import sys
import logging

def get_string_arg(args, required):
    """
    Take an array of element, take first element and return it stripped.
    If array is empty or None, print an error message with required and exit
    in error.

    :param args: an array of arguments. Can be empty or None
    :param required: the message to print in no args (or None)
    :return: The arg stripped
    """
    if not args:
        print(f'Missing {required}')
        sys.exit(1)

    logging.debug(args)
    return args[0].strip()

# TODO Move this function
def arg_string(arg, required = ''):
    # TODO To meld with get_string_args
    if required and arg.startswith('-'):
        print('required ', required)
        sys.exit('1')
    else:
        return arg.strip()

def arg_number(arg, required = ''):
    if not arg.isdigit():
        print('Invalid value') # TODO
        sys.exit(1)

    return int(arg)