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Add mapHaskelineT to interact with the underlying monad #48

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Add mapHaskelineT to interact with the underlying monad #48

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63c7ffa
Add mapHaskelineT
janmasrovira May 25, 2023
d415067
fix
janmasrovira May 25, 2023
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6 changes: 6 additions & 0 deletions src/System/Console/Repline.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,7 @@
{-# LANGUAGE KindSignatures #-}
{-# LANGUAGE LambdaCase #-}
{-# LANGUAGE MultiParamTypeClasses #-}
{-# LANGUAGE RankNTypes #-}
{-# LANGUAGE RecordWildCards #-}
{-# LANGUAGE UndecidableInstances #-}
{-# LANGUAGE NoMonomorphismRestriction #-}
Expand Down Expand Up @@ -136,6 +137,7 @@ module System.Console.Repline
( -- * Repline Monad
HaskelineT,
runHaskelineT,
mapHaskelineT,
MonadHaskeline,

-- * Toplevel
Expand Down Expand Up @@ -203,6 +205,10 @@ newtype HaskelineT (m :: * -> *) a = HaskelineT {unHaskeline :: H.InputT m a}
runHaskelineT :: (MonadMask m, MonadIO m) => H.Settings m -> HaskelineT m a -> m a
runHaskelineT s m = H.runInputT s (H.withInterrupt (unHaskeline m))

-- | Apply a transformation to the unerlying monad
mapHaskelineT :: (forall x. m x -> m x) -> HaskelineT m a -> HaskelineT m a
mapHaskelineT f (HaskelineT s) = HaskelineT (H.mapInputT f s)

class MonadCatch m => MonadHaskeline m where
getInputLine :: String -> m (Maybe String)
getInputChar :: String -> m (Maybe Char)
Expand Down