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

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Here’s what I use, which was mostly cribbed from Luca de Alfaro:

(defun fill-sentence ()
  (interactive)
  (save-excursion
    (or (eq (point) (point-max)) (forward-char))
    (forward-sentence -1)
    (indent-relative t)
    (let ((beg (point))
          (ix (string-match "LaTeX" mode-name)))
      (forward-sentence)
      (if (and ix (equal "LaTeX" (substring mode-name ix)))
          (LaTeX-fill-region-as-paragraph beg (point))
        (fill-region-as-paragraph beg (point))))))

I bind this to M-j with

(global-set-key (kbd "M-j") 'fill-sentence)

The references to "LaTeX" are for AUCTeX support. If you don’t use AUCTeX, the let can be simplified to

(let (beg (point))
  (forward-sentence)
  (fill-region-as-paragraph beg (point)))

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