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import System.Environment( getArgs )
import Control.Exception( ErrorCall(..), Handler(..), catches )
import Unlambda.Parser
import Unlambda.Interpreter
usageString :: String
usageString = "Usage: unlambda <program file>"
program :: IO ()
program = do
args <- getArgs
fileContents <- if (length args /= 1)
then error usageString
else readFile (head args)
case (parseUnlambda fileContents) of
Left x -> putStrLn (show x)
Right x -> unlambda x >>= putStrLn . show
main = catches program
[ Handler ((\e -> putStrLn . show $ e) :: ErrorCall -> IO ()) ]
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