{-# LANGUAGE AllowAmbiguousTypes #-}

-- This Source Code Form is subject to the terms of the Mozilla Public
-- License, v. 2.0. If a copy of the MPL was not distributed with this
-- file, You can obtain one at https://mozilla.org/MPL/2.0/.

{- |
Copyright   :  (c) 2023 Sayo Koyoneda
License     :  MPL-2.0 (see the file LICENSE)
Maintainer  :  ymdfield@outlook.jp
Stability   :  experimental
Portability :  portable

This module provides the t`Input` effect, comes
from [@Polysemy.Input@](https://hackage.haskell.org/package/polysemy-1.9.1.1/docs/Polysemy-Input.html)
in the @polysemy@ package.
-}
module Data.Effect.Input where

data Input i (a :: Type) where
    Input :: Input i i

makeEffectF [''Input]

inputs :: (Input i <: f, Functor f) => (i -> a) -> f a
inputs :: forall i (f :: * -> *) a.
(Input i <: f, Functor f) =>
(i -> a) -> f a
inputs i -> a
f = i -> a
f (i -> a) -> f i -> f a
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> f i
forall i (f :: * -> *). SendFOE (Input i) f => f i
input