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76550a57 ER |
1 | ;;; pending-del.el --- pending delete selection |
2 | ||
b0dbaa21 | 3 | ;;; Copyright (C) 1992 Free Software Foundation, Inc. |
76550a57 ER |
4 | |
5 | ;; Author: Matthieu Devin <devin@lucid.com> | |
6 | ;; Created: 14 Jul 92 | |
7 | ;; Last change 18-Feb-93, devin. | |
b0dbaa21 RS |
8 | |
9 | ;;; This file is part of GNU Emacs. | |
10 | ||
11 | ;;; GNU Emacs is free software; you can redistribute it and/or modify | |
12 | ;;; it under the terms of the GNU General Public License as published by | |
13 | ;;; the Free Software Foundation; either version 2, or (at your option) | |
14 | ;;; any later version. | |
15 | ||
16 | ;;; GNU Emacs is distributed in the hope that it will be useful, | |
17 | ;;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | ;;; GNU General Public License for more details. | |
20 | ||
21 | ;;; You should have received a copy of the GNU General Public License | |
22 | ;;; along with GNU Emacs; see the file COPYING. If not, write to | |
23 | ;;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
24 | ||
76550a57 | 25 | ;;; Commentary: |
b0dbaa21 | 26 | |
76550a57 | 27 | ;;; This file makes the active region be pending delete, meaning that |
b0dbaa21 RS |
28 | ;;; text inserted while the region is active will replace the region contents. |
29 | ;;; This is a popular behavior of personal computers text editors. | |
30 | ||
76550a57 ER |
31 | ;;; Code: |
32 | ||
af9157b9 RS |
33 | (defvar pending-delete-mode t |
34 | "*Non-nil means Pending Delete mode is enabled. | |
35 | In Pending Delete mode, when a region is highlighted, | |
36 | insertion commands first delete the region and then insert.") | |
37 | ||
b0dbaa21 | 38 | (defun delete-active-region (&optional killp) |
af9157b9 RS |
39 | (if killp |
40 | (kill-region (point) (mark)) | |
41 | (delete-region (point) (mark))) | |
42 | (setq mark-active nil) | |
43 | (run-hooks 'deactivate-mark-hook) | |
44 | t) | |
b0dbaa21 RS |
45 | |
46 | (defun pending-delete-pre-hook () | |
af9157b9 RS |
47 | (if (and pending-delete-mode |
48 | (not buffer-read-only) | |
49 | transient-mark-mode mark-active) | |
50 | (let ((type (and (symbolp this-command) | |
51 | (get this-command 'pending-delete)))) | |
52 | (cond ((eq type 'kill) | |
53 | (delete-active-region t)) | |
54 | ((eq type 'supersede) | |
55 | (if (delete-active-region ()) | |
56 | (setq this-command '(lambda () (interactive))))) | |
57 | (type | |
58 | (delete-active-region ())))))) | |
59 | ||
60 | (add-hook 'pre-command-hook 'pending-delete-pre-hook) | |
b0dbaa21 RS |
61 | |
62 | (put 'self-insert-command 'pending-delete t) | |
63 | ||
64 | (put 'yank 'pending-delete t) | |
65 | (put 'x-yank-clipboard-selection 'pending-delete t) | |
66 | ||
67 | (put 'delete-backward-char 'pending-delete 'supersede) | |
68 | (put 'backward-delete-char-untabify 'pending-delete 'supersede) | |
69 | (put 'delete-char 'pending-delete 'supersede) | |
70 | ||
71 | (put 'newline-and-indent 'pending-delete 't) | |
72 | (put 'newline 'pending-delete t) | |
73 | (put 'open-line 'pending-delete t) | |
74 | ||
af9157b9 | 75 | (defun pending-delete-mode (arg) |
b0dbaa21 RS |
76 | "Toggle the state of pending-delete mode. |
77 | When ON, typed text replaces the selection if the selection is active. | |
78 | When OFF, typed text is just inserted at point." | |
af9157b9 RS |
79 | (interactive "P") |
80 | (setq pending-delete-mode | |
81 | (if (null arg) (not pending-delete-mode) | |
82 | (> (prefix-numeric-value arg) 0))) | |
83 | (set-buffer-modified-p (buffer-modified-p))) ;No-op, but updates mode line. | |
b0dbaa21 RS |
84 | |
85 | ;; This new definition of control-G makes the first control-G disown the | |
86 | ;; selection and the second one signal a QUIT. | |
87 | ;; This is very useful for cancelling a selection in the minibuffer without | |
88 | ;; aborting the minibuffer. | |
89 | ;; It has actually nothing to do with pending-delete but its more necessary | |
90 | ;; with pending delete because pending delete users use the selection more. | |
91 | (defun keyboard-quit () | |
92 | "Signal a `quit' condition. | |
af9157b9 RS |
93 | During execution of Lisp code, this character causes a quit directly. |
94 | At top-level, as an editor command, this simply beeps. | |
b0dbaa21 RS |
95 | In Transient Mark mode, if the mark is active, just deactivate it." |
96 | (interactive) | |
97 | (if (and transient-mark-mode mark-active) | |
98 | (progn | |
99 | ;; Don't beep if just deactivating the region. | |
100 | (setq mark-active nil) | |
101 | (run-hooks 'deactivate-mark-hook)) | |
102 | (signal 'quit nil))) | |
103 | ||
104 | (defun minibuffer-keyboard-quit () | |
105 | "Abort recursive edit. | |
106 | In Transient Mark mode, if the mark is active, just deactivate it." | |
107 | (interactive) | |
108 | (if (and transient-mark-mode mark-active) | |
109 | (progn | |
110 | ;; Don't beep if just deactivating the region. | |
111 | (setq mark-active nil) | |
112 | (run-hooks 'deactivate-mark-hook)) | |
113 | (abort-recursive-edit))) | |
114 | ||
115 | (define-key minibuffer-local-map "\C-g" 'minibuffer-keyboard-quit) | |
116 | ||
117 | (provide 'pending-del) | |
118 | ||
76550a57 | 119 | ;;; pending-del.el ends here |