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coping emacs #1

After having written a lot of erlang code with emacs(uhhm ... no, erlide, the erlang eclipse plugin, is not yet a viable alternative...), I decided to start (back-)porting eclipse features to emacs. Yeahhhh! I am now among those 1337 |-|4><025 that have their own ".emacs" in ~.

Well one feature, that I can't live without, is moving the current line with Alt - up/down, this is really usefull together with anotherthe other feature: duplicating the current line(Ctrl-Alt-up/down).

Below is the elisp code that provides these features and binds them to the keys these are bound to in eclipse. Note: In contrast to the eclipse version of this feature, this implementation does not(yet) work with regions, but with lines only.

Ok, put this in your ~/.emacs

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Written by Sven Heyll in 2008
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(defun sh-wind-col (thunk)
  (let ((col (- (point) (line-beginning-position))))
    (apply thunk '())
    (beginning-of-line)
    (forward-char col)))

(defun sh-with-current-line (func)
  (let ((cline (buffer-substring (line-beginning-position) (line-end-position))))
    (apply func `(,cline))))

(defun sh-dup-line-down ()
  (interactive)
  (sh-wind-col
   (lambda ()
     (sh-with-current-line
      (lambda (cline)
 (end-of-line)
 (insert ?\n)
 (insert cline))))))

(defun sh-dup-line-up ()
  (interactive)
  (sh-wind-col
   (lambda ()
     (sh-with-current-line
      (lambda (cline)
 (beginning-of-line)
 (insert cline)
 (insert ?\n)
 (forward-line -1))))))

(global-set-key [C-M-down] 'sh-dup-line-down)
(global-set-key [C-M-up]   'sh-dup-line-up)
   
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(defun sh-move-line (dir)
  (defun extract-a-line (dir)
    (let ((line-start (line-beginning-position (+ 1 dir)))
   (line-end   (line-end-position (+ 1 dir))))
      (setq res (delete-and-extract-region line-start line-end))
      (delete-region line-start (+ 1 line-start))
      res))
  (if (not 
       (or 
 (and (< dir 0) (= (line-beginning-position) (point-min)))
 (and (> dir 0) (= (line-end-position) (- (point-max) 1)))))
      (let
   ((col (- (point) (line-beginning-position)))
    (line (extract-a-line dir)))
 (if (< dir 0)
     (progn
       (end-of-line)
       (insert ?\n)
       (insert line))
   (progn 
     (beginning-of-line)
     (insert line)
     (insert ?\n)))
 (beginning-of-line (truncate (+ 0.5 (* 0.5 dir))))
 (forward-char col))))
  
(defun sh-line-down ()
  (interactive)
  (sh-move-line 1))

(defun sh-line-up ()
  (interactive)
  (sh-move-line -1))

(global-set-key [M-down] 'sh-line-down)
(global-set-key [M-up] 'sh-line-up)

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

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