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41 lines
966 B
Haskell
41 lines
966 B
Haskell
module Main where
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import Graphics.Vty
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import Control.Applicative
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import Control.Arrow
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import Control.Monad.RWS
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import Data.Sequence (Seq, (<|) )
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import qualified Data.Sequence as Seq
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import Data.Foldable
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eventBufferSize = 1000
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type App = RWST Vty () (Seq String) IO
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main = do
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vty <- mkVty defaultConfig
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_ <- execRWST (vtyInteract False) vty Seq.empty
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shutdown vty
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vtyInteract :: Bool -> App ()
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vtyInteract shouldExit = do
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updateDisplay
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unless shouldExit $ handleNextEvent >>= vtyInteract
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updateDisplay :: App ()
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updateDisplay = do
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let info = string defAttr "Press ESC to exit."
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eventLog <- foldMap (string defAttr) <$> get
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let pic = picForImage $ info <-> eventLog
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vty <- ask
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liftIO $ update vty pic
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handleNextEvent = ask >>= liftIO . nextEvent >>= handleEvent
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where
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handleEvent e = do
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modify $ (<|) (show e) >>> Seq.take eventBufferSize
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return $ e == EvKey KEsc []
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