(defun gist-region-or-buffer (&optional private)
  "Post either the current region, or if mark is not set, the current buffer as a new paste at gist.github.com
Copies the URL into the kill ring.

With a prefix argument, makes a private paste."
  (interactive "P")
  (condition-case nil
      (gist-region (point) (mark) private)
      (mark-inactive (gist-buffer private))))