Re: Keybinding to transpose current line with next line

[Emanuel Berg via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org>]

> set up [...] aliases as fit...

Sure!

(defun move-line (&optional lines)
  (interactive "*p")
  (let ((lin (line-number-at-pos))
        (col (current-column))
        (num-lines (or lines 1)) )
    (beginning-of-line)
    (let ((line (thing-at-point 'line)))
      (delete-region (point-at-bol) (point-at-eol))
      (delete-char 1)
      (goto-char (point-min))
      (forward-line (+ lin num-lines -1))
      (insert line)
      (forward-line -1)
      (beginning-of-line)
      (forward-char col) )))
(defalias 'ml #'move-line)
(defalias 'mlb (lambda () (interactive) (move-line -1)))

I.e.,:

  Forward  1: M-x    ml  RET
  Backward 1: M-x    mlb RET
  Forward  X: C-u  X ml  RET
  Backward X: C-u -X ml  RET

Also the usual:

  Forward  4: C-u     ml RET
  Forward 16: C-u C-u ml RET

etc

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