#![feature(associated_type_defaults)]

#[macro_use] extern crate lazy_static;

#[macro_export] macro_rules! unwrap {
    ($err:expr) => {
	match $err {
	    Ok(v) => v,
	    Err(e) => {
		eprintln!("Error: {}", e);
		std::process::exit(1);
	    }
	}
    };
}

mod arg;

mod conv;

fn main() {
    use arg::Operation;
    match unwrap!(arg::parse_args()) {
	Operation::Help => arg::usage(),
	Operation::Convert(unit, from) => {
	    unwrap!(conv::dispatch_out(unit, from));
	},
    }
}