getoptstest2.rs

use std;
import std::getopts::*;
import result::*;

fn do_work(in: str, out: option<str>) {
  // ...
}

fn print_usage(program: str) {
  std::io::println("Usage: " + program + " [options]");
  std::io::println("-o\t\tOutput");
  std::io::println("-h --help\tUsage");
}

fn main(args: [str]) {
  check vec::is_not_empty(args);

  let program : str = vec::head(args);

  let opts = [
    optopt("o"),
    optflag("h"),
    optflag("help")
  ];
  let match = alt getopts(vec::tail(args), opts) {
    ok(m) { m }
    err(f) { fail fail_str(f) }
  };
  if opt_present(match, "h") || opt_present(match, "help") {
    print_usage(program);
    ret;
  }
  let output = opt_maybe_str(match, "o");
  let input = if !vec::is_empty(match.free) {
    match.free[0]
  } else {
    print_usage(program);
    ret;
  };
  do_work(input, output);
}