| 1 | ;;; delsel.el --- delete selection if you insert |
| 2 | |
| 3 | ;; Copyright (C) 1992, 1997, 1998, 2001 Free Software Foundation, Inc. |
| 4 | |
| 5 | ;; Author: Matthieu Devin <devin@lucid.com> |
| 6 | ;; Maintainer: FSF |
| 7 | ;; Created: 14 Jul 92 |
| 8 | ;; Keywords: convenience emulations |
| 9 | |
| 10 | ;; This file is part of GNU Emacs. |
| 11 | |
| 12 | ;; GNU Emacs is free software; you can redistribute it and/or modify |
| 13 | ;; it under the terms of the GNU General Public License as published by |
| 14 | ;; the Free Software Foundation; either version 2, or (at your option) |
| 15 | ;; any later version. |
| 16 | |
| 17 | ;; GNU Emacs is distributed in the hope that it will be useful, |
| 18 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 20 | ;; GNU General Public License for more details. |
| 21 | |
| 22 | ;; You should have received a copy of the GNU General Public License |
| 23 | ;; along with GNU Emacs; see the file COPYING. If not, write to the |
| 24 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| 25 | ;; Boston, MA 02111-1307, USA. |
| 26 | |
| 27 | ;;; Commentary: |
| 28 | |
| 29 | ;; This file makes the active region be pending delete, meaning that |
| 30 | ;; text inserted while the region is active will replace the region contents. |
| 31 | ;; This is a popular behavior of personal computers text editors. |
| 32 | |
| 33 | ;; Interface: |
| 34 | |
| 35 | ;; Commands which will delete the selection need a 'delete-selection |
| 36 | ;; property on their symbols; commands which insert text but don't |
| 37 | ;; have this property won't delete the selction. It can be one of |
| 38 | ;; the values: |
| 39 | ;; 'yank |
| 40 | ;; For commands which do a yank; ensures the region about to be |
| 41 | ;; deleted isn't yanked. |
| 42 | ;; 'supersede |
| 43 | ;; Delete the active region and ignore the current command, |
| 44 | ;; i.e. the command will just delete the region. |
| 45 | ;; 'kill |
| 46 | ;; `kill-region' is used on the selection, rather than |
| 47 | ;; `delete-region'. (Text selected with the mouse will typically |
| 48 | ;; be yankable anyhow.) |
| 49 | ;; non-nil |
| 50 | ;; The normal case: delete the active region prior to executing |
| 51 | ;; the command which will insert replacement text. |
| 52 | |
| 53 | ;;; Code: |
| 54 | |
| 55 | ;;;###autoload |
| 56 | (defalias 'pending-delete-mode 'delete-selection-mode) |
| 57 | |
| 58 | ;;;###autoload |
| 59 | (define-minor-mode delete-selection-mode |
| 60 | "Toggle Delete Selection mode. |
| 61 | With prefix ARG, turn Delete Selection mode on if and only if ARG is |
| 62 | positive. |
| 63 | |
| 64 | When Delete Selection mode is enabled, Transient Mark mode is also |
| 65 | enabled and typed text replaces the selection if the selection is |
| 66 | active. Otherwise, typed text is just inserted at point regardless of |
| 67 | any selection." |
| 68 | :global t :group 'editing-basics |
| 69 | (if (not delete-selection-mode) |
| 70 | (remove-hook 'pre-command-hook 'delete-selection-pre-hook) |
| 71 | (add-hook 'pre-command-hook 'delete-selection-pre-hook) |
| 72 | (transient-mark-mode t))) |
| 73 | |
| 74 | (defun delete-active-region (&optional killp) |
| 75 | (if killp |
| 76 | (kill-region (point) (mark)) |
| 77 | (delete-region (point) (mark))) |
| 78 | t) |
| 79 | |
| 80 | (defun delete-selection-pre-hook () |
