text: #!/usr/bin/env python3
  # 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 argparse
  import multiprocessing
  import os
  import subprocess
  import sys
  
  sys.path.append(
      os.path.join(os.path.dirname(sys.argv[0]), '..', 'run_tests',
                   'python_utils'))
  import jobset
  
  clang_tidy = os.environ.get('CLANG_TIDY', 'clang-tidy')
  
  argp = argparse.ArgumentParser(description='Run clang-tidy against core')
  argp.add_argument('files', nargs='+', help='Files to tidy')
  argp.add_argument('--fix', dest='fix', action='store_true')
  argp.add_argument('-j',
                    '--jobs',
                    type=int,
                    default=multiprocessing.cpu_count(),
                    help='Number of CPUs to use')
  argp.add_argument('--only-changed', dest='only_changed', action='store_true')
  argp.set_defaults(fix=False, only_changed=False)
  args = argp.parse_args()
  
  # Explicitly passing the .clang-tidy config by reading it.
  # This is required because source files in the compilation database are
  # in a different source tree so clang-tidy cannot find the right config file
  # by seeking their parent directories.
  with open(".clang-tidy") as f:
      config = f.read()
  cmdline = [
      clang_tidy,
      '--config=' + config,
  ]
  
  if args.fix:
      cmdline.append('--fix-errors')
  
  if args.only_changed:
      orig_files = set(args.files)
      actual_files = []
      output = subprocess.check_output(
          ['git', 'diff', 'origin/master', 'HEAD', '--name-only'])
      for line in output.decode('ascii').splitlines(False):
          if line in orig_files:
              print("check: %s" % line)
              actual_files.append(line)
          else:
              print("skip: %s - not in the build" % line)
      args.files = actual_files
  
  jobs = []
  for filename in args.files:
      jobs.append(
          jobset.JobSpec(
              cmdline + [filename],
              shortname=filename,
              timeout_seconds=15 * 60,
          ))
  
  num_fails, res_set = jobset.run(jobs, maxjobs=args.jobs, quiet_success=True)
  sys.exit(num_fails)
  