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fc429cfe RS |
1 | ;;; double.el - Support for keyboard remapping with double clicking. |
2 | ||
70d949ea | 3 | ;; Copyright (C) 1994 Free Software Foundation, Inc. |
fc429cfe RS |
4 | |
5 | ;; Author: Per Abrahamsen <abraham@iesd.auc.dk> | |
fc429cfe | 6 | ;; Keywords: i18n |
fc429cfe | 7 | |
70d949ea RS |
8 | ;; This file is part of GNU Emacs. |
9 | ||
10 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
fc429cfe RS |
11 | ;; it under the terms of the GNU General Public License as published by |
12 | ;; the Free Software Foundation; either version 2, or (at your option) | |
13 | ;; any later version. | |
70d949ea RS |
14 | |
15 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
fc429cfe RS |
16 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of |
17 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | ;; GNU General Public License for more details. | |
70d949ea | 19 | |
fc429cfe | 20 | ;; You should have received a copy of the GNU General Public License |
70d949ea RS |
21 | ;; along with GNU Emacs; see the file COPYING. If not, write to |
22 | ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
fc429cfe RS |
23 | |
24 | ;;; Commentary: | |
25 | ||
26 | ;; This mode is intended for use with languages that adds a small | |
27 | ;; number of extra letters not available on the keyboard. | |
28 | ;; | |
29 | ;; Examples includes Scandinavian and German with an US keyboard. | |
30 | ;; | |
31 | ;; The idea is that certain keys are overloaded. When you press it | |
32 | ;; once it will insert one string, and when you press it twice the | |
33 | ;; string will be replaced by another. This can be used for mapping | |
34 | ;; keys on a US keyboard to generate characters according to the local | |
35 | ;; keyboard convention when pressed once, and according to US keyboard | |
36 | ;; convetion when pressed twice. | |
37 | ;; | |
38 | ;; To use this mode, you must define the variable `double-map' and | |
39 | ;; then enable double mode with `M-x double-mode'. Read the | |
40 | ;; documentation for both of them. | |
41 | ;; | |
42 | ;; The default mapping is for getting Danish/Norwegian keyboard layout | |
43 | ;; using ISO Latin 1 on a US keyboard. | |
44 | ;; | |
45 | ;; Requires FSF Emacs 19.20 or later. | |
46 | ;; | |
47 | ;; Imprtant node: While I would like to hear comments, bug reports, | |
48 | ;; suggestions, please do @strong{not} expect me to put other mappings | |
49 | ;; that the default into this file. There are billions and billions | |
50 | ;; of such mappings, and just supporting the most common would | |
51 | ;; increase the size of this nice small file manyfold. | |
52 | ||
53 | ;;; ChangeLog: | |
54 | ||
5867a409 RS |
55 | ;; * 1994-06-21 Per Abrahamsen |
56 | ;; Added `double-prefix-only'. | |
57 | ;; * 1994-02-28 Per Abrahamsen | |
58 | ;; Use 127 instead of 'delete to delete a character. | |
fc429cfe RS |
59 | ;; * 1994-02-03 Per Abrahamsen |
60 | ;; Created. | |
61 | ||
62 | ;;; Code: | |
63 | ||
64 | (defvar double-map | |
65 | '((?\; "\346" ";") | |
66 | (?\' "\370" "'") | |
67 | (?\[ "\345" "[") | |
68 | (?\: "\306" ":") | |
69 | (?\" "\330" "\"") | |
70 | (?\{ "\305" "{")) | |
71 | "Alist of key translations activated by double mode. | |
72 | ||
73 | Each entry is a list with three elements: | |
74 | 1. The key activating the translation. | |
75 | 2. The string to be inserted when the key is pressed once. | |
76 | 3. The string to be inserted when the key is pressed twice.") | |
77 | ||
5867a409 RS |
78 | (defvar double-prefix-only t |
79 | "*Non-nil means that double mode mapping only works for prefix keys. | |
80 | That is, for any key `X' in `double-map', `X' alone will be mapped | |
81 | but not `C-u X' or `ESC X' since the X is not the prefix key.") | |
82 | ||
fc429cfe RS |
83 | ;;; Read Event |
84 | ||
85 | (defvar double-last-event nil) | |
86 | ;; The last key that generated a double key event. | |
87 | ||
88 | (defun double-read-event (prompt) | |
89 | ;; Read an event | |
90 | (if isearch-mode (isearch-update)) | |
