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🔥 Control.Effect.REPL.

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This commit is contained in:
Patrick Thomson 2019-05-08 11:04:33 -04:00
parent 46bcc03437
commit ec03076cf1
1 changed files with 4 additions and 10 deletions
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14
src/Control/Effect/REPL.hs
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@ -1,4 +1,4 @@
{-# LANGUAGE GeneralizedNewtypeDeriving, KindSignatures, TypeOperators, UndecidableInstances #-}
{-# LANGUAGE DeriveAnyClass, DerivingStrategies, GeneralizedNewtypeDeriving, KindSignatures, TypeOperators, UndecidableInstances #-}
module Control.Effect.REPL
( REPL (..)
@ -20,14 +20,8 @@ import qualified Data.Text as T
data REPL (m :: * -> *) k
= Prompt Text (Maybe Text -> k)
| Output Text k
deriving (Functor)
instance HFunctor REPL where
hmap _ = coerce
instance Effect REPL where
handle state handler (Prompt p k) = Prompt p (handler . (<$ state) . k)
handle state handler (Output s k) = Output s (handler (k <$ state))
deriving stock Functor
deriving anyclass (HFunctor, Effect)
prompt :: (Member REPL sig, Carrier sig m) => Text -> m (Maybe Text)
prompt p = send (Prompt p pure)
@ -39,7 +33,7 @@ runREPL :: Prefs -> Settings IO -> REPLC m a -> m a
runREPL prefs settings = runReader (prefs, settings) . runREPLC
newtype REPLC m a = REPLC { runREPLC :: ReaderC (Prefs, Settings IO) m a }
deriving (Functor, Applicative, Monad, MonadIO)
deriving newtype (Functor, Applicative, Monad, MonadIO)
instance (Carrier sig m, MonadIO m) => Carrier (REPL :+: sig) (REPLC m) where
eff (L op) = do