From 75d1bbb394aa23715811cac3da7ad6b202df26cf Mon Sep 17 00:00:00 2001
From: jsancho <devnull@localhost>
Date: Fri, 3 Jun 2011 16:04:12 +0000
Subject: [PATCH]

---
 src/gacela_misc.scm |  4 ++++
 src/gacela_mobs.scm | 44 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 48 insertions(+)

diff --git a/src/gacela_misc.scm b/src/gacela_misc.scm
index b75a44e..d486b26 100644
--- a/src/gacela_misc.scm
+++ b/src/gacela_misc.scm
@@ -20,3 +20,7 @@
     (cond ((> (* p 2) n) p)
 	  (else (power (* p 2) n))))
   (power 1 n))
+
+(define-macro (pushnew elem list)
+  `(cond ((not (find (lambda (e) (eq? e ,elem)) ,list))
+	  (set! ,list (cons ,elem ,list)))))
diff --git a/src/gacela_mobs.scm b/src/gacela_mobs.scm
index 12a0ef1..9e971b9 100755
--- a/src/gacela_mobs.scm
+++ b/src/gacela_mobs.scm
@@ -38,6 +38,50 @@
 
 ;;; Mob Factory
 
+(define add-mob #f)
+(define kill-mob #f)
+(define kill-all-mobs #f)
+(define refresh-active-mobs #f)
+(define action-mobs #f)
+(define render-mobs #f)
+
+(let ((active-mobs '()) (mobs-to-add '()) (mobs-to-kill '())
+  (set! add-mob
+	(lambda (mob)
+	  (pushnew mob mobs-to-add)))
+
+  (set! kill-mob
+	(lambda (mob)
+	  (pushnew mob mobs-to-kill))
+
+  (set! kill-all-mobs
+	(lambda ()
+	  (set! active-mobs '())
+	  (set! mobs-to-add '())
+	  (set! mobs-to-kill '())))
+
+  (set! refresh-active-mobs
+	(lambda ()
+	  (define (add active to-add)
+	    (cond ((null? to-add) active)
+		  (else
+		   (pushnew (car to-add) active)
+		   (add active (cdr to-add)))))
+
+	  (add active-mobs mobs-to-add)
+	  (set! mobs-to-add '())
+	  (set! active-mobs (reverse (lset-difference eq? active-mobs mobs-to-kill)))
+	  (set! mobs-to-kill '())))
+
+  (set! action-mobs
+	(lambda ()
+	  (map (lambda (m) (m #:action)) active-mobs)))
+
+  (set! render-mobs
+	(lambda ()
+	  (map (lambda (m) (m #:render)) active-mobs))))
+
+
 (define-macro (makemob name . methods)
   `(define* (,name . args)
      (let ((option (car args)))
-- 
2.39.2