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120 lines
4.1 KiB
EmacsLisp
120 lines
4.1 KiB
EmacsLisp
;;; pending-del.el --- pending delete selection
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;;; Copyright (C) 1992 Free Software Foundation, Inc.
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;; Author: Matthieu Devin <devin@lucid.com>
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;; Created: 14 Jul 92
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;; Last change 18-Feb-93, devin.
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;;; This file is part of GNU Emacs.
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;;; GNU Emacs is free software; you can redistribute it and/or modify
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;;; it under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 2, or (at your option)
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;;; any later version.
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;;; GNU Emacs is distributed in the hope that it will be useful,
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;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Emacs; see the file COPYING. If not, write to
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;;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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;;; Commentary:
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;;; This file makes the active region be pending delete, meaning that
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;;; text inserted while the region is active will replace the region contents.
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;;; This is a popular behavior of personal computers text editors.
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;;; Code:
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(defvar pending-delete-mode t
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"*Non-nil means Pending Delete mode is enabled.
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In Pending Delete mode, when a region is highlighted,
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insertion commands first delete the region and then insert.")
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(defun delete-active-region (&optional killp)
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(if killp
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(kill-region (point) (mark))
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(delete-region (point) (mark)))
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(setq mark-active nil)
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(run-hooks 'deactivate-mark-hook)
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t)
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(defun pending-delete-pre-hook ()
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(if (and pending-delete-mode
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(not buffer-read-only)
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transient-mark-mode mark-active)
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(let ((type (and (symbolp this-command)
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(get this-command 'pending-delete))))
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(cond ((eq type 'kill)
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(delete-active-region t))
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((eq type 'supersede)
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(if (delete-active-region ())
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(setq this-command '(lambda () (interactive)))))
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(type
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(delete-active-region ()))))))
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(add-hook 'pre-command-hook 'pending-delete-pre-hook)
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(put 'self-insert-command 'pending-delete t)
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(put 'yank 'pending-delete t)
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(put 'x-yank-clipboard-selection 'pending-delete t)
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(put 'delete-backward-char 'pending-delete 'supersede)
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(put 'backward-delete-char-untabify 'pending-delete 'supersede)
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(put 'delete-char 'pending-delete 'supersede)
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(put 'newline-and-indent 'pending-delete 't)
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(put 'newline 'pending-delete t)
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(put 'open-line 'pending-delete t)
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(defun pending-delete-mode (arg)
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"Toggle the state of pending-delete mode.
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When ON, typed text replaces the selection if the selection is active.
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When OFF, typed text is just inserted at point."
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(interactive "P")
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(setq pending-delete-mode
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(if (null arg) (not pending-delete-mode)
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(> (prefix-numeric-value arg) 0)))
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(set-buffer-modified-p (buffer-modified-p))) ;No-op, but updates mode line.
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;; This new definition of control-G makes the first control-G disown the
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;; selection and the second one signal a QUIT.
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;; This is very useful for cancelling a selection in the minibuffer without
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;; aborting the minibuffer.
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;; It has actually nothing to do with pending-delete but its more necessary
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;; with pending delete because pending delete users use the selection more.
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(defun keyboard-quit ()
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"Signal a `quit' condition.
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During execution of Lisp code, this character causes a quit directly.
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At top-level, as an editor command, this simply beeps.
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In Transient Mark mode, if the mark is active, just deactivate it."
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(interactive)
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(if (and transient-mark-mode mark-active)
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(progn
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;; Don't beep if just deactivating the region.
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(setq mark-active nil)
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(run-hooks 'deactivate-mark-hook))
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(signal 'quit nil)))
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(defun minibuffer-keyboard-quit ()
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"Abort recursive edit.
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In Transient Mark mode, if the mark is active, just deactivate it."
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(interactive)
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(if (and transient-mark-mode mark-active)
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(progn
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;; Don't beep if just deactivating the region.
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(setq mark-active nil)
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(run-hooks 'deactivate-mark-hook))
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(abort-recursive-edit)))
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(define-key minibuffer-local-map "\C-g" 'minibuffer-keyboard-quit)
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(provide 'pending-del)
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;;; pending-del.el ends here
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