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28d3ed91 | 1 | ;;; delsel.el --- delete selection if you insert |
76550a57 | 2 | |
73b0cd50 | 3 | ;; Copyright (C) 1992, 1997-1998, 2001-2011 Free Software Foundation, Inc. |
76550a57 ER |
4 | |
5 | ;; Author: Matthieu Devin <devin@lucid.com> | |
4228277d | 6 | ;; Maintainer: FSF |
76550a57 | 7 | ;; Created: 14 Jul 92 |
f947a7fa | 8 | ;; Keywords: convenience emulations |
b0dbaa21 | 9 | |
b578f267 | 10 | ;; This file is part of GNU Emacs. |
b0dbaa21 | 11 | |
eb3fa2cf | 12 | ;; GNU Emacs is free software: you can redistribute it and/or modify |
b578f267 | 13 | ;; it under the terms of the GNU General Public License as published by |
eb3fa2cf GM |
14 | ;; the Free Software Foundation, either version 3 of the License, or |
15 | ;; (at your option) any later version. | |
b0dbaa21 | 16 | |
b578f267 EN |
17 | ;; GNU Emacs is distributed in the hope that it will be useful, |
18 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | ;; GNU General Public License for more details. | |
b0dbaa21 | 21 | |
b578f267 | 22 | ;; You should have received a copy of the GNU General Public License |
eb3fa2cf | 23 | ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. |
b0dbaa21 | 24 | |
76550a57 | 25 | ;;; Commentary: |
b0dbaa21 | 26 | |
b578f267 EN |
27 | ;; This file makes the active region be pending delete, meaning that |
28 | ;; text inserted while the region is active will replace the region contents. | |
29 | ;; This is a popular behavior of personal computers text editors. | |
b0dbaa21 | 30 | |
69b3c6c7 DL |
31 | ;; Interface: |
32 | ||
33 | ;; Commands which will delete the selection need a 'delete-selection | |
34 | ;; property on their symbols; commands which insert text but don't | |
c815b73f | 35 | ;; have this property won't delete the selection. It can be one of |
69b3c6c7 DL |
36 | ;; the values: |
37 | ;; 'yank | |
38 | ;; For commands which do a yank; ensures the region about to be | |
39 | ;; deleted isn't yanked. | |
40 | ;; 'supersede | |
41 | ;; Delete the active region and ignore the current command, | |
42 | ;; i.e. the command will just delete the region. | |
43 | ;; 'kill | |
44 | ;; `kill-region' is used on the selection, rather than | |
45 | ;; `delete-region'. (Text selected with the mouse will typically | |
46 | ;; be yankable anyhow.) | |
47 | ;; non-nil | |
48 | ;; The normal case: delete the active region prior to executing | |
49 | ;; the command which will insert replacement text. | |
76550a57 | 50 | |
69b3c6c7 | 51 | ;;; Code: |
7853929f SM |
52 | |
53 | ;;;###autoload | |
54 | (defalias 'pending-delete-mode 'delete-selection-mode) | |
55 | ||
56 | ;;;###autoload | |
ad03cafc | 57 | (define-minor-mode delete-selection-mode |
7853929f | 58 | "Toggle Delete Selection mode. |
f7fdcecd RS |
59 | With prefix ARG, turn Delete Selection mode on if ARG is |
60 | positive, off if ARG is not positive. | |
7853929f | 61 | |
69b3c6c7 DL |
62 | When Delete Selection mode is enabled, Transient Mark mode is also |
63 | enabled and typed text replaces the selection if the selection is | |
64 | active. Otherwise, typed text is just inserted at point regardless of | |
65 | any selection." | |
82fdafde | 66 | :global t :group 'editing-basics |
7853929f SM |
67 | (if (not delete-selection-mode) |
68 | (remove-hook 'pre-command-hook 'delete-selection-pre-hook) | |
69 | (add-hook 'pre-command-hook 'delete-selection-pre-hook) | |
70 | (transient-mark-mode t))) | |
71 | ||
b0dbaa21 | 72 | (defun delete-active-region (&optional killp) |
af9157b9 RS |
73 | (if killp |
74 | (kill-region (point) (mark)) | |
75 | (delete-region (point) (mark))) | |
af9157b9 | 76 | t) |
b0dbaa21 | 77 | |
28d3ed91 | 78 | (defun delete-selection-pre-hook () |
7853929f SM |
79 | (when (and delete-selection-mode transient-mark-mode mark-active |
80 | (not buffer-read-only)) | |
81 | (let ((type (and (symbolp this-command) | |
82 | (get this-command 'delete-selection)))) | |
f13e84fa RS |
83 | (condition-case data |
84 | (cond ((eq type 'kill) | |
85 | (delete-active-region t)) | |
86 | ((eq type 'yank) | |
195d88f4 JL |
87 | ;; Before a yank command, make sure we don't yank the |
88 | ;; head of the kill-ring that really comes from the | |
67755cc4 JL |
89 | ;; currently active region we are going to delete. |
90 | ;; That would make yank a no-op. | |
195d88f4 JL |
91 | (when (and (string= (buffer-substring-no-properties (point) (mark)) |
92 | (car kill-ring)) | |
614a773a | 93 | (fboundp 'mouse-region-match) |
67755cc4 | 94 | (mouse-region-match)) |
f13e84fa RS |
95 | (current-kill 1)) |
96 | (delete-active-region)) | |
97 | ((eq type 'supersede) | |
