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

You can set fill-columnn to a really large number, and fill.

C-u 10000 C-x f M-x fill-individual-paragraphs

Or you can use a little custom function:

(defun refill-paragraphs-to-be-one-line ()
  "fill individual paragraphs with large fill column"
  (interactive)
  (let ((fill-column 100000))
    (fill-individual-paragraphs (point-min) (point-max))))