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{-# HLINT ignore "Use camelCase" #-}
module Wetterhorn.Core
( WState (..),
WConfig (..),
SurfaceState (..),
W,
getWConfig,
getWState,
runW,
Wetterhorn,
initWetterhorn,
wio,
incrementState,
readWState,
defaultConfig,
requestHotReload,
ctxConfig,
KeyEvent (..),
KeyState (..),
)
where
import Control.Arrow (first)
import Control.Exception
import Control.Monad (when)
import Data.ByteString (ByteString)
import qualified Data.ByteString.Char8 as CH
import Data.Map (Map)
import qualified Data.Map as Map
import Data.Maybe (fromMaybe)
import Foreign (Ptr, StablePtr, Word32, castForeignPtr, newStablePtr, ptrToIntPtr)
import Numeric (showHex)
import Text.Printf
import Wetterhorn.Core.ForeignInterface (ForeignInterface)
import qualified Wetterhorn.Core.ForeignInterface as ForeignInterface
data WContext = WContext
{ ctxForeignInterface :: ForeignInterface,
ctxConfig :: WConfig
}
-- This is the OpaqueState passed to the harness.
type Wetterhorn = StablePtr (WContext, WState)
requestHotReload :: W ()
requestHotReload = do
fi <- ctxForeignInterface <$> getWContext
wio $ ForeignInterface.requestHotReload fi
requestLog :: String -> W ()
requestLog str = do
fi <- ctxForeignInterface <$> getWContext
wio $ ForeignInterface.requestLog fi str
requestExit :: Int -> W ()
requestExit ec = do
fi <- ctxForeignInterface <$> getWContext
wio $ ForeignInterface.requestExit fi ec
initWetterhorn :: WConfig -> IO Wetterhorn
initWetterhorn conf = do
foreignInterface <- ForeignInterface.getForeignInterface
newStablePtr (WContext foreignInterface conf, WState "this is a string" 0)
data WState = WState
{ someString :: String,
integer :: Int
}
deriving (Show, Read)
data SurfaceState = Map | Unmap | Destroy deriving (Eq, Ord, Show, Enum)
data KeyState = KeyPressed | KeyReleased deriving (Show, Read, Eq, Enum, Ord)
data KeyEvent = KeyEvent
{ timeMs :: Word32,
keycode :: Word32,
state :: KeyState,
modifiers :: Word32,
keysym :: Word32,
codepoint :: Char
}
deriving (Show, Read, Ord, Eq)
data WConfig = WConfig
{ keybindingHandler :: KeyEvent -> W Bool,
surfaceHandler :: SurfaceState -> Ptr () -> W ()
}
defaultBindings :: Map (KeyState, Word32, Word32) (W ())
defaultBindings =
Map.fromList
[ ((KeyPressed, 0x8, 0x72), requestHotReload),
((KeyPressed, 0x8, 0x6c), requestLog "This is a log statement!\n"),
((KeyPressed, 0x8, 0x71), requestExit 0)
]
defaultConfig :: WConfig
defaultConfig =
WConfig
{ keybindingHandler = \keyEvent -> do
i <- incrementState
wio $ printf "%d - Got %s\n" i (show keyEvent)
maybe (return False) (fmap (const True)) $
Map.lookup
(state keyEvent, modifiers keyEvent, keysym keyEvent)
defaultBindings,
surfaceHandler = \state ptr -> wio (printf "Surface %s is %s\n" (showHex (ptrToIntPtr ptr) "") (show state))
}
readWState :: ByteString -> IO WState
readWState bs =
catch
(return $ read (CH.unpack bs))
( \e ->
let _ = (e :: SomeException) in return (WState "" 0)
)
newtype W a = W ((WContext, WState) -> IO (a, WState))
instance Functor W where
fmap mfn (W fn) = W $ fmap (first mfn) <$> fn
instance Applicative W where
pure a = W $ \(_, s) -> return (a, s)
mfn <*> ma = do
fn <- mfn
fn <$> ma
instance Monad W where
(W fntoa) >>= fnmb = W $ \(config, state) -> do
(a, state') <- fntoa (config, state)
let W fntob = fnmb a
fntob (config, state')
getWContext :: W WContext
getWContext = W pure
getWConfig :: W WConfig
getWConfig = ctxConfig <$> getWContext
getWState :: W WState
getWState = W $ \(_, s) -> pure (s, s)
runW :: W a -> (WContext, WState) -> IO (a, WState)
runW (W fn) = fn
incrementState :: W Int
incrementState = W $ \(_, WState s i) -> return (i, WState s (i + 1))
wio :: IO a -> W a
wio fn = W $ \(_, b) -> fn >>= \a -> return (a, b)
|
