inc 0.1.1

Incremental approach to compiler construction
Documentation 
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extern crate inc;

use inc::Config;
use std::env;
use std::io::{self, Read};

fn main() -> Result<(), inc::Error> {
    let mut config = cli();

    inc::compile(&mut config)
}

// Config controls the external interaction of the program by providing it with
// input and giving the compiler a file to write results to.
//
// Cli expects the program in stdin, writes generated assembly to file name
// specified as first argument or defaults to stdout.
//
fn cli() -> Config {
    let args: Vec<String> = env::args().collect();

    let mut program = String::new();

    io::stdin()
        .read_to_string(&mut program)
        .expect("Expected a program in stdin");

    // impl Writer
    let output = if args.len() == 1 {
        String::from("/dev/stdout")
    } else {
        args[1].clone()
    };

    Config { program, output }
}