X-Git-Url: https://code.delx.au/gnu-emacs/blobdiff_plain/e983096bb6a50fdae6625cb363642bcd74ec39c5..1bd74554970450054c874dbb69837b43f783c6bd:/lisp/delsel.el diff --git a/lisp/delsel.el b/lisp/delsel.el index b1f1151c22..da4223f49f 100644 --- a/lisp/delsel.el +++ b/lisp/delsel.el @@ -1,19 +1,19 @@ -;;; delsel.el --- delete selection if you insert +;;; delsel.el --- delete selection if you insert -*- lexical-binding:t -*- -;; Copyright (C) 1992, 1997, 1998, 2001, 2002, 2003, 2004, -;; 2005, 2006, 2007, 2008 Free Software Foundation, Inc. +;; Copyright (C) 1992, 1997-1998, 2001-2016 Free Software Foundation, +;; Inc. ;; Author: Matthieu Devin -;; Maintainer: FSF +;; Maintainer: emacs-devel@gnu.org ;; Created: 14 Jul 92 ;; Keywords: convenience emulations ;; This file is part of GNU Emacs. -;; GNU Emacs is free software; you can redistribute it and/or modify +;; GNU Emacs is free software: you can redistribute it and/or modify ;; it under the terms of the GNU General Public License as published by -;; the Free Software Foundation; either version 3, or (at your option) -;; any later version. +;; the Free Software Foundation, either version 3 of the License, or +;; (at your option) any later version. ;; GNU Emacs is distributed in the hope that it will be useful, ;; but WITHOUT ANY WARRANTY; without even the implied warranty of @@ -21,9 +21,7 @@ ;; GNU General Public License for more details. ;; You should have received a copy of the GNU General Public License -;; along with GNU Emacs; see the file COPYING. If not, write to the -;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, -;; Boston, MA 02110-1301, USA. +;; along with GNU Emacs. If not, see . ;;; Commentary: @@ -37,123 +35,259 @@ ;; 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 +;; deleted isn't immediately yanked back, which would make the +;; command a no-op. +;; `supersede' ;; Delete the active region and ignore the current command, -;; i.e. the command will just delete the region. -;; 'kill +;; i.e. the command will just delete the region. This is for +;; commands that normally delete small amounts of text, like +;; a single character -- they will instead delete the whole +;; active 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 +;; t ;; The normal case: delete the active region prior to executing ;; the command which will insert replacement text. +;; FUNCTION +;; For commands which need to dynamically determine this behavior. +;; FUNCTION should take no argument and return one of the above +;; values, or nil. In the latter case, FUNCTION should itself +;; do with the active region whatever is appropriate." ;;; 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) ;;;###autoload (define-minor-mode delete-selection-mode "Toggle Delete Selection mode. -With prefix ARG, turn Delete Selection mode on if ARG is -positive, off if ARG is not positive. +With a prefix argument ARG, enable Delete Selection mode if ARG +is positive, and disable it otherwise. If called from Lisp, +enable the mode if ARG is omitted or nil. + +When Delete Selection mode is enabled, typed text replaces the selection +if the selection is active. Otherwise, typed text is just inserted at +point regardless of any selection. Also, commands that normally delete +just one character will delete the entire selection instead. -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." +See `delete-selection-helper' and `delete-selection-pre-hook' for +information on adapting behavior of commands in Delete Selection mode." :global t :group 'editing-basics (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))) + (add-hook 'pre-command-hook 'delete-selection-pre-hook))) + +(defvar delsel--replace-text-or-position nil) (defun delete-active-region (&optional killp) - (if killp - (kill-region (point) (mark)) - (delete-region (point) (mark))) - t) + "Delete the active region. +If KILLP in not-nil, the active region is killed instead of deleted." + (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: + `yank' + For commands which do a yank; ensures the region about to be + deleted isn't immediately yanked