How do I get Emacs to fill sentences, but not paragraphs?

Question

I\'ve seen at least two recommendations on StackOverflow to insert newlines between sentences when editing LaTeX documents. The reason being that the practice facilitates so

Answer 1

I have been meaning to do this forever and I recently found this blog post which worked fairly well for me. So here is (a slightly modified version of) what I have been using for a few days.

(defun auto-fill-by-sentences ()
  (if (looking-back (sentence-end))
      ;; Break at a sentence
      (progn
        (LaTeX-newline)
        t)
    ;; Fall back to the default
    (do-auto-fill)))
(add-hook 'LaTeX-mode-hook (lambda () (setq auto-fill-function 'auto-fill-by-sentences)))

;; Modified from http://pleasefindattached.blogspot.com/2011/12/emacsauctex-sentence-fill-greatly.html
(defadvice LaTeX-fill-region-as-paragraph (around LaTeX-sentence-filling)
  "Start each sentence on a new line."
  (let ((from (ad-get-arg 0))
        (to-marker (set-marker (make-marker) (ad-get-arg 1)))
        tmp-end)
    (while (< from (marker-position to-marker))
      (forward-sentence)
      ;; might have gone beyond to-marker---use whichever is smaller:
      (ad-set-arg 1 (setq tmp-end (min (point) (marker-position to-marker))))
      ad-do-it
      (ad-set-arg 0 (setq from (point)))
      (unless (or (looking-back "^\\s *")
                  (looking-at "\\s *$"))
        (LaTeX-newline)))
    (set-marker to-marker nil)))
(ad-activate 'LaTeX-fill-region-as-paragraph)