cat.rs

use std::env;
use std::io;
use std::io::prelude::*;
use std::fs::File;

fn cat(f: &String) -> io::Result<String> {
    let mut f = try!(File::open(f));
    let mut contents = String::new();
    try!(f.read_to_string(&mut contents));

    Ok(contents)
}

fn main() {
    let file_name = env::args().nth(1);
    match file_name {
        Some(f) => {
            let contents = cat(&f);
            if contents.is_ok() {
                print!("{}", contents.unwrap());
            } else {
                println!("error for file {}: {}", f, contents.unwrap_err());
            }
        }
        None => { println!("must supply 1 file..."); }
    }
}