initial implementation of bat's update function (todo: make bat oscillate up and down while it also moves in x axis, and also code bat's collisions with player, adding to falling list if necessary, or being filtered by player's attack)

fcore/enemy/enemy-patch.sml

@@ -8,6 +8,7 @@ sig
   | W_Y_AXIS of GameType.y_axis
   | W_PLAT_ID of int
   | W_NEXT_PLAT_ID of int
+  | W_BAT_REST of int
 
   val withPatch: GameType.enemy * enemy_patch -> GameType.enemy
 
@@ -24,6 +25,7 @@ struct
   | W_Y_AXIS of GameType.y_axis
   | W_PLAT_ID of int
   | W_NEXT_PLAT_ID of int
+  | W_BAT_REST of int
 
   fun mkEnemy
     (id, health, x, y, xAxis, yAxis, variant, platID, nextPlatID, batRest) =
@@ -136,6 +138,19 @@ struct
             , nextPlatID
             , batRest
             )
+      | W_BAT_REST batRest =>
+          mkEnemy
+            ( id
+            , health
+            , x
+            , y
+            , xAxis
+            , yAxis
+            , variant
+            , platID
+            , nextPlatID
+            , batRest
+            )
     end
 
   fun withPatches (enemy, lst) =