def parse_command_line(
argv: List[str]) -> Tuple[Namespace, DarkerConfig, DarkerConfig]:
"""Return the parsed command line, using defaults from a configuration file
Also return the effective configuration which combines defaults, the configuration
read from ``pyproject.toml`` (or the path given in ``--config``), and command line
arguments.
Finally, also return the set of configuration options which differ from defaults.
"""
# 1. Parse the paths of files/directories to process into `args.src`.
parser_for_srcs = make_argument_parser(require_src=False)
args = parser_for_srcs.parse_args(argv)
# 2. Locate `pyproject.toml` based on those paths, or in the current directory if no
# paths were given. Load Darker configuration from it.
config = load_config(args.src)
# 3. Use configuration as defaults for re-parsing command line arguments, and don't
# require file/directory paths if they are specified in configuration.
parser = make_argument_parser(require_src=not config.get("src"))
parser.set_defaults(**config)
args = parser.parse_args(argv)
# 4. Also create a parser which uses the original default configuration values.
# This is used to find out differences between the effective configuration and
# default configuration values, and print them out in verbose mode.
parser_with_original_defaults = make_argument_parser(require_src=True)
return (
args,
get_effective_config(args),
get_modified_config(parser_with_original_defaults, args),
)
def test_get_modified_config(args, expect):
parser = ArgumentParser()
parser.add_argument("names", nargs="*", default=["foo"])
parser.add_argument("--int", dest="int", default=42)
parser.add_argument("--string", default="fourty-two")
result = get_modified_config(parser, args)
assert result == expect