;;; delsel.el --- delete selection if you insert
-;; Copyright (C) 1992 Free Software Foundation, Inc.
+;; Copyright (C) 1992, 1997, 1998 Free Software Foundation, Inc.
;; Author: Matthieu Devin <devin@lucid.com>
;; Maintainer: FSF
;; Created: 14 Jul 92
-;; Last change 18-Feb-93, devin.
;; This file is part of GNU Emacs.
;; text inserted while the region is active will replace the region contents.
;; This is a popular behavior of personal computers text editors.
+;; Interface:
+
+;; Commands which will delete the selection need a 'delete-selection
+;; property on their symbols; commands which insert text but don't
+;; have this property won't delete the selction. It can be one of
+;; the values:
+;; 'yank
+;; For commands which do a yank; ensures the region about to be
+;; deleted isn't yanked.
+;; 'supersede
+;; Delete the active region and ignore the current command,
+;; i.e. the command will just delete the region.
+;; 'kill
+;; `kill-region' is used on the selection, rather than
+;; `delete-region'. (Text selected with the mouse will typically
+;; be yankable anyhow.)
+;; non-nil
+;; The normal case: delete the active region prior to executing
+;; the command which will insert replacement text.
+
;;; Code:
-(defvar delete-selection-mode t
- "*Non-nil means Delete Selection mode is enabled.
-In Delete Selection mode, when a region is highlighted,
-insertion commands first delete the region and then insert.")
+;;;###autoload
+(defalias 'pending-delete-mode 'delete-selection-mode)
+
+;;;###autoload
+(defun delete-selection-mode (&optional arg)
+ "Toggle Delete Selection mode.
+With prefix ARG, turn Delete Selection mode on if and only if ARG is
+positive.
+
+When Delete Selection mode is enabled, Transient Mark mode is also
+enabled and typed text replaces the selection if the selection is
+active. Otherwise, typed text is just inserted at point regardless of
+any selection."
+ (interactive "P")
+ (setq delete-selection-mode (if arg
+ (> (prefix-numeric-value arg) 0)
+ (not delete-selection-mode)))
+ (if (not delete-selection-mode)
+ (remove-hook 'pre-command-hook 'delete-selection-pre-hook)
+ (add-hook 'pre-command-hook 'delete-selection-pre-hook)
+ (transient-mark-mode t)))
+
+;;;###autoload
+(defcustom delete-selection-mode nil
+ "Toggle Delete Selection mode.
+See command `delete-selection-mode'.
+Setting this variable directly does not take effect;
+use either \\[customize] or the function `delete-selection-mode'."
+ :set (lambda (symbol value)
+ (delete-selection-mode (or value 0)))
+ :initialize 'custom-initialize-default
+ :type 'boolean
+ :group 'editing-basics
+ :require 'delsel)
(defun delete-active-region (&optional killp)
(if killp
t)
(defun delete-selection-pre-hook ()
- (if (and delete-selection-mode
- (not buffer-read-only)
- transient-mark-mode mark-active)
- (let ((type (and (symbolp this-command)
- (get this-command 'delete-selection))))
- (cond ((eq type 'kill)
- (delete-active-region t))
- ((eq type 'yank)
- ;; Before a yank command,
- ;; make sure we don't yank the same region
- ;; that we are going to delete.
- ;; That would make yank a no-op.
- (if (string= (buffer-substring (point) (mark))
+ (when (and delete-selection-mode transient-mark-mode mark-active
+ (not buffer-read-only))
+ (let ((type (and (symbolp this-command)
+ (get this-command 'delete-selection))))
+ (cond ((eq type 'kill)
+ (delete-active-region t))
+ ((eq type 'yank)
+ ;; Before a yank command,
+ ;; make sure we don't yank the same region
+ ;; that we are going to delete.
+ ;; That would make yank a no-op.
+ (when (string= (buffer-substring-no-properties (point) (mark))
(car kill-ring))
- (current-kill 1))
- (delete-active-region nil))
- ((eq type 'supersede)
- (if (delete-active-region nil)
- (setq this-command '(lambda () (interactive)))))
- (type
- (delete-active-region nil))))))
-
-(add-hook 'pre-command-hook 'delete-selection-pre-hook)
+ (current-kill 1))
+ (delete-active-region))
+ ((eq type 'supersede)
+ (delete-active-region)
+ (setq this-command 'ignore))
+ (type
+ (delete-active-region))))))
(put 'self-insert-command 'delete-selection t)
(put 'self-insert-iso 'delete-selection t)
(put 'backward-delete-char-untabify 'delete-selection 'supersede)
(put 'delete-char 'delete-selection 'supersede)
-(put 'newline-and-indent 'delete-selection 't)
+(put 'newline-and-indent 'delete-selection t)
(put 'newline 'delete-selection t)
-(put 'open-line 'delete-selection t)
+(put 'open-line 'delete-selection 'kill)
-;;;###autoload
-(defalias 'pending-delete-mode 'delete-selection-mode)
-;;;###autoload
-(defun delete-selection-mode (arg)
- "Toggle Delete Selection mode.
-When ON, typed text replaces the selection if the selection is active.
-When OFF, typed text is just inserted at point.
-
-A positive argument turns the mode on, negative argument turns it off,
-and no argument (or nil) toggles the mode."
- (interactive "P")
- (setq delete-selection-mode
- (if (null arg) (not delete-selection-mode)
- (> (prefix-numeric-value arg) 0)))
- (force-mode-line-update))
+(put 'insert-parentheses 'delete-selection t)
;; This is very useful for cancelling a selection in the minibuffer without
;; aborting the minibuffer.
(defun minibuffer-keyboard-quit ()
"Abort recursive edit.
-In Delete Selection mode mode, if the mark is active, just deactivate it;
-then it takes a second C-g to abort the minibuffer."
+In Delete Selection mode, if the mark is active, just deactivate it;
+then it takes a second \\[keyboard-quit] to abort the minibuffer."
(interactive)
(if (and delete-selection-mode transient-mark-mode mark-active)
(setq deactivate-mark t)
(provide 'delsel)
+;; This is the standard way mechanism to put the mode into effect
+;; if delete-selection-mode has already been set to t
+;; when this file is loaded.
+(when delete-selection-mode
+ (delete-selection-mode t))
+
;;; delsel.el ends here
HCoop / bpt / emacs.git / blobdiff