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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.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 Identity) a}
deriving ( Applicative
, Functor
, Monad
, MonadState World
, MonadReader Config
)
evalApp :: App a -> World -> Config -> a
evalApp f world config =
runIdentity (runReaderT (evalStateT (runApp f) world) config)
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