cli.py

import argparse
import os
import sys

from configparser import ConfigParser


def _validate_file(path: str):
    """
    Checks whether file exists
    """
    if not os.path.exists(path):
        raise argparse.ArgumentTypeError(f"File '{path}' not found.")
    if not os.path.isfile(path):
        raise argparse.ArgumentTypeError(f"'{path}' not a file.")
    return path


def create_parser():
    """
    Creates Argument parser.
    """
    parser = argparse.ArgumentParser(description='Awesome CLI tool.')
    parser.add_argument(
        '-c',
        '--config',
        metavar='CONFIG_FILE',
        type=_validate_file,
        required=True,
        help='Configuration INI-file.'
    )
    return parser


def to_dict(config: ConfigParser):
    """
    Converts a ConfigParser structure (INI-file) into a nested dict.
    """
    return {
        section_name: dict(config[section_name])
        for section_name
        in config.sections()
    }


def parse_args(args):
    """
    Parses command line arguments.
    """
    parser = create_parser()
    parsed_args = vars(parser.parse_args(args=args))
    return parsed_args


# ------- Add other logic below --------
def foo():
    pass


def bar():
    pass


def run(arguments):
    config = ConfigParser()
    # config contains filepath to config.ini file
    config.read(arguments['config'])
    # Here we have our config as a dict
    cfg = to_dict(config)

    foo()
    bar()


def main(args=sys.argv[1:]):
    sys.exit(run(arguments=parse_args(args=args)))


if __name__ == '__main__':
    main()