Add post_processing code to update copyright year automatically.

post_processors/chromium_copyright.py

+# Copyright (c) 2011 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.
+
+from __future__ import with_statement
+import datetime
+import os
+import re
+
+
+def process(checkout, patches):
+  """Enforces current year in Chromium copyright.
+
+  Makes lawyers happy!
+  """
+  pattern = (
+    r'^(.*)Copyright \(c\) \d\d\d\d The Chromium Authors. '
+    r'All rights reserved.$')
+  replacement = (
+      r'\1Copyright (c) %s The Chromium Authors. All rights reserved.' %
+        datetime.date.today().year)
+
+  for patch in patches.patches:
+    if patch.is_delete or patch.is_binary:
+      pass
+    filepath = os.path.join(checkout.project_path, patch.filename)
+    with open(filepath, 'rb') as f:
+      lines = f.read().splitlines(True)
+    if not lines:
+      continue
+    modified = False
+    for i in xrange(min(5, len(lines))):
+      old_line = lines[i]
+      lines[i] = re.sub(pattern, replacement, lines[i])
+      if old_line != lines[i]:
+        modified = True
+        break
+    if modified:
+      with open(filepath, 'wb') as f:
+        f.write(''.join(lines))