Add a presubmit check to prevent committing .rej/.orig patch files

PRESUBMIT.py

Index: PRESUBMIT.py
diff --git a/PRESUBMIT.py b/PRESUBMIT.py
index 3b8669ad4b8f6d87f21720d66477f613c14f0b0a..dec08f7b1171e78863d7b6ac0a57d004bd5e2a59 100644
--- a/PRESUBMIT.py
+++ b/PRESUBMIT.py
@@ -689,6 +689,7 @@ def _CommonChecks(input_api, output_api):
   results.extend(_CheckNoAuraWindowPropertyHInHeaders(input_api, output_api))
   results.extend(_CheckIncludeOrder(input_api, output_api))
   results.extend(_CheckForVersionControlConflicts(input_api, output_api))
+  results.extend(_CheckPatchFiles(input_api, output_api))
 
   if any('PRESUBMIT.py' == f.LocalPath() for f in input_api.AffectedFiles()):
     results.extend(input_api.canned_checks.RunUnitTestsInDirectory(
@@ -772,6 +773,17 @@ def _CheckAuthorizedAuthor(input_api, output_api):
   return []
 
 
+def _CheckPatchFiles(input_api, output_api):
+  if_patch_file = input_api.re.compile(r'.*\.(rej|orig)$')
+  problems = [f.LocalPath() for f in input_api.AffectedFiles() if
+              if_patch_file.match(f.LocalPath())]

[M-A Ruel, 2012/12/05 19:30:17]

if f.LocalPath().endswith(('.orig', '.rej'))
is cleaned to me.
Also align at +4.

+  if problems:
+    return [output_api.PresubmitError(
+        "Don't commit .rej and .orig files.", problems)]
+  else:
+    return []
+
+
 def CheckChangeOnUpload(input_api, output_api):
   results = []
   results.extend(_CommonChecks(input_api, output_api))