Add 'users/glittershark/xanthous/' from commit '53b56744f4'

git-subtree-dir: users/glittershark/xanthous
git-subtree-mainline: 91f53f02d8
git-subtree-split: 53b56744f4

users/glittershark/xanthous/src/Xanthous/Game.hs

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+module Xanthous.Game
+  ( GameState(..)
+  , levels
+  , entities
+  , revealedPositions
+  , messageHistory
+  , randomGen
+  , promptState
+  , GamePromptState(..)
+
+  , getInitialState
+  , initialStateFromSeed
+
+  , positionedCharacter
+  , character
+  , characterPosition
+  , updateCharacterVision
+  , characterVisiblePositions
+  , entitiesAtCharacter
+
+    -- * Messages
+  , MessageHistory(..)
+  , HasMessages(..)
+  , HasTurn(..)
+  , HasDisplayedTurn(..)
+  , pushMessage
+  , previousMessage
+  , nextTurn
+
+    -- * Collisions
+  , Collision(..)
+  , collisionAt
+
+    -- * App monad
+  , AppT(..)
+
+    -- * Saving the game
+  , saveGame
+  , loadGame
+  , saved
+
+    -- * Debug State
+  , DebugState(..)
+  , debugState
+  , allRevealed
+  ) where
+--------------------------------------------------------------------------------
+import qualified Codec.Compression.Zlib as Zlib
+import           Codec.Compression.Zlib.Internal (DecompressError)
+import qualified Data.Aeson as JSON
+import           System.IO.Unsafe
+--------------------------------------------------------------------------------
+import           Xanthous.Prelude
+import           Xanthous.Game.State
+import           Xanthous.Game.Lenses
+import           Xanthous.Game.Arbitrary ()
+import           Xanthous.Entities.Entities ()
+--------------------------------------------------------------------------------
+
+saveGame :: GameState -> LByteString
+saveGame = Zlib.compress . JSON.encode
+
+loadGame :: LByteString -> Maybe GameState
+loadGame = JSON.decode <=< decompressZlibMay
+  where
+    decompressZlibMay bs
+      = unsafeDupablePerformIO
+      $ (let r = Zlib.decompress bs in r `seq` pure (Just r))
+      `catch` \(_ :: DecompressError) -> pure Nothing
+
+saved :: Prism' LByteString GameState
+saved = prism' saveGame loadGame