-- This file is part of the Wire Server implementation.
--
-- Copyright (C) 2025 Wire Swiss GmbH <opensource@wire.com>
--
-- This program is free software: you can redistribute it and/or modify it under
-- the terms of the GNU Affero General Public License as published by the Free
-- Software Foundation, either version 3 of the License, or (at your option) any
-- later version.
--
-- This program is distributed in the hope that it will be useful, but WITHOUT
-- ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
-- FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
-- details.
--
-- You should have received a copy of the GNU Affero General Public License along
-- with this program. If not, see <https://www.gnu.org/licenses/>.

module Polysemy.Testing where

import Imports
import Polysemy
import Polysemy.Internal

-- | @'intersperse' m a@ runs @m@ before every action in @a@. In this way, it's
-- like injecting logic into each bind. Useful for polling asynchronous results
-- when testing IO.
intersperse ::
  Sem r () ->
  Sem r a ->
  Sem r a
intersperse a (Sem m) =
  Sem $ \k -> m $ \u -> do
    usingSem k a
    k u
