module Pretty (
      (.$)
    , assertRight
    , onRight
  ) where

import System.Exit (die)

(.$) :: (a -> b) -> (b -> c) -> (a -> c)
(.$) f g = g . f

onRight :: (a -> IO b) -> Either String a -> IO b
onRight = either die

assertRight :: Either String a -> IO a
assertRight = onRight return