;; pending-del.el --- Making insertions replace any selected text.
;; Copyright (C) 1992, 1994 Free Software Foundation, Inc.
;; Author: Matthieu Devin <firstname.lastname@example.org>, 14 Jul 92.
;; Maintainer: Hrvoje Niksic <email@example.com>
;; Version 2.2
;; 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, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;;; Synched up with: 19.34 (distributed as delsel.el in FSF)
;; Much of this code was revamped by Hrvoje Niksic, July 1997, with
;; version number set to 2.x.
;; Pending-del is now a minor mode, with all the normal toggle
;; functions. It should be somewhat faster, too.
(defcustom pending-delete-mode nil
"Non-nil when Pending Delete mode is enabled. In Pending Delete mode, typed
text replaces the selected region. Normally, you shouldn't modify this
variable by hand, but use the function `pending-delete-mode' instead. However,
you can customize the default value from the options menu (auto delete
:set (lambda (symbol value)
(pending-delete-mode (or value 0)))
(defcustom pending-delete-modeline-string " PenDel"
"*String to display in the modeline when Pending Delete mode is active."
(add-minor-mode 'pending-delete-mode 'pending-delete-modeline-string)
(defun pending-delete-active-region (&optional killp)
(when (and (region-active-p)
(eq (extent-object (car zmacs-region-extent))
(eq (extent-object zmacs-region-extent) (current-buffer)))
;; Here we used to check whether the point lies between the
;; beginning and end of the extent. I don't see how it is
;; necessary, as the C code makes sure that this is so; it only
;; slow things down.
(kill-rectangle (region-beginning) (region-end))
(delete-rectangle (region-beginning) (region-end)))
(kill-region (region-beginning) (region-end))
(delete-region (region-beginning) (region-end))))
(defun pending-delete-pre-hook ()
(let ((type (and (symbolp this-command)
(get this-command 'pending-delete))))
(cond ((eq type 'kill)
((eq type 'supersede)
(if (pending-delete-active-region ())
(setq this-command (lambda () (interactive)))))
(warn "Error caught in `pending-delete-pre-hook': %s"
(put 'self-insert-command 'pending-delete t)
(put 'yank 'pending-delete t)
(put 'yank-rectangle 'pending-delete t)
(put 'yank-clipboard-selection 'pending-delete t)
(put 'x-yank-clipboard-selection 'pending-delete t)
(put 'toolbar-paste '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)
;; Support the XEmacs 20.3 'delete functions
(put 'backward-or-forward-delete-char 'pending-delete 'supersede)
(put 'cperl-electric-backspace 'pending-delete 'supersede)
(put 'cperl-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)
(defun turn-on-pending-delete (&optional ignored)
"Turn on pending delete minor mode unconditionally."
(defun turn-off-pending-delete (&optional ignored)
"Turn off pending delete minor mode unconditionally."
(defun pending-delete-mode (&optional arg)
"Toggle Pending Delete minor mode.
When the pending delete is on, typed text replaces the selection.
With a positive argument, turns it on.
With a non-positive argument, turns it off."
(if (null arg) (not pending-delete-mode)
(> (prefix-numeric-value arg) 0)))
(add-hook 'pre-command-hook 'pending-delete-pre-hook)
(remove-hook 'pre-command-hook 'pending-delete-pre-hook))
;; Backward compatibility:
(define-obsolete-function-alias 'pending-delete-on 'turn-on-pending-delete)
(define-obsolete-function-alias 'pending-delete-off 'turn-off-pending-delete)
;; FSF compatibility:
(define-compatible-function-alias 'delete-selection-mode 'pending-delete-mode)
;; Compatibility and convenience:
(defalias 'pending-delete 'pending-delete-mode)
;; The following code used to turn the mode on unconditionally.
;; However, this is a very bad idea -- since pending-del is
;; autoloaded, (turn-on-pending-delete) is as easy to add to `.emacs'
;; as (require 'pending-del) used to be.
;(pending-delete-on (eq pending-delete-verbose t))
;;; pending-del.el ends here