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import System.Environment( getArgs )
import Data.Typeable
import qualified Control.Exception
import Thue.Parser
import Thue.Interpreter
data ThueException = ThueException { errString :: String }
deriving (Show, Typeable)
instance Control.Exception.Exception ThueException
usageString :: String
usageString = "Usage: thue <program file>"
program :: IO ()
program = do
args <- getArgs
fileContents <- if (length args /= 1)
then Control.Exception.throw (ThueException usageString)
else readFile (head args)
case (parseThue fileContents) of
Left x -> putStrLn (show x)
Right x -> (thue x) >>= (putStrLn . show)
main = Control.Exception.catch program handler
where
handler :: ThueException -> IO ()
handler err = putStrLn (errString err)
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