old_contents: # Copyright 2019 The Meson development team
  
  # 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 pathlib
  import subprocess
  from concurrent.futures import ThreadPoolExecutor
  
  from ..compilers import lang_suffixes
  
  def clangformat(srcdir_name, builddir_name):
      srcdir = pathlib.Path(srcdir_name)
      suffixes = set(lang_suffixes['c']).union(set(lang_suffixes['cpp']))
      suffixes.add('h')
      futures = []
      with ThreadPoolExecutor() as e:
          for f in (x for suff in suffixes for x in srcdir.glob('**/*.' + suff)):
              strf = str(f)
              if strf.startswith(builddir_name):
                  continue
              futures.append(e.submit(subprocess.check_call, ['clang-tidy', '-p', builddir_name, strf]))
          [x.result() for x in futures]
      return 0
  
  def run(args):
      srcdir_name = args[0]
      builddir_name = args[1]
      return clangformat(srcdir_name, builddir_name)
  
new_contents: # Copyright 2019 The Meson development team
  
  # 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 pathlib
  import subprocess
  import shutil
  from concurrent.futures import ThreadPoolExecutor
  
  from ..compilers import lang_suffixes
  
  def manual_clangformat(srcdir_name, builddir_name):
      srcdir = pathlib.Path(srcdir_name)
      suffixes = set(lang_suffixes['c']).union(set(lang_suffixes['cpp']))
      suffixes.add('h')
      futures = []
      returncode = 0
      with ThreadPoolExecutor() as e:
          for f in (x for suff in suffixes for x in srcdir.glob('**/*.' + suff)):
              strf = str(f)
              if strf.startswith(builddir_name):
                  continue
              futures.append(e.submit(subprocess.run, ['clang-tidy', '-p', builddir_name, strf]))
          [max(returncode, x.result().returncode) for x in futures]
      return returncode
  
  def clangformat(srcdir_name, builddir_name):
      run_clang_tidy = None
      for rct in ('run-clang-tidy', 'run-clang-tidy.py'):
          if shutil.which(rct):
              run_clang_tidy = rct
              break
      if run_clang_tidy:
          return subprocess.run([run_clang_tidy, '-p', builddir_name]).returncode
      else:
          print('Could not find run-clang-tidy, running checks manually.')
          manual_clangformat(srcdir_name, builddir_name)
  
  def run(args):
      srcdir_name = args[0]
      builddir_name = args[1]
      return clangformat(srcdir_name, builddir_name)
  
subject: Use run-clang-tidy when available.