"""
Entry point for rainbow parenthesis.

Reads a string from stdin, and outputs it to stdout with all
parenthesis prettily colored.
"""

from . import colorize, Colored, __version__
from . import term
import argparse


def build_argparse() -> argparse.ArgumentParser:
    """
    Construct the argument parser for ``rainbow`` .

    This is mostly a separate procedure to allow direct generation of
    man pages.
    """
    parser = argparse.ArgumentParser(prog='rainbow')
    parser.add_argument('input', type=argparse.FileType('r'),
                        nargs='?', default='-')
    parser.add_argument('--version',
                        action='version',
                        version=f'%(prog)s {__version__}')
    return parser


def main():
    """Interactive entry point for the program."""
    parser = build_argparse()
    args = parser.parse_args()

    for item in colorize(args.input):
        match item:
            case Colored():
                print(term.colorize(item), end='')
            case s:
                print(s, end='')


if __name__ == '__main__':
    main()