text: #!/usr/bin/env python
  # Copyright 2017 gRPC authors.
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #     http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  import subprocess
  import datetime
  
  # this script is only of historical interest: it's the script that was used to
  # bootstrap the dataset
  
  
  def daterange(start, end):
      for n in range(int((end - start).days)):
          yield start + datetime.timedelta(n)
  
  
  start_date = datetime.date(2017, 3, 26)
  end_date = datetime.date(2017, 3, 29)
  
  for dt in daterange(start_date, end_date):
      dmy = dt.strftime('%Y-%m-%d')
      sha1 = subprocess.check_output(
          ['git', 'rev-list', '-n', '1', '--before=%s' % dmy, 'master']).strip()
      subprocess.check_call(['git', 'checkout', sha1])
      subprocess.check_call(['git', 'submodule', 'update'])
      subprocess.check_call(['git', 'clean', '-f', '-x', '-d'])
      subprocess.check_call([
          'cloc', '--vcs=git', '--by-file', '--yaml',
          '--out=../count/%s.yaml' % dmy, '.'
      ])
  