#!/usr/bin/env python3
"""
Leverage the python ConfigParser() class for use as a commandline INI
file reader, can be used from bash to leverage all the safety in place.

See: https://docs.python.org/2/library/configparser.html

SPDX-License-Identifier: MIT
"""

import argparse
import configparser
import signal

__version__ = "0.0.1"


def read_ini(cfgfile, section, key):
    # because we're simply printing to stdout, it really doesn't
    # matter if the file is missing, the section, the key or the
    # value - just try and get whatever is in there and print it
    # out in a very bash-esque way. Just avoid all exceptions.
    try:
        config = configparser.ConfigParser()
        config.read(cfgfile)
        if config.has_option(section, key):
            return config.get(section, key)
    except:
        pass

    # any error is just an empty string return
    return ""


def parse_args():
    """Argument parsing routine"""
    parser = argparse.ArgumentParser(description="ConfigCli")
    parser.add_argument(
        "--version", action="version", version=__version__, help="Display the version"
    )
    parser.add_argument(
        "-f", "--file", required=True, dest="cfgfile", help="Config file to read"
    )
    parser.add_argument(
        "-s", "--section", required=True, dest="section", help="Section to read"
    )
    parser.add_argument("-k", "--key", required=True, dest="key", help="Key to read")
    return parser.parse_args()


def sigbye_handler(signal, frame):
    """Exit function triggered by caught signals"""
    sys.exit(0)


if __name__ == "__main__":
    """Main entry point for ConfigCli"""
    # register a clean shutdown for the usual signals
    signal.signal(signal.SIGINT, sigbye_handler)
    signal.signal(signal.SIGQUIT, sigbye_handler)
    signal.signal(signal.SIGTERM, sigbye_handler)

    args = parse_args()
    print(read_ini(args.cfgfile, args.section, args.key))