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;;; pending-del.el --- pending delete selection
;;; 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 pending-delete-mode t
"*Non-nil means Pending Delete mode is enabled.
In Pending Delete 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 pending-delete-pre-hook ()
(if (and pending-delete-mode
(not buffer-read-only)
transient-mark-mode mark-active)
(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 ()))))))
(add-hook 'pre-command-hook 'pending-delete-pre-hook)
(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 (arg)
"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 "P")
(setq pending-delete-mode
(if (null arg) (not pending-delete-mode)
(> (prefix-numeric-value arg) 0)))
(set-buffer-modified-p (buffer-modified-p))) ;No-op, but updates mode line.
;; 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.
During execution of Lisp code, this character causes a quit directly.
At top-level, as an editor command, 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)
;;; pending-del.el ends here
|
