Re: Can emacs open a new line below or above the current line?

[martin rudalics]

I'm using the following:

(defun newline-and-indent-maybe ()
  "Insert newline and re-indent lines if necessary.
On an empty line insert a newline before current line.  At the beginning
of a non-empty line, do `newline-and-indent', move to the beginning of
the line just inserted, and indent that line.  Otherwise, do
`newline-and-indent'.  Fixes up any whitespace at end of old line."
  (interactive)
  (let ((go-back
         (save-excursion
           (delete-horizontal-space)
           (and (bolp) (not (eolp))))))
    (when (and (boundp 'show-paren-overlay-1)
               (overlayp show-paren-overlay-1))
      ;; Remove `show-paren-overlay-1' to avoid flickering.
      (delete-overlay show-paren-overlay-1))
    (newline-and-indent)
    (when go-back
      (forward-line -1)
      (indent-according-to-mode))))

(global-set-key [?\r] 'newline-and-indent-maybe)