1;;; delsel.el --- delete selection if you insert 2 3;; Copyright (C) 1992, 1997, 1998, 2001, 2002, 2003, 2004, 4;; 2005, 2006, 2007 Free Software Foundation, Inc. 5 6;; Author: Matthieu Devin <devin@lucid.com> 7;; Maintainer: FSF 8;; Created: 14 Jul 92 9;; Keywords: convenience emulations 10 11;; This file is part of GNU Emacs. 12 13;; GNU Emacs is free software; you can redistribute it and/or modify 14;; it under the terms of the GNU General Public License as published by 15;; the Free Software Foundation; either version 2, or (at your option) 16;; any later version. 17 18;; GNU Emacs is distributed in the hope that it will be useful, 19;; but WITHOUT ANY WARRANTY; without even the implied warranty of 20;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 21;; GNU General Public License for more details. 22 23;; You should have received a copy of the GNU General Public License 24;; along with GNU Emacs; see the file COPYING. If not, write to the 25;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 26;; Boston, MA 02110-1301, USA. 27 28;;; Commentary: 29 30;; This file makes the active region be pending delete, meaning that 31;; text inserted while the region is active will replace the region contents. 32;; This is a popular behavior of personal computers text editors. 33 34;; Interface: 35 36;; Commands which will delete the selection need a 'delete-selection 37;; property on their symbols; commands which insert text but don't 38;; have this property won't delete the selction. It can be one of 39;; the values: 40;; 'yank 41;; For commands which do a yank; ensures the region about to be 42;; deleted isn't yanked. 43;; 'supersede 44;; Delete the active region and ignore the current command, 45;; i.e. the command will just delete the region. 46;; 'kill 47;; `kill-region' is used on the selection, rather than 48;; `delete-region'. (Text selected with the mouse will typically 49;; be yankable anyhow.) 50;; non-nil 51;; The normal case: delete the active region prior to executing 52;; the command which will insert replacement text. 53 54;;; Code: 55 56;;;###autoload 57(defalias 'pending-delete-mode 'delete-selection-mode) 58 59;;;###autoload 60(define-minor-mode delete-selection-mode 61 "Toggle Delete Selection mode. 62With prefix ARG, turn Delete Selection mode on if and only if ARG is 63positive. 64 65When Delete Selection mode is enabled, Transient Mark mode is also 66enabled and typed text replaces the selection if the selection is 67active. Otherwise, typed text is just inserted at point regardless of 68any selection." 69 :global t :group 'editing-basics 70 (if (not delete-selection-mode) 71 (remove-hook 'pre-command-hook 'delete-selection-pre-hook) 72 (add-hook 'pre-command-hook 'delete-selection-pre-hook) 73 (transient-mark-mode t))) 74 75(defun delete-active-region (&optional killp) 76 (if killp 77 (kill-region (point) (mark)) 78 (delete-region (point) (mark))) 79 t) 80 81(defun delete-selection-pre-hook () 82 (when (and delete-selection-mode transient-mark-mode mark-active 83 (not buffer-read-only)) 84 (let ((type (and (symbolp this-command) 85 (get this-command 'delete-selection)))) 86 (condition-case data 87 (cond ((eq type 'kill) 88 (delete-active-region t)) 89 ((eq type 'yank) 90 ;; Before a yank command, 91 ;; make sure we don't yank the same region 92 ;; that we are going to delete. 93 ;; That would make yank a no-op. 94 (when (string= (buffer-substring-no-properties (point) (mark)) 95 (car kill-ring)) 96 (current-kill 1)) 97 (delete-active-region)) 98 ((eq type 'supersede) 99 (let ((empty-region (= (point) (mark)))) 100 (delete-active-region) 101 (unless empty-region 102 (setq this-command 'ignore)))) 103 (type 104 (delete-active-region) 105 (if (and overwrite-mode (eq this-command 'self-insert-command)) 106 (let ((overwrite-mode nil)) 107 (self-insert-command (prefix-numeric-value current-prefix-arg)) 108 (setq this-command 'ignore))))) 109 (file-supersession 110 ;; If ask-user-about-supersession-threat signals an error, 111 ;; stop safe_run_hooks from clearing out pre-command-hook. 112 (and (eq inhibit-quit 'pre-command-hook) 113 (setq inhibit-quit 'delete-selection-dummy)) 114 (signal 'file-supersession (cdr data))))))) 115 116(put 'self-insert-command 'delete-selection t) 117(put 'self-insert-iso 'delete-selection t) 118 119(put 'yank 'delete-selection 'yank) 120(put 'clipboard-yank 'delete-selection 'yank) 121(put 'insert-register 'delete-selection t) 122 123(put 'delete-backward-char 'delete-selection 'supersede) 124(put 'backward-delete-char-untabify 'delete-selection 'supersede) 125(put 'delete-char 'delete-selection 'supersede) 126 127(put 'newline-and-indent 'delete-selection t) 128(put 'newline 'delete-selection t) 129(put 'open-line 'delete-selection 'kill) 130 131;; This is very useful for cancelling a selection in the minibuffer without 132;; aborting the minibuffer. 133(defun minibuffer-keyboard-quit () 134 "Abort recursive edit. 135In Delete Selection mode, if the mark is active, just deactivate it; 136then it takes a second \\[keyboard-quit] to abort the minibuffer." 137 (interactive) 138 (if (and delete-selection-mode transient-mark-mode mark-active) 139 (setq deactivate-mark t) 140 (abort-recursive-edit))) 141 142(define-key minibuffer-local-map "\C-g" 'minibuffer-keyboard-quit) 143(define-key minibuffer-local-ns-map "\C-g" 'minibuffer-keyboard-quit) 144(define-key minibuffer-local-completion-map "\C-g" 'minibuffer-keyboard-quit) 145(define-key minibuffer-local-must-match-map "\C-g" 'minibuffer-keyboard-quit) 146(define-key minibuffer-local-isearch-map "\C-g" 'minibuffer-keyboard-quit) 147 148(defun delsel-unload-hook () 149 (define-key minibuffer-local-map "\C-g" 'abort-recursive-edit) 150 (define-key minibuffer-local-ns-map "\C-g" 'abort-recursive-edit) 151 (define-key minibuffer-local-completion-map "\C-g" 'abort-recursive-edit) 152 (define-key minibuffer-local-must-match-map "\C-g" 'abort-recursive-edit) 153 (define-key minibuffer-local-isearch-map "\C-g" 'abort-recursive-edit)) 154 155(add-hook 'delsel-unload-hook 'delsel-unload-hook) 156 157(provide 'delsel) 158 159;;; arch-tag: 1e388890-1b50-4ed0-9347-763b1343b6ed 160;;; delsel.el ends here 161