r5167: *** empty log message ***

[kmrcl.git] / lists.lisp

diff --git a/lists.lisp b/lists.lisp
index ed2148ee347cba703e88b21cd44a1f400df42288..8bc548d829f924dabe8bf4b11b56618987e589ad 100644 (file)
--- 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)