ini

#!/usr/bin/env python3
import click
from configparser import ConfigParser

@click.command()
@click.argument("file", type = click.File(), metavar = "<file>")
@click.argument("section", metavar = "<section>")
@click.argument("option", metavar = "<option>")
@click.argument("value", metavar = "<value>", required = False)
@click.pass_context

def ini(ctx, file, section, option, value = None):
    """
    Reads an INI config <file> and prints the value of <section>'s <option> or sets it to <value> (if provided).
    """
    config = ConfigParser()
    config.read_file(file)

    if value is None:
        try:
            value = config[section][option]
        except KeyError:
            ctx.exit(1)
        else:
            click.echo(value)
    else:
        if value:
            if section not in config:
                config.add_section(section)
            config[section][option] = value
        else:
            try:
                del config[section][option]
            except KeyError:
                ctx.exit(1)

        with open(file.name, "w") as f:
            config.write(f)


if __name__ == '__main__':
    ini()