35 lines
1.5 KiB
Python
35 lines
1.5 KiB
Python
"""Utility functions."""
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from argparse import ArgumentParser
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from typing import List
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from piggybank import __version__, __copyright__, __license__
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from piggybank.currencies import CURRENCIES, DEFAULT_CURRENCY
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__all__ = ["add_common_arguments_to_parser", "complement_array_of_coins"]
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def add_common_arguments_to_parser(parser: ArgumentParser,
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include_reverse_flag: bool = True) -> None:
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"""Extends ArgumentParser with a common set of arguments that are shared
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amongst all parsers in CLI module."""
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parser.add_argument("-v", "--version", action="store_true",
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help="show program's version and license and exit")
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parser.add_argument("--list-currencies", action="store_true",
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help="list all supported currencies and exit")
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if include_reverse_flag:
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parser.add_argument("-r", "--reverse", action="store_true",
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help="reverse a set of coins so incomplete set"
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"fills with zeros from right. E.g. '8 9' will be"
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"interpreted as '8 9 0 0 0 0' instead of"
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"'0 0 0 0 8 9'")
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def complement_array_of_coins(coins: List[int], currency: str,
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_reversed: bool = False) -> List[int]:
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"""Complements array of coins up to the count of currency's coins."""
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offset_array = [0] * (CURRENCIES[currency]["count"] - len(coins))
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return offset_array + coins if not _reversed else coins + offset_array
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