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|
{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE GeneralizedNewtypeDeriving #-}
module Lib where
import Control.Lens (makeLenses)
import Control.Monad.Identity (Identity(..))
import Control.Monad.IO.Class (MonadIO(..))
import Control.Monad.Reader (ReaderT(..), runReaderT)
import Control.Monad.Reader.Class (MonadReader(..))
import Control.Monad.State.Class (MonadState(..))
import Control.Monad.State.Strict (StateT(..), evalStateT)
import Data.Default (Default(..))
data Position = Position { _x :: Int, _y :: Int }
deriving (Show, Read)
instance Default Position where
def = Position 0 0
makeLenses ''Position
data Player = Player {
position :: Position}
deriving (Show, Read)
instance Default Player where
def = Player { position = def }
makeLenses ''Player
newtype Config = Config String
deriving (Show)
data World = World {
player :: Player}
deriving (Show, Read)
instance Default World where
def = World { player = def }
makeLenses ''World
newtype App a = App {
runApp :: StateT World (ReaderT Config IO) a}
deriving ( Applicative
, Functor
, Monad
, MonadState World
, MonadReader Config
, MonadIO
)
evalApp :: App a -> World -> Config -> IO a
evalApp f world config =
runReaderT (evalStateT (runApp f) world) config
|
