X-Git-Url: http://git.kpe.io/?p=kmrcl.git;a=blobdiff_plain;f=lists.lisp;fp=lists.lisp;h=8bc548d829f924dabe8bf4b11b56618987e589ad;hp=ed2148ee347cba703e88b21cd44a1f400df42288;hb=7c7e6a18fd67e5370fd78690da2642cbe79e4113;hpb=0f12822c9d49849c26424743b3744d26056be4cc

diff --git a/lists.lisp b/lists.lisp
index ed2148e..8bc548d 100644
--- a/lists.lisp
+++ b/lists.lisp
@@ -7,7 +7,7 @@
 ;;;; Programmer:    Kevin M. Rosenberg
 ;;;; Date Started:  Apr 2000
 ;;;;
-;;;; $Id: lists.lisp,v 1.6 2003/06/18 17:12:29 kevin Exp $
+;;;; $Id: lists.lisp,v 1.7 2003/06/20 08:35:22 kevin Exp $
 ;;;;
 ;;;; This file, part of KMRCL, is Copyright (c) 2002 by Kevin M. Rosenberg
 ;;;;
@@ -166,7 +166,21 @@
       ((null pl) alist)
     (setq alist (acons (car pl) (cadr pl) alist))))
 
+(defmacro update-plist (pkey value plist &key (test '#'eql))
+  "Macro to support below (setf get-alist)"
+  (let ((pos (gensym)))
+    `(let ((,pos (member ,pkey ,plist :test ,test)))
+       (if ,pos
+	   (progn
+	     (setf (cadr ,pos) ,value)
+	     ,plist)
+	 (setf ,plist (append ,plist (list ,pkey ,value)))))))
+
 (defun get-plist (key plist &key (test 'eql) (missing nil))
   (let-if (pos (member key plist :test test))
 	  (cadr pos)
 	  missing))
+
+(defun (setf get-plist) (value key plist &key (test #'eql))
+  (update-plist key value plist :test test)
+  value)