clang/scripts/apply-fixits.py b/tools/clang/scripts/apply-fixits.py
new file mode 100755
index 0000000000000000000000000000000000000000..0f4231f9818403d3941f341f85f10bb472c0c8b2
--- /dev/null
+++ b/tools/clang/scripts/apply-fixits.py
@@ -0,0 +1,64 @@
+#!/usr/bin/env/python
+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+
+import collections
+import fileinput
+import os
+import re
+import sys
+
+
+# fix-it:"../../base/threading/sequenced_worker_pool.h":{341:3-341:11}:""
+_FIXIT_RE = re.compile(r'^fix-it:"(?P<file>.+?)":'
+    r'{(?P<start_line>\d+?):(?P<start_col>\d+?)-'
+    r'(?P<end_line>\d+?):(?P<end_col>\d+?)}:'
+    r'"(?P<text>.*?)"$')
+
+
+FixIt = collections.namedtuple('FixIt',
+    ('start_line', 'start_col', 'end_line', 'end_col', 'text'))
+
+
+def main():
+  os.chdir('out/Debug')
+  fixits = collections.defaultdict(list)
+  for line in fileinput.input():
+    if not line.startswith('fix-it:'):
+      continue
+    m = _FIXIT_RE.match(line)
+    if not m:
+      continue
+    # The negative line numbers are a cheap hack so we can sort things in line
+    # order but reverse column order.
+    fixits[m.group('file')].append(FixIt(
+        int(m.group('start_line')),
+        -int(m.group('start_col')),
+        int(m.group('end_line')),
+        -int(m.group('end_col')),
+        m.group('text')))
+  for k, v in fixits.iteritems():
+    v.sort()
+    with open(k, 'rb+') as f:
+      lines = f.readlines()
+      last_fixit = None
+      for fixit in v:
+        if fixit.start_line != fixit.end_line:
+          print 'error: multiline fixits not supported! file: %s, fixit: %s' % (
+              k, fixit)
+          sys.exit(1)
+        if fixit == last_fixit:
+          continue
+        last_fixit = fixit
+        # Zero-based indexing is the one true way!
+        line = lines[fixit.start_line - 1]
+        lines[fixit.start_line - 1] = line[:-fixit.start_col - 1] + fixit.text + line[-fixit.end_col - 1:]
+      f.seek(0)
+      f.truncate()
+      f.writelines(lines)
+
+
+if __name__ == '__main__':
+  sys.exit(main())