Let ChangeLog get auto-generated in push-to-trunk script.

tools/push-to-trunk/common_includes.py

 #!/usr/bin/env python
 # Copyright 2013 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
@@ skipping 63 matching lines @@
 
 
 def GetLastChangeLogEntries(change_log_file):
   result = []
   for line in LinesInFile(change_log_file):
     if re.search(r"^\d{4}-\d{2}-\d{2}:", line) and result: break
     result.append(line)
   return "".join(result)
 
 
-def MakeChangeLogBody(commit_generator):
+def MakeComment(text):
+  return MSub(r"^( ?)", "#", text)
+
+
+def StripComments(text):
+  # Use split not splitlines to keep terminal newlines.
+  return "\n".join(filter(lambda x: not x.startswith("#"), text.split("\n")))
+
+
+def MakeChangeLogBody(commit_messages, auto_format=False):
   result = ""
-  for (title, body, author) in commit_generator():
+  added_titles = set()
+  for (title, body, author) in commit_messages:
+    # TODO(machenbach): Reload the commit description from rietveld in order to
+    # catch late changes.
+    title = title.rstrip()
+    if auto_format:
+      # Only add commits that set the LOG flag correctly.
+      log_exp = r"^[ \t]*LOG[ \t]*=[ \t]*(?:Y(?:ES)?)|TRUE"
+      if not re.search(log_exp, body, flags=re.I | re.M):
+        continue
+      # Never include reverts.
+      if title.startswith("Revert "):
+        continue
+      # Don't include duplicates.
+      if title in added_titles:
+        continue
+
+    # TODO(machenbach): Let python do all formatting. Get raw git title, attach
+    # issue and add/move dot to the end - all in one line. Make formatting and
+    # indentation afterwards.
+
     # Add the commit's title line.
-    result += "%s\n" % title.rstrip()
+    result += "%s\n" % title
+    added_titles.add(title)
 
     # Add bug references.
     result += MakeChangeLogBugReference(body)
 
-    # Append the commit's author for reference.
-    result += "%s\n\n" % author.rstrip()
+    # Append the commit's author for reference if not in auto-format mode.
+    if not auto_format:
+      result += "%s\n" % author.rstrip()
+
+    result += "\n"
   return result
 
 
 def MakeChangeLogBugReference(body):
   """Grep for "BUG=xxxx" lines in the commit message and convert them to
   "(issue xxxx)".
   """
   crbugs = []
   v8bugs = []
 
@@ skipping 294 matching lines @@
     step.SetNumber(number)
     step.SetConfig(config)
     step.SetOptions(options)
     step.SetState(state)
     step.SetSideEffectHandler(side_effect_handler)
     steps.append(step)
     number += 1
 
   for step in steps[options.s:]:
     step.Run()