git hyper-blame: Added approx. line number translation.

git_common.py

 # 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.
 
 # Monkeypatch IMapIterator so that Ctrl-C can kill everything properly.
 # Derived from https://gist.github.com/aljungberg/626518
 import multiprocessing.pool
 from multiprocessing.pool import IMapIterator
 def wrapper(func):
   def wrap(self, timeout=None):
@@ skipping 356 matching lines @@
   del_config('branch.%s.%s' % (branch, option), scope=scope)
 
 
 def del_config(option, scope='local'):
   try:
     run('config', '--' + scope, '--unset', option)
   except subprocess2.CalledProcessError:
     pass
 
 
+def diff(oldrev, newrev, *args):
+  return run('diff', oldrev, newrev, *args)
+
+
 def freeze():
   took_action = False
 
   try:
     run('commit', '--no-verify', '-m', FREEZE + '.indexed')
     took_action = True
   except subprocess2.CalledProcessError:
     pass
 
   try:
@@ skipping 512 matching lines @@
                       ['HEAD'])
 
 
 def clone_file(repository, new_workdir, link, operation):
   if not os.path.exists(os.path.join(repository, link)):
     return
   link_dir = os.path.dirname(os.path.join(new_workdir, link))
   if not os.path.exists(link_dir):
     os.makedirs(link_dir)
   operation(os.path.join(repository, link), os.path.join(new_workdir, link))