home *** CD-ROM | disk | FTP | other *** search
- ;;; delsel.el --- delete selection if you insert
-
- ;;; Copyright (C) 1992 Free Software Foundation, Inc.
-
- ;; Author: Matthieu Devin <devin@lucid.com>
- ;; Created: 14 Jul 92
- ;; Last change 18-Feb-93, devin.
-
- ;;; This file is part of GNU Emacs.
-
- ;;; GNU Emacs 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 2, or (at your option)
- ;;; any later version.
-
- ;;; GNU Emacs 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, 675 Mass Ave, Cambridge, MA 02139, USA.
-
- ;;; Commentary:
-
- ;;; This file makes the active region be pending delete, meaning that
- ;;; text inserted while the region is active will replace the region contents.
- ;;; This is a popular behavior of personal computers text editors.
-
- ;;; Code:
-
- (defvar delete-selection-mode t
- "*Non-nil means Delete Selection mode is enabled.
- In Delete Selection mode, when a region is highlighted,
- insertion commands first delete the region and then insert.")
-
- (defun delete-active-region (&optional killp)
- (if killp
- (kill-region (point) (mark))
- (delete-region (point) (mark)))
- (setq mark-active nil)
- (run-hooks 'deactivate-mark-hook)
- t)
-
- (defun delete-selection-pre-hook ()
- (if (and delete-selection-mode
- (not buffer-read-only)
- transient-mark-mode mark-active)
- (let ((type (and (symbolp this-command)
- (get this-command 'delete-selection))))
- (cond ((eq type 'kill)
- (delete-active-region t))
- ((eq type 'supersede)
- (if (delete-active-region nil)
- (setq this-command '(lambda () (interactive)))))
- (type
- (delete-active-region nil))))))
-
- (add-hook 'pre-command-hook 'delete-selection-pre-hook)
-
- (put 'self-insert-command 'delete-selection t)
-
- (put 'yank 'delete-selection t)
- (put 'insert-register 'delete-selection t)
-
- (put 'delete-backward-char 'delete-selection 'supersede)
- (put 'backward-delete-char-untabify 'delete-selection 'supersede)
- (put 'delete-char 'delete-selection 'supersede)
-
- (put 'newline-and-indent 'delete-selection 't)
- (put 'newline 'delete-selection t)
- (put 'open-line 'delete-selection t)
-
- ;;;###autoload
- (defalias 'pending-delete-mode 'delete-selection-mode)
- ;;;###autoload
- (defun delete-selection-mode (arg)
- "Toggle Delete Selection mode.
- When ON, typed text replaces the selection if the selection is active.
- When OFF, typed text is just inserted at point."
- (interactive "P")
- (setq delete-selection-mode
- (if (null arg) (not delete-selection-mode)
- (> (prefix-numeric-value arg) 0)))
- (set-buffer-modified-p (buffer-modified-p))) ;No-op, but updates mode line.
-
- ;; This is very useful for cancelling a selection in the minibuffer without
- ;; aborting the minibuffer.
- (defun minibuffer-keyboard-quit ()
- "Abort recursive edit.
- In Delete Selection mode mode, if the mark is active, just deactivate it;
- then it takes a second C-g to abort the minibuffer."
- (interactive)
- (if (and delete-selection-mode transient-mark-mode mark-active)
- (setq deactivate-mark t)
- (abort-recursive-edit)))
-
- (define-key minibuffer-local-map "\C-g" 'minibuffer-keyboard-quit)
- (define-key minibuffer-local-ns-map "\C-g" 'minibuffer-keyboard-quit)
- (define-key minibuffer-local-completion-map "\C-g" 'minibuffer-keyboard-quit)
- (define-key minibuffer-local-must-match-map "\C-g" 'minibuffer-keyboard-quit)
- (define-key minibuffer-local-isearch-map "\C-g" 'minibuffer-keyboard-quit)
-
- (provide 'delsel)
-
- ;;; delsel.el ends here
-