r9078: add ppmx

[kmrcl.git] / macros.lisp

diff --git a/macros.lisp b/macros.lisp
index 9b6150a470dc9597470fe8ad2ba8e303e9c3e853..bf2714b86d441eec6f9d0c4bbce5a64f7f539d73 100644 (file)
--- a/macros.lisp
+++ b/macros.lisp
@@ -239,3 +239,18 @@
      ,@(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)))