def create()

in src/python/pants/option/options_bootstrapper.py [0:0]

• 42 lines of code
• 15 McCabe index (conditional complexity)

  def create(cls, env=None, args=None):
    """Parses the minimum amount of configuration necessary to create an OptionsBootstrapper.

    :param env: An environment dictionary, or None to use `os.environ`.
    :param args: An args array, or None to use `sys.argv`.
    """
    env = {k: v for k, v in (os.environ if env is None else env).items()
           if k.startswith('PANTS_')}
    args = tuple(sys.argv if args is None else args)

    flags = set()
    short_flags = set()

    def filecontent_for(path):
      return FileContent(ensure_text(path), read_file(path, binary_mode=True))

    def capture_the_flags(*args, **kwargs):
      for arg in args:
        flags.add(arg)
        if len(arg) == 2:
          short_flags.add(arg)
        elif kwargs.get('type') == bool:
          flags.add('--no-{}'.format(arg[2:]))

    GlobalOptionsRegistrar.register_bootstrap_options(capture_the_flags)

    def is_bootstrap_option(arg):
      components = arg.split('=', 1)
      if components[0] in flags:
        return True
      for flag in short_flags:
        if arg.startswith(flag):
          return True
      return False

    # Take just the bootstrap args, so we don't choke on other global-scope args on the cmd line.
    # Stop before '--' since args after that are pass-through and may have duplicate names to our
    # bootstrap options.
    bargs = tuple(filter(is_bootstrap_option, itertools.takewhile(lambda arg: arg != '--', args)))

    config_file_paths = cls.get_config_file_paths(env=env, args=args)
    config_files_products = [filecontent_for(p) for p in config_file_paths]
    pre_bootstrap_config = Config.load_file_contents(config_files_products)

    initial_bootstrap_options = cls.parse_bootstrap_options(env, bargs, pre_bootstrap_config)
    bootstrap_option_values = initial_bootstrap_options.for_global_scope()

    # Now re-read the config, post-bootstrapping. Note the order: First whatever we bootstrapped
    # from (typically pants.ini), then config override, then rcfiles.
    full_configpaths = pre_bootstrap_config.sources()
    if bootstrap_option_values.pantsrc:
      rcfiles = [os.path.expanduser(str(rcfile)) for rcfile in bootstrap_option_values.pantsrc_files]
      existing_rcfiles = list(filter(os.path.exists, rcfiles))
      full_configpaths.extend(existing_rcfiles)

    full_config_files_products = [filecontent_for(p) for p in full_configpaths]
    post_bootstrap_config = Config.load_file_contents(
      full_config_files_products,
      seed_values=bootstrap_option_values
    )

    env_tuples = tuple(sorted(iteritems(env), key=lambda x: x[0]))
    return cls(env_tuples=env_tuples, bootstrap_args=bargs, args=args, config=post_bootstrap_config)