colors.py

class Colors:
    COLOR_NAMES = [
        'black',
        'red',
        'green',
        'yellow',
        'blue',
        'purple',
        'cyan',
        'white',
    ]

    # RED, GREEN etc.
    BG_COLOR_NAMES = [c.upper() for c in COLOR_NAMES]

    def __format__(self, format_spec: str):
        if format_spec == '':
            return '\033[0m'

        options = []
        for part in format_spec.split(','):
            if part in self.COLOR_NAMES:
                options.append(f'3{self.COLOR_NAMES.index(part)}')
            elif part in self.BG_COLOR_NAMES:
                options.append(f'4{self.BG_COLOR_NAMES.index(part)}')
            elif part in 'b+':
                options.append('1')
            elif part in 'i/':
                options.append('3')
            elif part in 'u_':
                options.append('4')
            elif part.startswith('#') and len(part) == 4:
                options.append(f'38;2;{int(part[1:2] * 2, 16)};{int(part[2:3] * 2, 16)};{int(part[3:4] * 2, 16)}')
            elif part.startswith('#') and len(part) == 7:
                options.append(f'38;2;{int(part[1:3], 16)};{int(part[3:5], 16)};{int(part[5:7], 16)}')
            elif part.startswith('##') and len(part) == 5:
                options.append(f'48;2;{int(part[2:3] * 2, 16)};{int(part[3:4] * 2, 16)};{int(part[4:5] * 2, 16)}')
            elif part.startswith('##') and len(part) == 8:
                options.append(f'48;2;{int(part[2:4], 16)};{int(part[4:6], 16)};{int(part[6:8], 16)}')
            else:
                raise ValueError(f"Unknown format part: {part}")

        return f'\033[{";".join(options)}m'


def main() -> None:
    c = Colors()

    print(f"To {c:red}fight{c:}, To {c:#f00}l{c:#f40}e{c:#f80}a{c:#fc0}r{c:#fff}n{c:}, "
          f"To {c:b,u}become{c:} one with the {c:green}Matrix{c:}")


if __name__ == '__main__':
    main()