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Use LiftC instead of TransC to define ReadlineC.

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This commit is contained in:
Rob Rix 2019-07-15 16:20:07 -04:00
parent ba8e03b111
commit 6fe74f012a
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1 changed files with 5 additions and 4 deletions
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semantic-core/src/Control/Effect/Readline.hs
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@ -19,6 +19,7 @@ module Control.Effect.Readline
import Prelude hiding (print)
import Control.Effect.Carrier
import Control.Effect.Lift
import Control.Effect.Reader
import Control.Monad
import Control.Monad.IO.Class
@ -58,15 +59,15 @@ newtype Line = Line Int64
increment :: Line -> Line
increment (Line n) = Line (n + 1)
newtype ReadlineC m a = ReadlineC { runReadlineC :: ReaderC Line (TransC InputT m) a }
newtype ReadlineC m a = ReadlineC { runReadlineC :: ReaderC Line (LiftC (InputT m)) a }
deriving newtype (Applicative, Functor, Monad, MonadIO)
runReadline :: MonadException m => Prefs -> Settings m -> ReadlineC m a -> m a
runReadline prefs settings = runInputTWithPrefs prefs settings . runTransC . runReader (Line 0) . runReadlineC
runReadline prefs settings = runInputTWithPrefs prefs settings . runM . runReader (Line 0) . runReadlineC
instance (Carrier sig m, Effect sig, MonadException m, MonadIO m) => Carrier (Readline :+: sig) (ReadlineC m) where
instance (MonadException m, MonadIO m) => Carrier (Readline :+: Lift (InputT m)) (ReadlineC m) where
eff (L (Prompt prompt k)) = ReadlineC $ do
str <- lift (TransC (getInputLine (cyan <> prompt <> plain)))
str <- lift (lift (getInputLine (cyan <> prompt <> plain)))
local increment (runReadlineC (k str))
where cyan = "\ESC[1;36m\STX"
plain = "\ESC[0m\STX"