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fix: asyncpipe is mfunctor

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orion 2024-06-23 20:49:01 -05:00
parent cda67508d4
commit dc1ba322a9
Signed by: orion
GPG Key ID: 6D4165AE4C928719
1 changed files with 13 additions and 1 deletions
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14
src/Pipes.Async.purs
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@ -8,7 +8,7 @@ import Control.Monad.Error.Class (class MonadError, class MonadThrow, catchError
import Control.Monad.Except (ExceptT, runExceptT)
import Control.Monad.Fork.Class (class MonadBracket, class MonadFork, fork)
import Control.Monad.Maybe.Trans (MaybeT(..), runMaybeT)
import Control.Monad.Morph (hoist)
import Control.Monad.Morph (class MFunctor, hoist)
import Control.Monad.Rec.Class (class MonadRec, Step(..), tailRecM)
import Control.Monad.ST.Class (liftST)
import Control.Monad.ST.Ref (STRef)
@ -131,6 +131,18 @@ getAsyncIO (Pure _) = pure Nothing
instance MonadTrans (AsyncPipe a b) where
lift = M <<< map Pure
instance MFunctor (AsyncPipe a b) where
hoist _ (Pure a) = Pure a
hoist f (M m) = M $ f $ hoist f <$> m
hoist f (AsyncIO ({read, write, awaitWrite, awaitRead} /\ m)) =
AsyncIO
$ { read: f read
, write: f <<< write
, awaitWrite: f awaitWrite
, awaitRead: f awaitRead
}
/\ hoist f m
instance Monad m => Functor (AsyncPipe a b m) where
map f (Pure r) = Pure $ f r
map f (M m) = M $ map f <$> m