Thread random generate through creature update

src/Dodge/Update.hs

@@ -31,7 +31,8 @@ import qualified Data.IntMap.Lazy as IM
 import qualified Data.Map as M
 import Control.Lens
 import Data.Monoid
---import System.Random
+import System.Random
+--import Data.Bifunctor
 
 update :: World -> World
 update = functionalUpdate . pushSideEffects
@@ -136,10 +137,18 @@ updateParticles w = set particles (catMaybes ps) w'
   where 
     (w',ps) = mapAccumR (\a b -> _ptUpdate' b a b) w $ _particles w
 
+-- Note that this updates the randgen
 updateCreatures :: World -> World
-updateCreatures w = appEndo f $ w & creatures .~ IM.mapMaybe id m
+updateCreatures w = appEndo f $ w 
+    & creatures .~ IM.mapMaybe id m
+    & randGen   .~ newg
   where
-    (f,m) = traverse (\cr -> _crUpdate cr cr w) (_creatures w)
+    ((f,newg),m) = mapAccumR crUp (Endo id,_randGen w) (_creatures w)
+    crUp (f',g) cr = ((f' <> f'',g'), cr')
+      where
+        (f'',cr') = _crUpdate cr cr (w & randGen .~ g)
+        (_,g') = genWord8 g
+    
 
 {- |
 Apply door mechanisms.  -}