back, which would make the + command a no-op. + `supersede' + Delete the active region and ignore the current command, + i.e. the command will just delete the region. This is for + commands that normally delete small amounts of text, like + a single character -- they will instead delete the whole + active region. + `kill' + `kill-region' is used on the selection, rather than + `delete-region'. (Text selected with the mouse will + typically be yankable anyhow.) + FUNCTION + For commands which need to dynamically determine this + behavior. FUNCTION should take no argument and return a + value acceptable as TYPE, or nil. In the latter case, + FUNCTION should itself do with the active region whatever is + appropriate. + Other non-nil values + The normal case: delete the active region prior to executing + the command which will insert replacement text." + (condition-case data + (cond ((eq type 'kill) ;Deprecated, backward compatibility. + (delete-active-region t) + (if (and overwrite-mode + (eq this-command 'self-insert-command)) + (let ((overwrite-mode nil)) + (self-insert-command + (prefix-numeric-value current-prefix-arg)) + (setq this-command 'ignore)))) + ((eq type 'yank) + ;; Before a yank command, make sure we don't yank the + ;; head of the kill-ring that really comes from the + ;; currently active region we are going to delete. + ;; That would make yank a no-op. + (when (and (string= (buffer-substring-no-properties + (point) (mark)) + (car kill-ring)) + (fboundp 'mouse-region-match) + (mouse-region-match)) + (current-kill 1)) + (let ((pos (copy-marker (region-beginning)))) + (delete-active-region) + ;; If the region was, say, rectangular, make sure we yank + ;; from the top, to "replace". + (goto-char pos))) + ((eq type 'supersede) + (let ((empty-region (= (point) (mark)))) + (delete-active-region) + (unless empty-region + (setq this-command 'ignore)))) + ((functionp type) (delete-selection-helper (funcall type))) + (type + (delete-active-region) + (if (and overwrite-mode + (eq this-command 'self-insert-command)) + (let ((overwrite-mode nil)) + (self-insert-command + (prefix-numeric-value current-prefix-arg)) + (setq this-command 'ignore))))) + ;; If ask-user-about-supersession-threat signals an error, + ;; stop safe_run_hooks from clearing out pre-command-hook. + (file-supersession (message "%s" (cadr data)) (ding)) + (text-read-only + ;; This signal may come either from `delete-active-region' or + ;; `self-insert-command' (when `overwrite-mode' is non-nil). + ;; To avoid clearing out `pre-command-hook' we handle this case + ;; by issuing a simple message. Note, however, that we do not + ;; handle all related problems: When read-only text ends before + ;; the end of the region, the latter is not deleted but any + ;; subsequent insertion will succeed. We could avoid this case + ;; by doing a (setq this-command 'ignore) here. This would, + ;; however, still not handle the case where read-only text ends + ;; precisely where the region starts: In that case the deletion + ;; would succeed but the subsequent insertion would fail with a + ;; text-read-only error. To handle that case we would have to + ;; investigate text properties at both ends of the region and + ;; skip the deletion when inserting text is forbidden there. + (message "Text is read-only") (ding)))) (defun delete-selection-pre-hook () - (when (and delete-selection-mode transient-mark-mode mark-active + "Function run before commands that delete selections are executed. +Commands which will delete the selection need a `delete-selection' +property on their symbol; commands which insert text but don't +have this property won't delete the selection. +See `delete-selection-helper'." + (when (and delete-selection-mode (use-region-p) (not buffer-read-only)) - (let ((type (and (symbolp this-command) - (get this-command 'delete-selection)))) - (condition-case data - (cond ((eq type 'kill) - (delete-active-region t)) - ((eq type 'yank) - ;; Before a yank command, make sure we don't yank the - ;; head of the kill-ring that really comes from the - ;; currently active region we are going to