code: def _get_dir(toml_config_setting, sawtooth_home_dir, windows_dir, default_dir):
      
      conf_file = os.path.join(_get_config_dir(), 'path.toml')
      if os.path.exists(conf_file):
          with open(conf_file) as fd:
              raw_config = fd.read()
          toml_config = toml.loads(raw_config)
          if toml_config_setting in toml_config:
              return toml_config[toml_config_setting]
  
      if 'SAWTOOTH_HOME' in os.environ:
          return os.path.join(os.environ['SAWTOOTH_HOME'], sawtooth_home_dir)
  
      if os.name == 'nt':
          base_dir = \
              os.path.dirname(os.path.dirname(os.path.abspath(sys.argv[0])))
          return os.path.join(base_dir, windows_dir)
  
      return default_dir
docs: Determines the directory path based on configuration.
  
      Arguments:
          toml_config_setting (str): The name of the config setting related
              to the directory which will appear in path.toml.
          sawtooth_home_dir (str): The directory under the SAWTOOTH_HOME
              environment variable.  For example, for 'data' if the data
              directory is $SAWTOOTH_HOME/data.
          windows_dir (str): The windows path relative to the computed base
              directory.
          default_dir (str): The default path on Linux.
  
      Returns:
          directory (str): The path.