{-# LANGUAGE LambdaCase, TupleSections #-}
module Main where

import System.Environment
import System.Exit

import Compiler
import CompilerMacros
import Optimiser
import Parser
import VM


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

main :: IO ()
main = do
    (mfname, source) <- getArgs >>= \case
        [] -> (Nothing,) <$> getContents
        [arg] -> (Just arg,) <$> readFile arg
        _ -> usage >> exitFailure

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