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+;;; Pending delete selection
+;;; Copyright (C) 1992 Free Software Foundation, Inc.
+;;; Created: 14 Jul 92, Matthieu Devin <devin@lucid.com>
+;;; 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.
+
+
+;;; This files 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.
+
+(defun delete-active-region (&optional killp)
+  (if (and (not buffer-read-only)
+	   (extentp primary-selection-extent)
+	   (eq (current-buffer) (extent-buffer primary-selection-extent))
+	   (< 0 (extent-start-position primary-selection-extent))
+	   (< 0 (extent-end-position primary-selection-extent)))
+      (progn
+	(if killp
+	    (kill-region (extent-start-position primary-selection-extent)
+			 (extent-end-position primary-selection-extent))
+	  (delete-region (extent-start-position primary-selection-extent)
+			 (extent-end-position primary-selection-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 'newline-and-indent 'pending-delete 't)
+(put 'newline 'pending-delete t)
+(put 'open-line 'pending-delete t)
+
+(defun pending-delete-mode ()
+  "Toggle the state of pending-delete mode.
+When ON, typed text replaces the selection if the selection is active.
+When OFF, typed text is just inserted at point."
+  (interactive)
+  (if (memq 'pending-delete-pre-hook pre-command-hook)
+      (progn
+	(remove-hook 'pre-command-hook 'pending-delete-pre-hook)
+	(message "pending delete is OFF"))
+    (progn
+      (add-hook 'pre-command-hook 'pending-delete-pre-hook)
+      (message
+       "Pending delete is ON, use M-x pending-delete to turn it OFF"))))
+
+(pending-delete-mode)
+
+;; This new definition of control-G makes the first control-G disown the 
+;; selection and the second one signal a QUIT.
+;; This is very useful for cancelling a selection in the minibuffer without 
+;; aborting the minibuffer.
+;; It has actually nothing to do with pending-delete but its more necessary
+;; with pending delete because pending delete users use the selection more.
+(defun keyboard-quit ()
+  "Signal a `quit' condition.
+If this character is typed while lisp code is executing, it will be treated
+ as an interrupt.
+If this character is typed at top-level, this simply beeps.
+
+In Transient Mark mode, if the mark is active, just deactivate it."
+  (interactive)
+  (if (and transient-mark-mode mark-active)
+      (progn
+	;; Don't beep if just deactivating the region.
+	(setq mark-active nil)
+	(run-hooks 'deactivate-mark-hook))
+    (signal 'quit nil)))
+
+(defun minibuffer-keyboard-quit ()
+  "Abort recursive edit.
+In Transient Mark mode, if the mark is active, just deactivate it."
+  (interactive)
+  (if (and transient-mark-mode mark-active)
+      (progn
+	;; Don't beep if just deactivating the region.
+	(setq mark-active nil)
+	(run-hooks 'deactivate-mark-hook))
+    (abort-recursive-edit)))
+
+(define-key minibuffer-local-map "\C-g" 'minibuffer-keyboard-quit) 
+
+(provide 'pending-del)
+
+;; End of pending-del.el.