use std::{env::args, fs};

use microlang::{Context, Value};

pub fn main() {
	// Context instantiation.
	let mut context = Context::empty();

	// Definition of built-in function.
	context.define_built("print", |values, _| {
		for val in values {
			print!("{} ", val.serialize());
		}
		println!();
		Ok(Value::None)
	});

	// Script to evaluate.
	let lines = fs::read_to_string(args().nth(1).expect("Pass a file as arg 1.")).expect("File could not be read.");

	// Script evaluation.
	match context.eval(lines) {
		// May return errors raised during parsing or actual evaluation.
		Err(err) => panic!("Failed : {err:?}"),
		// Success returns the parsed AST alongside the value resulting from the evaluation.
		Ok((_, value)) => println!("{}", value.serialize()),
	}
}