delete. - ;; That would make yank a no-op. - (when (and (string= (buffer-substring-no-properties (point) (mark)) - (car kill-ring)) - (fboundp 'mouse-region-match) - (mouse-region-match)) - (current-kill 1)) - (delete-active-region)) - ((eq type 'supersede) - (let ((empty-region (= (point) (mark)))) - (delete-active-region) - (unless empty-region - (setq this-command 'ignore)))) - (type - (delete-active-region) - (if (and overwrite-mode (eq this-command 'self-insert-command)) - (let ((overwrite-mode nil)) - (self-insert-command (prefix-numeric-value current-prefix-arg)) - (setq this-command 'ignore))))) - (file-supersession - ;; If ask-user-about-supersession-threat signals an error, - ;; stop safe_run_hooks from clearing out pre-command-hook. - (and (eq inhibit-quit 'pre-command-hook) - (setq inhibit-quit 'delete-selection-dummy)) - (signal 'file-supersession (cdr data))) - (text-read-only - ;; This signal may come either from `delete-active-region' or - ;; `self-insert-command' (when `overwrite-mode' is non-nil). - ;; To avoid clearing out `pre-command-hook' we handle this case - ;; by issuing a simple message. Note, however, that we do not - ;; handle all related problems: When read-only text ends before - ;; the end of the region, the latter is not deleted but any - ;; subsequent insertion will succeed. We could avoid this case - ;; by doing a (setq this-command 'ignore) here. This would, - ;; however, still not handle the case where read-only text ends - ;; precisely where the region starts: In that case the deletion - ;; would succeed but the subsequent insertion would fail with a - ;; text-read-only error. To handle that case we would have to - ;; investigate text properties at both ends of the region and - ;; skip the deletion when inserting text is forbidden there. - (message "Text is read-only") (ding)))))) - -(put 'self-insert-command 'delete-selection t) -(put 'self-insert-iso 'delete-selection t) + (delete-selection-helper (and (symbolp this-command) + (get this-command 'delete-selection))))) + +(defun delete-selection-uses-region-p () + "Return t when the current command will be using the region +rather than having `delete-selection' delete it, nil otherwise. + +This function is intended for use as the value of the +`delete-selection' property of a command, and shouldn't be used +for anything else." + (not (run-hook-with-args-until-success + 'self-insert-uses-region-functions))) + +(put 'self-insert-command 'delete-selection 'delete-selection-uses-region-p) + +(put 'insert-char 'delete-selection t) +(put 'quoted-insert 'delete-selection t) (put 'yank 'delete-selection 'yank) (put 'clipboard-yank 'delete-selection 'yank) (put 'insert-register 'delete-selection t) - -(put 'delete-backward-char 'delete-selection 'supersede) -(put 'backward-delete-char-untabify 'delete-selection 'supersede) +;; 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 cancelling a selection in the minibuffer without +;; This is very useful for canceling a selection in the minibuffer without ;; aborting the minibuffer. (defun minibuffer-keyboard-quit () "Abort recursive edit. 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) + (if (and delete-selection-mode (region-active-p)) (setq deactivate-mark t) (abort-recursive-edit))) @@ -170,14 +304,13 @@ then it takes a second \\[keyboard-quit] to abort the minibuffer." (define-key minibuffer-local-completion-map "\C-g" 'abort-recursive-edit) (define-key minibuffer-local-must-match-map "\C-g" 'abort-recursive-edit) (define-key minibuffer-local-isearch-map "\C-g" 'abort-recursive-edit) - (dolist (sym '(self-insert-command self-insert-iso yank clipboard-yank - insert-register delete-backward-char backward-delete-char-untabify - delete-char newline-and-indent newline open-line)) + (dolist (sym '(self-insert-command insert-char quoted-insert yank + clipboard-yank insert-register newline-and-indent + reindent-then-newline-and-indent newline open-line)) (put sym 'delete-selection nil)) ;; continue standard unloading nil) (provide 'delsel) -;; arch-tag: 1e388890-1b50-4ed0-9347-763b1343b6ed ;;; delsel.el ends here