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- ;; pending-del.el --- Making insertions replace any selected text.
-
- ;; Copyright (C) 1992, 1994 Free Software Foundation, Inc.
-
- ;; Author: Matthieu Devin <devin@lucid.com>, 14 Jul 92.
-
- ;; This file is part of XEmacs.
-
- ;; XEmacs 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.
-
- ;; XEmacs 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 XEmacs; see the file COPYING. If not, write to the Free
- ;; Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
-
- ;;; Code:
-
- (defvar pending-delete-verbose
- 1
- "*nil disables on/off messages for pending-del mode
- 1 suppresses messages on loading
- t enables all messages")
-
- (defun delete-active-region (&optional killp)
- (if (and (not buffer-read-only)
- (extentp zmacs-region-extent)
- (eq (current-buffer) (extent-buffer zmacs-region-extent))
- (extent-start-position zmacs-region-extent)
- (<= (extent-start-position zmacs-region-extent) (point))
- (<= (point) (extent-end-position zmacs-region-extent)))
- (progn
- (if killp
- (kill-region (extent-start-position zmacs-region-extent)
- (extent-end-position zmacs-region-extent))
- (delete-region (extent-start-position zmacs-region-extent)
- (extent-end-position zmacs-region-extent)))
- (zmacs-deactivate-region)
- t)))
-
- (defun pending-delete-pre-hook ()
- (let ((type (and (symbolp this-command)
- (get this-command 'pending-delete))))
- (cond ((eq type 'kill)
- (delete-active-region t))
- ((eq type 'supersede)
- (if (delete-active-region ())
- (setq this-command '(lambda () (interactive)))))
- (type
- (delete-active-region ())))))
-
- (put 'self-insert-command 'pending-delete t)
-
- (put 'yank 'pending-delete t)
- (put 'x-yank-clipboard-selection 'pending-delete t)
-
- (put 'delete-backward-char 'pending-delete 'supersede)
- (put 'backward-delete-char-untabify 'pending-delete 'supersede)
- (put 'delete-char 'pending-delete 'supersede)
- (put 'c-electric-delete 'pending-delete 'supersede)
-
- ;; Don't delete for these. They're more problematic than helpful.
- ;;
- ;; (put 'newline-and-indent 'pending-delete t)
- ;; (put 'newline 'pending-delete t)
- ;; (put 'open-line 'pending-delete t)
-
- (put 'insert-register 'pending-delete t)
-
- ;;;###autoload
- (defun pending-delete-on (verbose)
- "Turn on pending delete.
- When it is ON, typed text replaces the selection if the selection is active.
- When it is OFF, typed text is just inserted at point."
- (interactive "P")
- (add-hook 'pre-command-hook 'pending-delete-pre-hook)
- (and verbose
- (message "Pending delete is ON, use M-x pending-delete to turn it OFF")))
-
- ;;;###autoload
- (defun pending-delete-off (verbose)
- "Turn off pending delete.
- When it is ON, typed text replaces the selection if the selection is active.
- When it is OFF, typed text is just inserted at point."
- (interactive "P")
- (remove-hook 'pre-command-hook 'pending-delete-pre-hook)
- (and verbose (message "pending delete is OFF")))
-
- ;;;###autoload
- (defun pending-delete (&optional arg)
- "Toggle automatic deletion of the selected region.
- With a positive argument, turns it on.
- With a non-positive argument, turns it off.
- When active, typed text replaces the selection."
- (interactive "P")
- (let* ((was-on (not (not (memq 'pending-delete-pre-hook pre-command-hook))))
- (on-p (if (null arg)
- (not was-on)
- (> (prefix-numeric-value arg) 0))))
- (cond ((eq on-p was-on)
- nil)
- (on-p
- (pending-delete-on pending-delete-verbose))
- (t
- (pending-delete-off pending-delete-verbose)))))
-
- ;; Add pending-del mode. Assume that if we load it then we obviously wanted
- ;; it on, even if it is already on.
- (pending-delete-on (eq pending-delete-verbose t))
-
- (provide 'pending-del)
-
- ;;; pending-del.el ends here
-