feat(xanthous): Gormlaks yell in gormlak when they see the character

Add a new "greetedCharacter" field to the creature hippocampus type,
which tracks whether or not that creature has greeted the character
yet. In the gormlak AI, when the gormlak sees the character and starts
running towards them, if that field is set to False send a message that
says that the gormlak yells a single randomly-generated gormlak word at
the character, then set the field to true

The gormlak yells "gukblom"!

Change-Id: I17a388393693a322c2e09390884ed718911b2fc4
Reviewed-on: https://cl.tvl.fyi/c/depot/+/3207
Reviewed-by: grfn <grfn@gws.fyi>
Tested-by: BuildkiteCI

users/grfn/xanthous/src/Xanthous/Game/Lenses.hs

@@ -9,10 +9,12 @@ module Xanthous.Game.Lenses
   , updateCharacterVision
   , characterVisiblePositions
   , characterVisibleEntities
+  , positionIsCharacterVisible
   , getInitialState
   , initialStateFromSeed
   , entitiesAtCharacter
   , revealedEntitiesAtPosition
+  , hearingRadius
 
     -- * Collisions
   , Collision(..)
@@ -93,8 +95,13 @@ character = positionedCharacter . positioned
 characterPosition :: Lens' GameState Position
 characterPosition = positionedCharacter . position
 
+-- TODO make this dynamic
 visionRadius :: Word
-visionRadius = 12 -- TODO make this dynamic
+visionRadius = 12
+
+-- TODO make this dynamic
+hearingRadius :: Word
+hearingRadius = 12
 
 -- | Update the revealed entities at the character's position based on their
 -- vision
@@ -116,6 +123,10 @@ characterVisibleEntities game =
   let charPos = game ^. characterPosition
   in visibleEntities charPos visionRadius $ game ^. entities
 
+positionIsCharacterVisible :: MonadState GameState m => Position -> m Bool
+positionIsCharacterVisible p = (p `elem`) <$> characterVisiblePositions
+-- ^ TODO optimize
+
 entitiesCollision
   :: ( Functor f
     , forall xx. MonoFoldable (f xx)
@@ -149,11 +160,12 @@ revealedEntitiesAtPosition
   => Position
   -> m (VectorBag SomeEntity)
 revealedEntitiesAtPosition p = do
+  allRev <- use $ debugState . allRevealed
   cvps <- characterVisiblePositions
   entitiesAtPosition <- use $ entities . EntityMap.atPosition p
   revealed <- use revealedPositions
   let immobileEntitiesAtPosition = filter (not . entityCanMove) entitiesAtPosition
-  pure $ if | p `member` cvps
+  pure $ if | allRev || p `member` cvps
               -> entitiesAtPosition
             | p `member` revealed
               -> immobileEntitiesAtPosition