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drag-stuff.el
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drag-stuff.el
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;;; drag-stuff.el --- Drag stuff (lines, words, region, etc...) around
;; Copyright (C) 2010 Johan Andersson
;; Author: Johan Andersson <johan.rejeep@gmail.com>
;; Maintainer: Johan Andersson <johan.rejeep@gmail.com>
;; Version: 0.0.1
;; Keywords: speed, convenience
;; URL: http://github.com/rejeep/drag-stuff
;; This file is NOT part of GNU Emacs.
;;; License:
;; This program is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 3, or (at your option)
;; any later version.
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING. If not, write to the
;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.
;;; Commentary:
;;; Code:
(defvar drag-stuff-mode-map
(let ((map (make-sparse-keymap)))
(define-key map (kbd "<M-up>") 'drag-stuff-up)
(define-key map (kbd "<M-down>") 'drag-stuff-down)
(define-key map (kbd "<M-right>") 'drag-stuff-right)
(define-key map (kbd "<M-left>") 'drag-stuff-left)
map)
"Keymap for `drag-stuff-mode'.")
(defun drag-stuff-up (arg)
"Drag stuff ARG lines up."
(interactive "p")
(if mark-active
(drag-stuff-lines-up arg)
(drag-stuff-line-up arg)))
(defun drag-stuff-down (arg)
"Drag stuff ARG lines down."
(interactive "p")
(if mark-active
(drag-stuff-lines-down arg)
(drag-stuff-line-down arg)))
(defun drag-stuff-right (arg)
"Drag stuff ARG lines to the right."
(interactive "p")
(if mark-active
(drag-stuff-region-right arg)
(drag-stuff-word-right arg)))
(defun drag-stuff-left (arg)
"Drag stuff ARG lines to the left."
(interactive "p")
(if mark-active
(drag-stuff-region-left arg)
(drag-stuff-word-left arg)))
(defun drag-stuff-line-up (arg)
"Drag current line ARG lines up."
(if (> (line-number-at-pos) arg)
(drag-stuff-line-vertically
(lambda (beg end column line)
(delete-region beg end)
(backward-delete-char 1)
(forward-line (+ (- arg) 1))
(goto-char (line-beginning-position))
(insert line)
(newline)
(forward-line -1)
(move-to-column column)))))
(defun drag-stuff-line-down (arg)
"Drag current line ARG lines down."
(if (<= (+ (line-number-at-pos) arg) (count-lines (point-min) (point-max)))
(drag-stuff-line-vertically
(lambda (beg end column line)
(delete-region beg end)
(delete-char 1)
(forward-line (- arg 1))
(goto-char (line-end-position))
(newline)
(insert line)
(move-to-column column)))))
(defun drag-stuff-line-vertically (fn)
"Yields variables used to drag line up and down."
(let* ((column (current-column))
(beg (line-beginning-position))
(end (line-end-position))
(line (buffer-substring-no-properties beg end)))
(funcall fn beg end column line)))
(defun drag-stuff-lines-up (arg)
"Moves all lines in the selected region ARG lines up."
(let ((mark-line (line-number-at-pos (mark)))
(point-line (line-number-at-pos (point))))
(if (> (min mark-line point-line) arg)
(let* ((deactivate-mark nil)
(mark-col (save-excursion (exchange-point-and-mark) (current-column)))
(point-col (current-column))
(bounds (drag-stuff-whole-lines-region))
(beg (car bounds))
(end (car (cdr bounds)))
(region (buffer-substring-no-properties beg end)))
(delete-region beg end)
(backward-delete-char 1)
(forward-line (+ (- arg) 1))
(goto-char (line-beginning-position))
(insert region)
(newline)
(forward-line -1)
;; Restore region
(goto-line mark-line)
(forward-line (- arg))
(move-to-column mark-col)
(exchange-point-and-mark)
(goto-line point-line)
(forward-line (- arg))
(move-to-column point-col)))))
(defun drag-stuff-lines-down (arg)
"Moves all lines in the selected region ARG lines up."
(let ((mark-line (line-number-at-pos (mark)))
(point-line (line-number-at-pos (point))))
(if (<= (+ (max mark-line point-line) arg) (count-lines (point-min) (point-max)))
(let* ((deactivate-mark nil)
(mark-col (save-excursion (exchange-point-and-mark) (current-column)))
(point-col (current-column))
(bounds (drag-stuff-whole-lines-region))
(beg (car bounds))
(end (car (cdr bounds)))
(region (buffer-substring-no-properties beg end)))
(delete-region beg end)
(delete-char 1)
(forward-line (- arg 1))
(goto-char (line-end-position))
(newline)
(insert region)
;; Restore region
(goto-line mark-line)
(forward-line arg)
(move-to-column mark-col)
(exchange-point-and-mark)
(goto-line point-line)
(forward-line arg)
(move-to-column point-col)))))
(defun drag-stuff-whole-lines-region ()
"Return the positions of the region with whole lines included."
(let ((beg end))
(if (> (point) (mark))
(exchange-point-and-mark))
(setq beg (line-beginning-position))
(if mark-active
(exchange-point-and-mark))
(setq end (line-end-position))
(list beg end)))
(defun drag-stuff-region-left (arg)
"Drags region left ARG times."
(if (> (min (point) (mark)) (point-min))
(drag-stuff-region-horizontally (- arg))))
(defun drag-stuff-region-right (arg)
"Drags region right ARG times."
(if (< (max (point) (mark)) (point-max))
(drag-stuff-region-horizontally arg)))
(defun drag-stuff-region-horizontally (arg)
"Drags region horizontally ARG times."
(let* ((beg (mark))
(end (point))
(region (buffer-substring-no-properties beg end))
(deactivate-mark nil))
(delete-region beg end)
(forward-char arg)
(insert region)
(set-mark (+ beg arg))
(goto-char (+ end arg))))
(defun drag-stuff-word-left (arg)
"Drags word left ARG times."
(drag-stuff-word-horizontally (- arg)))
(defun drag-stuff-word-right (arg)
"Drags word right ARG times."
(drag-stuff-word-horizontally arg))
(defun drag-stuff-word-horizontally (arg)
"Drags word horizontally ARG times."
(let ((old-point (point))
(offset (- (save-excursion (forward-word) (point)) (point))))
(condition-case err
(progn
(transpose-words arg)
(backward-char offset))
(error
(goto-char old-point)))))
(define-minor-mode drag-stuff-mode
"Drag stuff around."
:init-value nil
:lighter " drag"
:keymap drag-stuff-mode-map)
(provide 'drag-stuff)
;;; drag-stuff.el ends here