extern crate rhai;

use std::fmt::Display;
use std::process::exit;
use std::io::{stdin, stdout, Write};
use rhai::{Engine, Scope, FnRegister};

fn showit<T: Display>(x: &mut T) -> () {
    println!("{}", x)
}

fn quit() { exit(0); }

pub fn main() {
	let mut engine = Engine::new();
	let mut scope = Scope::new();

	engine.register_fn("print", showit as fn(x: &mut i32)->());
    engine.register_fn("print", showit as fn(x: &mut i64)->());
    engine.register_fn("print", showit as fn(x: &mut u32)->());
    engine.register_fn("print", showit as fn(x: &mut u64)->());
    engine.register_fn("print", showit as fn(x: &mut f32)->());
    engine.register_fn("print", showit as fn(x: &mut f64)->());
    engine.register_fn("print", showit as fn(x: &mut bool)->());
    engine.register_fn("print", showit as fn(x: &mut String)->());
    engine.register_fn("exit", quit);

	loop {
		print!("> ");
		let mut input = String::new();
		stdout().flush().expect("couldn't flush stdout");
		if let Err(e) = stdin().read_line(&mut input)  {
			println!("input error: {}", e);
		}

		if let Err(e) = engine.consume_with_scope(&mut scope, &input) {
			println!("error: {}", e);
		}
	}
}