Using CEPL to interactively play with some OpenGL stuff. Would look neat-o with some music.

I had a comment on another video asking how to recompile functions as a program is running. This is the answer.

The code follows:
(defun update-swank ()
 "Called from within the main loop, this keep the lisp repl
  working while cepl runs"
 (continuable
   (let ((connection (or swank::*emacs-connection*
    (swank::default-connection))))
     (when connection
(swank::handle-requests connection t)))))

(defmacro continuable (&body body)
 "Helper macro that we can use to allow us to continue from an
  error. Remember to hit C in slime or pick the restart so
  errors don't kill the app."
 `(restart-case
      (progn ,@body)
    (continue () :report "Continue")))