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module Minilang.IO where
import qualified Data.ByteString as BS
import qualified Data.Text as Text
import Data.Text.Encoding
( decodeUtf8With,
encodeUtf8,
)
import Data.Text.Encoding.Error (lenientDecode)
import Minilang.Lambda.Eval (eval)
import System.IO (Handle)
-- | Read a "program" from @hin@ handle, evaluate it and dump the result
-- on @hout@.
runEval :: Handle -> Handle -> IO ()
runEval hin hout = do
programText <- Text.unpack . decodeUtf8With lenientDecode <$> BS.hGetContents hin
let ast = read programText
env = mempty
result = eval ast env
BS.hPut
hout
(encodeUtf8 (Text.pack (show result) <> "\n"))
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