;; At times I need a condition that that is opposite. That gives me two options,
;; * come up with negation test that may not read clearly
;; * wrap the test in a (not test) form
;; * do the test, but swap the /then/ and /else/ parts.
;;
;; Since I'm a lazy programmer, the first two options don't appeal to me. The third option seems ugly to me. This macro takes the second option, but makes it invisible to the programmer.


(defmacro if-not (cond then &rest else)
  "Reverses the meaning of the conditional. Saves some typing and lets the code
read better."
  `(if (not ,cond)
       ,then
     ,@else))