-;;; delsel.el --- delete selection if you insert
+;;; delsel.el --- delete selection if you insert -*- lexical-binding:t -*-
-;; Copyright (C) 1992, 1997-1998, 2001-2014 Free Software Foundation,
+;; Copyright (C) 1992, 1997-1998, 2001-2015 Free Software Foundation,
;; Inc.
;; Author: Matthieu Devin <devin@lucid.com>
-;; Maintainer: FSF
+;; Maintainer: emacs-devel@gnu.org
;; Created: 14 Jul 92
;; Keywords: convenience emulations
;; property on their symbols; commands which insert text but don't
;; have this property won't delete the selection. It can be one of
;; the values:
-;; 'yank
+;; `yank'
;; For commands which do a yank; ensures the region about to be
;; deleted isn't yanked.
-;; 'supersede
+;; `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.)
;; t
;; The normal case: delete the active region prior to executing
;; the command which will insert replacement text.
;;; Code:
+(defvar delete-selection-save-to-register nil
+ "If non-nil, deleted region text is stored in this register.
+Value must be the register (key) to use.")
+
;;;###autoload
(defalias 'pending-delete-mode 'delete-selection-mode)
(remove-hook 'pre-command-hook 'delete-selection-pre-hook)
(add-hook 'pre-command-hook 'delete-selection-pre-hook)))
+(defvar delsel--replace-text-or-position nil)
+
(defun delete-active-region (&optional killp)
"Delete the active region.
If KILLP in not-nil, the active region is killed instead of deleted."
- (if killp
- ;; Don't allow `kill-region' to change the value of `this-command'.
- (let (this-command)
- (kill-region (point) (mark) t))
- (funcall region-extract-function 'delete-only))
- t)
+ (cond
+ (killp
+ ;; Don't allow `kill-region' to change the value of `this-command'.
+ (let (this-command)
+ (kill-region (point) (mark) t)))
+ (delete-selection-save-to-register
+ (set-register delete-selection-save-to-register
+ (funcall region-extract-function t))
+ (setq delsel--replace-text-or-position
+ (cons (current-buffer)
+ (and (consp buffer-undo-list) (car buffer-undo-list)))))
+ (t
+ (funcall region-extract-function 'delete-only))))
+
+(defun delete-selection-repeat-replace-region (arg)
+ "Repeat replacing text of highlighted region with typed text.
+Search for the next stretch of text identical to the region last replaced
+by typing text over it and replaces it with the same stretch of text.
+With ARG, repeat that many times. `C-u' means until end of buffer."
+ (interactive "P")
+ (let ((old-text (and delete-selection-save-to-register
+ (get-register delete-selection-save-to-register)))
+ (count (if (consp arg) (point-max)
+ (prefix-numeric-value current-prefix-arg))))
+ (if (not (and old-text
+ (> (length old-text) 0)
+ (or (stringp delsel--replace-text-or-position)
+ (buffer-live-p (car delsel--replace-text-or-position)))))
+ (message "No known previous replacement")
+ ;; If this is the first use after overwriting regions,
+ ;; find the replacement text by looking at the undo list.
+ (when (consp delsel--replace-text-or-position)
+ (let ((buffer (car delsel--replace-text-or-position))
+ (elt (cdr delsel--replace-text-or-position)))
+ (setq delsel--replace-text-or-position nil)
+ (with-current-buffer buffer
+ (save-restriction
+ (widen)
+ ;; Find the text that replaced the region via the undo list.
+ (let ((ul buffer-undo-list) u s e)
+ (when elt
+ (while (consp ul)
+ (setq u (car ul) ul (cdr ul))
+ (cond
+ ((eq u elt) ;; got it
+ (setq ul nil))
+ ((and (consp u) (integerp (car u)) (integerp (cdr u)))
+ (if (and s (= (cdr u) s))
+ (setq s (car u))
+ (setq s (car u) e (cdr u)))))))
+ (cond ((and s e (<= s e) (= s (mark t)))
+ (setq delsel--replace-text-or-position
+ (filter-buffer-substring s e))
+ (set-text-properties
+ 0 (length delsel--replace-text-or-position)
+ nil delsel--replace-text-or-position))
+ ((and (null s) (eq u elt)) ;; Nothing inserted.
+ (setq delsel--replace-text-or-position ""))
+ (t
+ (message "Cannot locate replacement text"))))))))
+ (while (and (> count 0)
+ delsel--replace-text-or-position
+ (search-forward old-text nil t))
+ (replace-match delsel--replace-text-or-position nil t)
+ (setq count (1- count))))))
(defun delete-selection-helper (type)
"Delete selection according to TYPE:
For commands which need to dynamically determine this behavior.
FUNCTION should take no argument and return one of the above values or nil."
(condition-case data
- (cond ((eq type 'kill)
+ (cond ((eq type 'kill) ;Deprecated, backward compatibility.
(delete-active-region t)
(if (and overwrite-mode
(eq this-command 'self-insert-command))
(put 'yank 'delete-selection 'yank)
(put 'clipboard-yank 'delete-selection 'yank)
(put 'insert-register 'delete-selection t)
+;; delete-backward-char and delete-forward-char already delete the selection by
+;; default, but not delete-char.
+(put 'delete-char 'delete-selection 'supersede)
(put 'reindent-then-newline-and-indent 'delete-selection t)
(put 'newline-and-indent 'delete-selection t)
(put 'newline 'delete-selection t)
-(put 'open-line 'delete-selection 'kill)
+(put 'electric-newline-and-maybe-indent 'delete-selection t)
+(put 'open-line 'delete-selection t)
;; This is very useful for canceling a selection in the minibuffer without
;; aborting the minibuffer.