91 | (if prompt | |
92 | (prog2 (message "%s%c" prompt double-last-event) | |
93 | (read-event) | |
94 | (message "")) | |
95 | (read-event))) | |
96 | ||
f55e5c6b | 97 | (global-set-key [ignore] '(lambda () (interactive))) |
fc429cfe RS |
98 | |
99 | (or (boundp 'isearch-mode-map) | |
100 | (load-library "isearch")) | |
101 | ||
f55e5c6b | 102 | (define-key isearch-mode-map [ignore] |
fc429cfe RS |
103 | (function (lambda () (interactive) (isearch-update)))) |
104 | ||
105 | (defun double-translate-key (prompt) | |
106 | ;; Translate input events using double map. | |
107 | (let ((key last-input-char)) | |
108 | (cond (unread-command-events | |
109 | ;; Artificial event, ignore it. | |
110 | (vector key)) | |
5867a409 RS |
111 | ((and double-prefix-only |
112 | (> (length (this-command-keys)) 1)) | |
113 | ;; This is not a prefix key, ignore it. | |
114 | (vector key)) | |
fc429cfe RS |
115 | ((eq key 'magic-start) |
116 | ;; End of generated event. See if he will repeat it... | |
117 | (let ((new (double-read-event prompt)) | |
118 | (entry (assoc double-last-event double-map))) | |
119 | (if (eq new double-last-event) | |
120 | (progn | |
121 | (setq unread-command-events | |
122 | (append (make-list (1- (length (nth 1 entry))) | |
f55e5c6b | 123 | 127) |
fc429cfe RS |
124 | (nth 2 entry) |
125 | '(magic-end))) | |
126 | (vector 127)) | |
127 | (setq unread-command-events (list new)) | |
f55e5c6b | 128 | [ignore]))) |
fc429cfe RS |
129 | ((eq key 'magic-end) |
130 | ;; End of double event. Ignore. | |
f55e5c6b | 131 | [ignore]) |
fc429cfe RS |
132 | (t |
133 | ;; New key. | |
134 | (let ((exp (nth 1 (assoc key double-map)))) | |
135 | (setq double-last-event key) | |
136 | (setq unread-command-events | |
137 | (append (substring exp 1) '(magic-start))) | |
138 | (vector (aref exp 0))))))) | |
139 | ||
140 | ;;; Key Translation Map | |
141 | ||
142 | (defvar default-key-translation-map | |
143 | (or key-translation-map (make-sparse-keymap)) | |
144 | "Key translation you want to have effect, regardless of double mode. | |
145 | This will default to the value of `key-translation-map' when double was | |
146 | first loaded.") | |
147 | ||
148 | (make-variable-buffer-local 'key-translation-map) | |
149 | ||
150 | (defun double-setup () | |
151 | ;; Setup key-translation-map as indicated by `double-map'. | |
152 | (setq key-translation-map (copy-keymap default-key-translation-map)) | |
153 | (mapcar (function (lambda (entry) | |
154 | (define-key key-translation-map (vector (nth 0 entry)) | |
155 | 'double-translate-key))) | |
156 | (append double-map '((magic-start) (magic-end))))) | |
157 | ||
158 | ;;; Mode | |
159 | ||
160 | (defvar double-mode nil) | |
161 | ;; Indicator for the double mode. | |
162 | (make-variable-buffer-local 'double-mode) | |
163 | ||
164 | (or (assq 'double-mode minor-mode-alist) | |
165 | (setq minor-mode-alist | |
166 | (cons '(double-mode (" " double-mode-name)) minor-mode-alist))) | |
167 | ||
168 | (defvar double-mode-name "Double") | |
169 | ;; Name of current double mode. | |
170 | (make-variable-buffer-local 'double-mode-name) | |
171 | ||
172 | ;;;###autoload | |
173 | (defun double-mode (arg) | |
174 | "Toggle double mode. | |
175 | With prefix arg, turn double mode on iff arg is positive. | |
176 | ||
177 | When double mode is on, some keys will insert will insert different | |
178 | strings when pressed twice. See variable `double-map' for details." | |
179 | (interactive "P") | |
180 | (if (or (and (null arg) double-mode) | |
181 | (<= (prefix-numeric-value arg) 0)) | |
182 | ;; Turn it off | |
183 | (if double-mode | |
184 | (progn | |
185 | (let ((double-map)) | |
186 | (double-setup)) | |
187 | (setq double-mode nil) | |
188 | (set-buffer-modified-p (buffer-modified-p)))) | |
189 | ;;Turn it on | |
190 | (if double-mode | |
191 | () | |
192 | (double-setup) | |
193 | (setq double-mode t) | |
194 | (set-buffer-modified-p (buffer-modified-p))))) | |
195 | ||
196 | (provide 'double) | |
197 | ||
198 | ;;; double.el ends here | |
199 |