20 lines
492 B
Haskell
20 lines
492 B
Haskell
module Main where
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import Control.Monad (forever)
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import Data.Text
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import qualified Data.Text.IO as TIO
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import LambdaCalculus (eagerEval)
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import LambdaCalculus.Parser (parseExpression)
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import System.IO (hFlush, stdout)
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prompt :: Text -> IO Text
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prompt text = do
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TIO.putStr text
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hFlush stdout
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TIO.getLine
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main :: IO ()
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main = forever $ parseExpression <$> prompt ">> " >>= \case
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Left parseError -> putStrLn $ "Parse error: " ++ show parseError
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Right expr -> print $ eagerEval expr
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