use std::env;

#[derive(Debug)]
enum Maybe<T> {
  Just(T),
  Nothing
}

fn main() {
  let arg = env::args().nth(1);

  println!("{:?}", Maybe::Just(42));

  match arg {
    Some(result) => {
      let ip = ip_to_int(&result);
      println!("{:b}", ip);
    },
    None => println!("need one arg")
  }



}

fn ip_to_int(ip_str: &str) -> u32 {
    let mut tbl : Vec<&str> = ip_str.split(".")
      .collect();
    tbl.reverse();

    let mut ip = 0_u32;

  for (idx, s) in tbl.iter().enumerate() {
    let nbr : u8 = s.parse()
      .expect("parse fail");
    ip += (nbr as u32) << 8*idx;
  }
  ip
}