incl args

/* print is part of the standard library */
func print_str(str: string) {
    print("{str}\n")
}

func loop_print(str: string, n: int) {
    if n == 0 {
        loop {
            print_str(str)
        }
    } else {
        i = 0;
        while i < n {
            i++;
            print_str(str)
        }
    }
}

p = args::Parser::new();

/**
 * Add two arguments so that the program can be executed this way:
 * jinko yes.jk [ <str> ] [ -n|--number <n> ]
 */
p.add_argument("str").help("String to echo").default("y");
p.add_argument("number")
    .help("Number of times for which the string should be printed")
    .short("n")     // These two would have been determined by default from
    .long("number") // the argument's name (parameter of add_argument()
    .fn(int::from_str())
    .default(0);

args = p.parse();

/**
 * Since there are defaults, we know that there will always be something so we can
 * `unwrap` away. If we hadn't added the defaults, this might have caused an error
 *
 * Since we have to handle Options and Results, just typing
 * ```
 * args.get("number");
 * ```
 * would have caused an error
 */
mut n = args.get("number").ok();
mut str = args.get("str").ok();

loop_print(str, n)