module Main where

import System.Environment
import System.Exit

import Compiler
import Optimiser
import Parser
import VM


usage :: IO ()
usage = do
    progname <- getProgName
    putStrLn $ "Usage: " ++ progname ++ " [filename.lisp]"

main :: IO ()
main = do
    clargs <- getArgs
    source <- case clargs of
        [] -> getContents
        [fname] -> readFile fname
        _ -> usage >> exitFailure

    prog <- either (die . show) return (parseProgram source)
    irprog <- either die return (compileProgram prog)
    let opt = optimise irprog
    -- print opt
    vmRun opt