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141 lines
4.9 KiB
EmacsLisp
141 lines
4.9 KiB
EmacsLisp
;;; delsel.el --- delete selection if you insert
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;; Copyright (C) 1992, 1997 Free Software Foundation, Inc.
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;; Author: Matthieu Devin <devin@lucid.com>
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;; Maintainer: FSF
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;; Created: 14 Jul 92
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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 the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, 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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(eval-when-compile
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(require 'cl))
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;;;###autoload
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(defalias 'pending-delete-mode 'delete-selection-mode)
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;;;###autoload
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(defun delete-selection-mode (&optional arg)
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"Toggle Delete Selection mode.
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With prefix ARG, turn Delete Selection mode on if and only if ARG is positive.
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When Delete Selection mode is enabled, Transient Mark mode is also enabled and
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typed text replaces the selection if the selection is active. Otherwise, typed
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text is just inserted at point regardless of any selection."
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(interactive "P")
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(setq delete-selection-mode (if arg
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(> (prefix-numeric-value arg) 0)
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(not delete-selection-mode)))
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(if (not delete-selection-mode)
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(remove-hook 'pre-command-hook 'delete-selection-pre-hook)
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(add-hook 'pre-command-hook 'delete-selection-pre-hook)
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(transient-mark-mode t)))
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;;;###autoload
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(defcustom delete-selection-mode nil
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"Toggle Delete Selection mode.
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When Delete Selection mode is enabled, Transient Mark mode is also enabled and
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typed text replaces the selection if the selection is active.
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You must modify via \\[customize] for this variable to have an effect."
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:set (lambda (symbol value)
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(delete-selection-mode (or value 0)))
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:initialize 'custom-initialize-default
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:type 'boolean
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:group 'editing-basics
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:require 'delsel)
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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 delete-selection-pre-hook ()
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(when (and delete-selection-mode transient-mark-mode mark-active
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(not buffer-read-only))
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(let ((type (and (symbolp this-command)
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(get this-command 'delete-selection))))
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(cond ((eq type 'kill)
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(delete-active-region t))
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((eq type 'yank)
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;; Before a yank command,
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;; make sure we don't yank the same region
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;; that we are going to delete.
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;; That would make yank a no-op.
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(when (string= (buffer-substring-no-properties (point) (mark))
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(car kill-ring))
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(current-kill 1))
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(delete-active-region nil))
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((eq type 'supersede)
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(when (delete-active-region nil)
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(setq this-command '(lambda () (interactive)))))
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(type
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(delete-active-region nil))))))
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(put 'self-insert-command 'delete-selection t)
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(put 'self-insert-iso 'delete-selection t)
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(put 'yank 'delete-selection 'yank)
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(put 'clipboard-yank 'delete-selection 'yank)
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(put 'insert-register 'delete-selection t)
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(put 'delete-backward-char 'delete-selection 'supersede)
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(put 'backward-delete-char-untabify 'delete-selection 'supersede)
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(put 'delete-char 'delete-selection 'supersede)
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(put 'newline-and-indent 'delete-selection 't)
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(put 'newline 'delete-selection t)
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(put 'open-line 'delete-selection t)
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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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(defun minibuffer-keyboard-quit ()
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"Abort recursive edit.
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In Delete Selection mode mode, if the mark is active, just deactivate it;
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then it takes a second C-g to abort the minibuffer."
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(interactive)
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(if (and delete-selection-mode transient-mark-mode mark-active)
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(setq deactivate-mark t)
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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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(define-key minibuffer-local-ns-map "\C-g" 'minibuffer-keyboard-quit)
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(define-key minibuffer-local-completion-map "\C-g" 'minibuffer-keyboard-quit)
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(define-key minibuffer-local-must-match-map "\C-g" 'minibuffer-keyboard-quit)
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(define-key minibuffer-local-isearch-map "\C-g" 'minibuffer-keyboard-quit)
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(provide 'delsel)
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;; This is the standard way mechanism to put the mode into effect
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;; if delete-selection-mode has already been set to t
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;; when this file is loaded.
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(when delete-selection-mode
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(delete-selection-mode t))
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;;; delsel.el ends here
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