Add CheckChangeHasNoStrayWhitespace().

presubmit_canned_checks.py

 #!/usr/bin/env python
 # Copyright (c) 2006-2009 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.
 
 """Generic presubmit checks that can be reused by other presubmit checks."""
 
 
 ### Description checks
 
@@ skipping 126 matching lines @@
   tabs = []
   for f, line_num, line in input_api.RightHandSideLines(source_file_filter):
     if '\t' in line:
       tabs.append("%s, line %s" % (f.LocalPath(), line_num))
   if tabs:
     return [output_api.PresubmitPromptWarning("Found a tab character in:",
                                               long_text="\n".join(tabs))]
   return []
 
 
+def CheckChangeHasNoStrayWhitespace(input_api, output_api,
+                                    source_file_filter=None):
+  """Checks that there is no stray whitespace at source lines end."""
+  errors = []
+  for f, line_num, line in input_api.RightHandSideLines(source_file_filter):
+    if line.rstrip() != line:
+      errors.append("%s, line %s" % (f.LocalPath(), line_num))
+  if errors:
+    return [output_api.PresubmitPromptWarning(
+        "Found line ending with white spaces in:",
+        long_text="\n".join(errors))]
+  return []
+
+
 def CheckLongLines(input_api, output_api, maxlen=80, source_file_filter=None):
   """Checks that there aren't any lines longer than maxlen characters in any of
   the text files to be submitted.
   """
   bad = []
   for f, line_num, line in input_api.RightHandSideLines(source_file_filter):
     # Allow lines with http://, https:// and #define/#pragma/#include/#if/#endif
     # to exceed the maxlen rule.
     if (len(line) > maxlen and
         not 'http://' in line and
@@ skipping 81 matching lines @@
                                   long_text=input_api.traceback.format_exc()))
 
   buffer = input_api.cStringIO.StringIO()
   results = input_api.unittest.TextTestRunner(stream=buffer, verbosity=0).run(
       input_api.unittest.TestSuite(tests_suite))
   if not results.wasSuccessful():
     outputs.append(message_type("%d unit tests failed." %
                                 (len(results.failures) + len(results.errors)),
                                 long_text=buffer.getvalue()))
   return outputs