docs: def walk_files(args, root, directory, action):
      """
      Recusively go do the subdirectories of the directory,
      calling the action on each file
  
      """
      for entry in os.listdir(directory):
          if is_hidden(args, entry):
              continue
          if is_excluded_directory(args, entry):
              continue
          if is_in_default_excludes(entry):
              continue
          if not is_included(args, entry):
              continue
          if is_excluded(args, entry, directory):
              continue
          entry = os.path.join(directory, entry)
          if os.path.isdir(entry):
              walk_files(args, root, entry, action)
          if os.path.isfile(entry):
              if is_binary(entry):
                  continue
              action(entry)