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181 lines
7.1 KiB
EmacsLisp
181 lines
7.1 KiB
EmacsLisp
;;; delsel.el --- delete selection if you insert
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;; Copyright (C) 1992, 1997-1998, 2001-2012 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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;; Keywords: convenience emulations
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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 3 of the License, or
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;; (at your option) 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. If not, see <http://www.gnu.org/licenses/>.
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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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;; Interface:
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;; Commands which will delete the selection need a 'delete-selection
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;; property on their symbols; commands which insert text but don't
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;; have this property won't delete the selection. It can be one of
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;; the values:
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;; 'yank
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;; For commands which do a yank; ensures the region about to be
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;; deleted isn't yanked.
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;; 'supersede
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;; Delete the active region and ignore the current command,
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;; i.e. the command will just delete the region.
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;; 'kill
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;; `kill-region' is used on the selection, rather than
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;; `delete-region'. (Text selected with the mouse will typically
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;; be yankable anyhow.)
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;; non-nil
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;; The normal case: delete the active region prior to executing
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;; the command which will insert replacement text.
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;;; Code:
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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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(define-minor-mode delete-selection-mode
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"Toggle Delete Selection mode.
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With a prefix argument ARG, enable Delete Selection mode if ARG
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is positive, and disable it otherwise. If called from Lisp,
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enable the mode if ARG is omitted or nil.
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When Delete Selection mode is enabled, Transient Mark mode is also
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enabled and typed text replaces the selection if the selection is
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active. Otherwise, typed text is just inserted at point regardless of
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any selection."
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:global t :group 'editing-basics
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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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(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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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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(condition-case data
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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, make sure we don't yank the
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;; head of the kill-ring that really comes from the
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;; currently active region we are going to delete.
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;; That would make yank a no-op.
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(when (and (string= (buffer-substring-no-properties (point) (mark))
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(car kill-ring))
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(fboundp 'mouse-region-match)
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(mouse-region-match))
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(current-kill 1))
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(delete-active-region))
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((eq type 'supersede)
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(let ((empty-region (= (point) (mark))))
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(delete-active-region)
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(unless empty-region
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(setq this-command 'ignore))))
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(type
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(delete-active-region)
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(if (and overwrite-mode (eq this-command 'self-insert-command))
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(let ((overwrite-mode nil))
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(self-insert-command (prefix-numeric-value current-prefix-arg))
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(setq this-command 'ignore)))))
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(file-supersession
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;; If ask-user-about-supersession-threat signals an error,
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;; stop safe_run_hooks from clearing out pre-command-hook.
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(and (eq inhibit-quit 'pre-command-hook)
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(setq inhibit-quit 'delete-selection-dummy))
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(signal 'file-supersession (cdr data)))
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(text-read-only
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;; This signal may come either from `delete-active-region' or
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;; `self-insert-command' (when `overwrite-mode' is non-nil).
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;; To avoid clearing out `pre-command-hook' we handle this case
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;; by issuing a simple message. Note, however, that we do not
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;; handle all related problems: When read-only text ends before
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;; the end of the region, the latter is not deleted but any
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;; subsequent insertion will succeed. We could avoid this case
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;; by doing a (setq this-command 'ignore) here. This would,
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;; however, still not handle the case where read-only text ends
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;; precisely where the region starts: In that case the deletion
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;; would succeed but the subsequent insertion would fail with a
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;; text-read-only error. To handle that case we would have to
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;; investigate text properties at both ends of the region and
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;; skip the deletion when inserting text is forbidden there.
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(message "Text is read-only") (ding))))))
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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 'kill)
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;; This is very useful for canceling 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, if the mark is active, just deactivate it;
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then it takes a second \\[keyboard-quit] 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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(defun delsel-unload-function ()
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"Unload the Delete Selection library."
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(define-key minibuffer-local-map "\C-g" 'abort-recursive-edit)
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(define-key minibuffer-local-ns-map "\C-g" 'abort-recursive-edit)
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(define-key minibuffer-local-completion-map "\C-g" 'abort-recursive-edit)
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(define-key minibuffer-local-must-match-map "\C-g" 'abort-recursive-edit)
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(define-key minibuffer-local-isearch-map "\C-g" 'abort-recursive-edit)
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(dolist (sym '(self-insert-command self-insert-iso yank clipboard-yank
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insert-register delete-backward-char backward-delete-char-untabify
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delete-char newline-and-indent newline open-line))
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(put sym 'delete-selection nil))
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;; continue standard unloading
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nil)
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(provide 'delsel)
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;;; delsel.el ends here
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