98 | (let ((empty-region (= (point) (mark)))) | |
99 | (delete-active-region) | |
100 | (unless empty-region | |
101 | (setq this-command 'ignore)))) | |
102 | (type | |
ec08e2f4 JL |
103 | (delete-active-region) |
104 | (if (and overwrite-mode (eq this-command 'self-insert-command)) | |
105 | (let ((overwrite-mode nil)) | |
106 | (self-insert-command (prefix-numeric-value current-prefix-arg)) | |
107 | (setq this-command 'ignore))))) | |
f13e84fa RS |
108 | (file-supersession |
109 | ;; If ask-user-about-supersession-threat signals an error, | |
110 | ;; stop safe_run_hooks from clearing out pre-command-hook. | |
111 | (and (eq inhibit-quit 'pre-command-hook) | |
112 | (setq inhibit-quit 'delete-selection-dummy)) | |
578877a1 MR |
113 | (signal 'file-supersession (cdr data))) |
114 | (text-read-only | |
115 | ;; This signal may come either from `delete-active-region' or | |
116 | ;; `self-insert-command' (when `overwrite-mode' is non-nil). | |
117 | ;; To avoid clearing out `pre-command-hook' we handle this case | |
118 | ;; by issuing a simple message. Note, however, that we do not | |
119 | ;; handle all related problems: When read-only text ends before | |
120 | ;; the end of the region, the latter is not deleted but any | |
121 | ;; subsequent insertion will succeed. We could avoid this case | |
122 | ;; by doing a (setq this-command 'ignore) here. This would, | |
123 | ;; however, still not handle the case where read-only text ends | |
124 | ;; precisely where the region starts: In that case the deletion | |
125 | ;; would succeed but the subsequent insertion would fail with a | |
126 | ;; text-read-only error. To handle that case we would have to | |
127 | ;; investigate text properties at both ends of the region and | |
128 | ;; skip the deletion when inserting text is forbidden there. | |
129 | (message "Text is read-only") (ding)))))) | |
b0dbaa21 | 130 | |
28d3ed91 | 131 | (put 'self-insert-command 'delete-selection t) |
cc5ac2c6 | 132 | (put 'self-insert-iso 'delete-selection t) |
b0dbaa21 | 133 | |
6b214411 | 134 | (put 'yank 'delete-selection 'yank) |
b708f0ad | 135 | (put 'clipboard-yank 'delete-selection 'yank) |
d4df3279 | 136 | (put 'insert-register 'delete-selection t) |
b0dbaa21 | 137 | |
28d3ed91 RS |
138 | (put 'delete-backward-char 'delete-selection 'supersede) |
139 | (put 'backward-delete-char-untabify 'delete-selection 'supersede) | |
140 | (put 'delete-char 'delete-selection 'supersede) | |
b0dbaa21 | 141 | |
69b3c6c7 | 142 | (put 'newline-and-indent 'delete-selection t) |
28d3ed91 | 143 | (put 'newline 'delete-selection t) |
69b3c6c7 DL |
144 | (put 'open-line 'delete-selection 'kill) |
145 | ||
23652376 | 146 | ;; This is very useful for cancelling a selection in the minibuffer without |
b0dbaa21 | 147 | ;; aborting the minibuffer. |
b0dbaa21 RS |
148 | (defun minibuffer-keyboard-quit () |
149 | "Abort recursive edit. | |
69b3c6c7 DL |
150 | In Delete Selection mode, if the mark is active, just deactivate it; |
151 | then it takes a second \\[keyboard-quit] to abort the minibuffer." | |
b0dbaa21 | 152 | (interactive) |
d4df3279 RS |
153 | (if (and delete-selection-mode transient-mark-mode mark-active) |
154 | (setq deactivate-mark t) | |
b0dbaa21 RS |
155 | (abort-recursive-edit))) |
156 | ||
23652376 DL |
157 | (define-key minibuffer-local-map "\C-g" 'minibuffer-keyboard-quit) |
158 | (define-key minibuffer-local-ns-map "\C-g" 'minibuffer-keyboard-quit) | |
159 | (define-key minibuffer-local-completion-map "\C-g" 'minibuffer-keyboard-quit) | |
160 | (define-key minibuffer-local-must-match-map "\C-g" 'minibuffer-keyboard-quit) | |
161 | (define-key minibuffer-local-isearch-map "\C-g" 'minibuffer-keyboard-quit) | |
162 | ||
c815b73f JB |
163 | (defun delsel-unload-function () |
164 | "Unload the Delete Selection library." | |
23652376 DL |
165 | (define-key minibuffer-local-map "\C-g" 'abort-recursive-edit) |
166 | (define-key minibuffer-local-ns-map "\C-g" 'abort-recursive-edit) | |
167 | (define-key minibuffer-local-completion-map "\C-g" 'abort-recursive-edit) | |
168 | (define-key minibuffer-local-must-match-map "\C-g" 'abort-recursive-edit) | |
c815b73f JB |
169 | (define-key minibuffer-local-isearch-map "\C-g" 'abort-recursive-edit) |
170 | (dolist (sym '(self-insert-command self-insert-iso yank clipboard-yank | |
171 | insert-register delete-backward-char backward-delete-char-untabify | |
172 | delete-char newline-and-indent newline open-line)) | |
8c8e1952 | 173 | (put sym 'delete-selection nil)) |
c815b73f JB |
174 | ;; continue standard unloading |
175 | nil) | |
87f14b12 | 176 | |
d4df3279 | 177 | (provide 'delsel) |
b0dbaa21 | 178 | |
d4df3279 | 179 | ;;; delsel.el ends here |