X-Git-Url: http://git.kpe.io/?p=kmrcl.git;a=blobdiff_plain;f=macros.lisp;h=1239eb46b6d7d7cce32b073edc15d0d53a23efe8;hp=9b6150a470dc9597470fe8ad2ba8e303e9c3e853;hb=450dc904b65d24f9c4f19b39b330bec596ee183c;hpb=526eef1b59e071cbb4ecd35f73a14c1a3f8e32b6

diff --git a/macros.lisp b/macros.lisp
index 9b6150a..1239eb4 100644
--- a/macros.lisp
+++ b/macros.lisp
@@ -239,3 +239,24 @@
      ,@(mapcar
 	(lambda (x) (list 'ignore-errors x))
 	forms)))
+
+(defmacro ppmx (form)
+  "Pretty prints the macro expansion of FORM."
+  `(let* ((exp1 (macroexpand-1 ',form))
+	  (exp (macroexpand exp1))
+	  (*print-circle* nil))
+     (cond ((equal exp exp1)
+	    (format t "~&Macro expansion:")
+	    (pprint exp))
+	   (t (format t "~&First step of expansion:")
+	      (pprint exp1)
+	      (format t "~%~%Final expansion:")
+	      (pprint exp)))
+     (format t "~%~%")
+     (values)))
+
+(defmacro defconst (symbol value &optional doc)
+   `(defconstant ,symbol (if (boundp ',symbol)
+                             (symbol-value ',symbol)
+                             ,value)
+     ,@(when doc (list doc))))