Streaming json pretty printer

jsonpp.rs

extern crate rustc_serialize;

use std::io;
use rustc_serialize::json::Json;

fn main() {
    loop {
        let mut input = String::new();
        io::stdin().read_line(&mut input).unwrap();

        let raw = input.trim();
        if raw.len() == 0 {
            continue
        }

        match Json::from_str(raw) {
            Ok(data) => println!("{}\n", data.pretty()),
            Err(_) => println!("\nERROR PARSING LINE:\n{}\n", raw),
        }
    }
}