X-Git-Url: https://git.jsancho.org/?a=blobdiff_plain;f=src%2Fgacela_misc.scm;h=42c8841f7e0bf132848a09eab5a5b315b1f91a58;hb=023823491bfe1a64e136bcc2d47c6ec5803f23bf;hp=b75a44eb1cf91a4d1c1158db9c754a5c06687b0a;hpb=042f93e750461b4d7235f702c973f0bd1effcae9;p=gacela.git

diff --git a/src/gacela_misc.scm b/src/gacela_misc.scm
index b75a44e..42c8841 100644
--- a/src/gacela_misc.scm
+++ b/src/gacela_misc.scm
@@ -15,8 +15,20 @@
 ;;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 
+
+;;; Additional modules
+
+(use-modules (srfi srfi-1))
+
+
+;;; Functions
+
 (define (nearest-power-of-two n)
   (define (power p n)
     (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)))))