Inverse of M-q, an unfill-paragraph-function

Question

Is there an inverse for M-q, some kind of unfill-paragraph-function?

If I have undo data, then it\'s of course easy. What I am asking for is

Answer 1

Here's the answer. In short:

(defun unfill-paragraph ()
  "Replace newline chars in current paragraph by single spaces.
This command does the reverse of `fill-paragraph'."
  (interactive)
  (let ((fill-column 90002000))
    (fill-paragraph nil)))

(defun unfill-region (start end)
  "Replace newline chars in region by single spaces.
This command does the reverse of `fill-region'."
  (interactive "r")
  (let ((fill-column 90002000))
    (fill-region start end))) 

Update: I've packaged this up here and it can be installed from Marmalade or Melpa.