Add exit actor that doesn't really work yet.

modules/game/actors.scm

@@ -1,5 +1,4 @@
 (define-module (game actors)
-  #:use-module (dom canvas)
   #:use-module (goblins core)
   #:use-module (ice-9 match)
   #:export (^cell
@@ -11,6 +10,14 @@
     ((new-val)
      (bcom (^cell bcom new-val)))))
 
+(define (^exit bcom)
+  (match-lambda*
+    (('tick) #f)
+    (('wire-state) #f)
+    (('set-wire-state) #f)
+    (('describe) '(exit))
+    (('collide) 'goal)))
+
 (define (^wall bcom type)
   (match-lambda*
     (('tick) #f)
@@ -100,6 +107,7 @@
            (occupant
             (match ($ occupant 'collide)
               ('stop #f)
+              ('goal (pk 'GOAL))
               ('displace
                (let ((next-cell (grid-ref grid (wrap-x (+ x dx)) (wrap-y (+ y dy)))))
                  (match ($ next-cell)
@@ -107,7 +115,8 @@
                     ($ next-cell ($ cell))
                     ($ cell player)
                     ($ old-cell #f)
-                    ($ player-coords (vector x y)))
+                    ($ player-coords (vector x y))
+                    'displace)
                    (_ #f)))))))))))
   (define (warp-player x y)
     ($ (grid-ref grid x y) player)
@@ -166,6 +175,9 @@
 
   ;; TODO: actually write levels
   (warp-player 10 8)
+
+  ($ (grid-ref grid 3 7) (spawn ^exit))
+
   ($ (grid-ref grid 4 4) (spawn ^wall 'brick))
 
   ($ (grid-ref grid 4 3) (spawn ^clock-emitter 3))
@@ -198,9 +210,11 @@
                        (refr ($ refr 'describe))))))
        grid*))
     (('move-player dir)
-     (match dir
-       ('up (move-player 0 -1))
-       ('down (move-player 0 1))
-       ('left (move-player -1 0))
-       ('right (move-player 1 0)))
-     (tick))))
+     (define result
+       (match dir
+         ('up (move-player 0 -1))
+         ('down (move-player 0 1))
+         ('left (move-player -1 0))
+         ('right (move-player 1 0))))
+     (tick)
+     result)))