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{-# LANGUAGE LambdaCase #-}
{-# LANGUAGE TupleSections #-}
module Main where
import Data.List (intersperse)
import System.Environment (getArgs)
import System.Exit (die, exitFailure)
import Parser
main :: IO ()
main = do
(source, fname) <- getArgs >>= \case
[] -> (,"<stdin>") <$> getContents
[fname] -> (,fname) <$> readFile fname
_ -> die "Usage: hs-visinter [filename.hs]"
prog <- case parse fname source of
This errs -> do
sequence_ $ intersperse (putStrLn "") (map (putStrLn . printErrMsg) errs)
exitFailure
These errs res -> do
sequence_ $ intersperse (putStrLn "") (map (putStrLn . printErrMsg) errs)
return res
That res -> return res
print prog
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