How to undo fill-paragraph in emacs?

Question

I have a text file that is pretty long. Any easy way to \"undo\" a M-q (fill-paragraph) on a file that was written and saved a while ago?

For example, I wan

Answer 1

Use the following from my .emacs:

(defun unfill-paragraph ()
  (interactive)
  (let ((fill-column (point-max)))
    (fill-paragraph nil)))

(defun unfill-region ()
  (interactive)
  (let ((fill-column (point-max)))
    (fill-region (region-beginning) (region-end) nil)))

I can't take credit, I googled this years ago.