| 1 | ;;; delsel.el --- delete selection if you insert |
| 2 | |
| 3 | ;;; Copyright (C) 1992 Free Software Foundation, Inc. |
| 4 | |
| 5 | ;; Author: Matthieu Devin <devin@lucid.com> |
| 6 | ;; Created: 14 Jul 92 |
| 7 | ;; Last change 18-Feb-93, devin. |
| 8 | |
| 9 | ;;; This file is part of GNU Emacs. |
| 10 | |
| 11 | ;;; GNU Emacs is free software; you can redistribute it and/or modify |
| 12 | ;;; it under the terms of the GNU General Public License as published by |
| 13 | ;;; the Free Software Foundation; either version 2, or (at your option) |
| 14 | ;;; any later version. |
| 15 | |
| 16 | ;;; GNU Emacs is distributed in the hope that it will be useful, |
| 17 | ;;; but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 19 | ;;; GNU General Public License for more details. |
| 20 | |
| 21 | ;;; You should have received a copy of the GNU General Public License |
| 22 | ;;; along with GNU Emacs; see the file COPYING. If not, write to |
| 23 | ;;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
| 24 | |
| 25 | ;;; Commentary: |
| 26 | |
| 27 | ;;; This file makes the active region be pending delete, meaning that |
| 28 | ;;; text inserted while the region is active will replace the region contents. |
| 29 | ;;; This is a popular behavior of personal computers text editors. |
| 30 | |
| 31 | ;;; Code: |
| 32 | |
| 33 | (defvar delete-selection-mode t |
| 34 | "*Non-nil means Delete Selection mode is enabled. |
| 35 | In Delete Selection mode, when a region is highlighted, |
| 36 | insertion commands first delete the region and then insert.") |
| 37 | |
| 38 | (defun delete-active-region (&optional killp) |
| 39 | (if killp |
| 40 | (kill-region (point) (mark)) |
| 41 | (delete-region (point) (mark))) |
| 42 | (setq mark-active nil) |
| 43 | (run-hooks 'deactivate-mark-hook) |
| 44 | t) |
| 45 | |
| 46 | (defun delete-selection-pre-hook () |
| 47 | (if (and delete-selection-mode |
| 48 | (not buffer-read-only) |
| 49 | transient-mark-mode mark-active) |
| 50 | (let ((type (and (symbolp this-command) |
| 51 | (get this-command 'delete-selection)))) |
| 52 | (cond ((eq type 'kill) |
| 53 | (delete-active-region t)) |
| 54 | ((eq type 'supersede) |
| 55 | (if (delete-active-region nil) |
| 56 | (setq this-command '(lambda () (interactive))))) |
| 57 | (type |
| 58 | (delete-active-region nil)))))) |
| 59 | |
| 60 | (add-hook 'pre-command-hook 'delete-selection-pre-hook) |
| 61 | |
| 62 | (put 'self-insert-command 'delete-selection t) |
| 63 | |
| 64 | (put 'yank 'delete-selection t) |
| 65 | (put 'insert-register 'delete-selection t) |
| 66 | |
| 67 | (put 'delete-backward-char 'delete-selection 'supersede) |
| 68 | (put 'backward-delete-char-untabify 'delete-selection 'supersede) |
| 69 | (put 'delete-char 'delete-selection 'supersede) |
| 70 | |
| 71 | (put 'newline-and-indent 'delete-selection 't) |
| 72 | (put 'newline 'delete-selection t) |
| 73 | (put 'open-line 'delete-selection t) |
| 74 | |
| 75 | ;;;###autoload |
| 76 | (defalias 'pending-delete-mode 'delete-selection-mode) |
| 77 | ;;;###autoload |
| 78 | (defun delete-selection-mode (arg) |
| 79 | "Toggle Delete Selection mode. |
| 80 | When ON, typed text replaces the selection if the selection is active. |
| 81 | When OFF, typed text is just inserted at point." |
| 82 | (interactive "P") |
| 83 | (setq delete-selection-mode |
| 84 | (if (null arg) (not delete-selection-mode) |
| 85 | (> (prefix-numeric-value arg) 0))) |
| 86 | (set-buffer-modified-p (buffer-modified-p))) ;No-op, but updates mode line. |
| 87 | |
| 88 | ;; This is very useful for cancelling a selection in the minibuffer without |
| 89 | ;; aborting the minibuffer. |
| 90 | (defun minibuffer-keyboard-quit () |
| 91 | "Abort recursive edit. |
| 92 | In Delete Selection mode mode, if the mark is active, just deactivate it; |
| 93 | then it takes a second C-g to abort the minibuffer." |
| 94 | (interactive) |
| 95 | (if (and delete-selection-mode transient-mark-mode mark-active) |
| 96 | (setq deactivate-mark t) |
| 97 | (abort-recursive-edit))) |
| 98 | |
| 99 | (define-key minibuffer-local-map "\C-g" 'minibuffer-keyboard-quit) |
| 100 | (define-key minibuffer-local-ns-map "\C-g" 'minibuffer-keyboard-quit) |
| 101 | (define-key minibuffer-local-completion-map "\C-g" 'minibuffer-keyboard-quit) |
| 102 | (define-key minibuffer-local-must-match-map "\C-g" 'minibuffer-keyboard-quit) |
| 103 | (define-key minibuffer-local-isearch-map "\C-g" 'minibuffer-keyboard-quit) |
| 104 | |
| 105 | (provide 'delsel) |
| 106 | |
| 107 | ;;; delsel.el ends here |