| 81 | (when (and delete-selection-mode transient-mark-mode mark-active |
| 82 | (not buffer-read-only)) |
| 83 | (let ((type (and (symbolp this-command) |
| 84 | (get this-command 'delete-selection)))) |
| 85 | (condition-case data |
| 86 | (cond ((eq type 'kill) |
| 87 | (delete-active-region t)) |
| 88 | ((eq type 'yank) |
| 89 | ;; Before a yank command, |
| 90 | ;; make sure we don't yank the same region |
| 91 | ;; that we are going to delete. |
| 92 | ;; That would make yank a no-op. |
| 93 | (when (string= (buffer-substring-no-properties (point) (mark)) |
| 94 | (car kill-ring)) |
| 95 | (current-kill 1)) |
| 96 | (delete-active-region)) |
| 97 | ((eq type 'supersede) |
| 98 | (let ((empty-region (= (point) (mark)))) |
| 99 | (delete-active-region) |
| 100 | (unless empty-region |
| 101 | (setq this-command 'ignore)))) |
| 102 | (type |
| 103 | (delete-active-region))) |
| 104 | (file-supersession |
| 105 | ;; If ask-user-about-supersession-threat signals an error, |
| 106 | ;; stop safe_run_hooks from clearing out pre-command-hook. |
| 107 | (and (eq inhibit-quit 'pre-command-hook) |
| 108 | (setq inhibit-quit 'delete-selection-dummy)) |
| 109 | (signal 'file-supersession (cdr data))))))) |
| 110 | |
| 111 | (put 'self-insert-command 'delete-selection t) |
| 112 | (put 'self-insert-iso 'delete-selection t) |
| 113 | |
| 114 | (put 'yank 'delete-selection 'yank) |
| 115 | (put 'clipboard-yank 'delete-selection 'yank) |
| 116 | (put 'insert-register 'delete-selection t) |
| 117 | |
| 118 | (put 'delete-backward-char 'delete-selection 'supersede) |
| 119 | (put 'backward-delete-char-untabify 'delete-selection 'supersede) |
| 120 | (put 'delete-char 'delete-selection 'supersede) |
| 121 | |
| 122 | (put 'newline-and-indent 'delete-selection t) |
| 123 | (put 'newline 'delete-selection t) |
| 124 | (put 'open-line 'delete-selection 'kill) |
| 125 | |
| 126 | ;; This is very useful for cancelling a selection in the minibuffer without |
| 127 | ;; aborting the minibuffer. |
| 128 | (defun minibuffer-keyboard-quit () |
| 129 | "Abort recursive edit. |
| 130 | In Delete Selection mode, if the mark is active, just deactivate it; |
| 131 | then it takes a second \\[keyboard-quit] to abort the minibuffer." |
| 132 | (interactive) |
| 133 | (if (and delete-selection-mode transient-mark-mode mark-active) |
| 134 | (setq deactivate-mark t) |
| 135 | (abort-recursive-edit))) |
| 136 | |
| 137 | (define-key minibuffer-local-map "\C-g" 'minibuffer-keyboard-quit) |
| 138 | (define-key minibuffer-local-ns-map "\C-g" 'minibuffer-keyboard-quit) |
| 139 | (define-key minibuffer-local-completion-map "\C-g" 'minibuffer-keyboard-quit) |
| 140 | (define-key minibuffer-local-must-match-map "\C-g" 'minibuffer-keyboard-quit) |
| 141 | (define-key minibuffer-local-isearch-map "\C-g" 'minibuffer-keyboard-quit) |
| 142 | |
| 143 | (defun delsel-unload-hook () |
| 144 | (define-key minibuffer-local-map "\C-g" 'abort-recursive-edit) |
| 145 | (define-key minibuffer-local-ns-map "\C-g" 'abort-recursive-edit) |
| 146 | (define-key minibuffer-local-completion-map "\C-g" 'abort-recursive-edit) |
| 147 | (define-key minibuffer-local-must-match-map "\C-g" 'abort-recursive-edit) |
| 148 | (define-key minibuffer-local-isearch-map "\C-g" 'abort-recursive-edit)) |
| 149 | |
| 150 | (provide 'delsel) |
| 151 | |
| 152 | ;;; arch-tag: 1e388890-1b50-4ed0-9347-763b1343b6ed |
| 153 | ;;; delsel.el ends here |