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be010748 | 1 | ;;; double.el --- Support for keyboard remapping with double clicking |
fc429cfe | 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 |
b578f267 EN |
21 | ;; along with GNU Emacs; see the file COPYING. If not, write to the |
22 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
23 | ;; Boston, MA 02111-1307, USA. | |
fc429cfe RS |
24 | |
25 | ;;; Commentary: | |
26 | ||
27 | ;; This mode is intended for use with languages that adds a small | |
28 | ;; number of extra letters not available on the keyboard. | |
29 | ;; | |
30 | ;; Examples includes Scandinavian and German with an US keyboard. | |
31 | ;; | |
32 | ;; The idea is that certain keys are overloaded. When you press it | |
33 | ;; once it will insert one string, and when you press it twice the | |
34 | ;; string will be replaced by another. This can be used for mapping | |
35 | ;; keys on a US keyboard to generate characters according to the local | |
36 | ;; keyboard convention when pressed once, and according to US keyboard | |
a7acbbe4 | 37 | ;; convention when pressed twice. |
fc429cfe RS |
38 | ;; |
39 | ;; To use this mode, you must define the variable `double-map' and | |
40 | ;; then enable double mode with `M-x double-mode'. Read the | |
41 | ;; documentation for both of them. | |
42 | ;; | |
43 | ;; The default mapping is for getting Danish/Norwegian keyboard layout | |
44 | ;; using ISO Latin 1 on a US keyboard. | |
45 | ;; | |
a7acbbe4 | 46 | ;; Important node: While I would like to hear comments, bug reports, |
fc429cfe | 47 | ;; suggestions, please do @strong{not} expect me to put other mappings |
a7acbbe4 | 48 | ;; than the default into this file. There are billions and billions |
fc429cfe RS |
49 | ;; of such mappings, and just supporting the most common would |
50 | ;; increase the size of this nice small file manyfold. | |
51 | ||
52 | ;;; ChangeLog: | |
53 | ||
5867a409 RS |
54 | ;; * 1994-06-21 Per Abrahamsen |
55 | ;; Added `double-prefix-only'. | |
56 | ;; * 1994-02-28 Per Abrahamsen | |
57 | ;; Use 127 instead of 'delete to delete a character. | |
fc429cfe RS |
58 | ;; * 1994-02-03 Per Abrahamsen |
59 | ;; Created. | |
60 | ||
61 | ;;; Code: | |
62 | ||
63 | (defvar double-map | |
64 | '((?\; "\346" ";") | |
65 | (?\' "\370" "'") | |
66 | (?\[ "\345" "[") | |
67 | (?\: "\306" ":") | |
68 | (?\" "\330" "\"") | |
69 | (?\{ "\305" "{")) | |
70 | "Alist of key translations activated by double mode. | |
71 | ||
72 | Each entry is a list with three elements: | |
73 | 1. The key activating the translation. | |
74 | 2. The string to be inserted when the key is pressed once. | |
75 | 3. The string to be inserted when the key is pressed twice.") | |
76 | ||
5867a409 | 77 | (defvar double-prefix-only t |
48a0ae63 | 78 | "*Non-nil means that Double mode mapping only works for prefix keys. |
5867a409 RS |
79 | That is, for any key `X' in `double-map', `X' alone will be mapped |
80 | but not `C-u X' or `ESC X' since the X is not the prefix key.") | |
81 | ||
fc429cfe RS |
82 | ;;; Read Event |
83 | ||
84 | (defvar double-last-event nil) | |
85 | ;; The last key that generated a double key event. | |
86 | ||
87 | (defun double-read-event (prompt) | |
88 | ;; Read an event | |
89 | (if isearch-mode (isearch-update)) | |
90 | (if prompt | |
91 | (prog2 (message "%s%c" prompt double-last-event) | |
92 | (read-event) | |
93 | (message "")) | |
94 | (read-event))) | |
95 | ||
f55e5c6b | 96 | (global-set-key [ignore] '(lambda () (interactive))) |
fc429cfe RS |
97 | |
98 | (or (boundp 'isearch-mode-map) | |
99 | (load-library "isearch")) | |
100 | ||
f55e5c6b | 101 | (define-key isearch-mode-map [ignore] |
fc429cfe RS |
102 | (function (lambda () (interactive) (isearch-update)))) |
103 | ||
104 | (defun double-translate-key (prompt) | |
105 | ;; Translate input events using double map. | |
106 | (let ((key last-input-char)) | |
107 | (cond (unread-command-events | |
108 | ;; Artificial event, ignore it. | |
109 | (vector key)) | |
5867a409 RS |
110 | ((and double-prefix-only |
111 | (> (length (this-command-keys)) 1)) | |
112 | ;; This is not a prefix key, ignore it. | |
113 | (vector key)) | |
fc429cfe RS |
114 | ((eq key 'magic-start) |
115 | ;; End of generated event. See if he will repeat it... | |
116 | (let ((new (double-read-event prompt)) | |
117 | (entry (assoc double-last-event double-map))) | |
118 | (if (eq new double-last-event) | |
119 | (progn | |
120 | (setq unread-command-events | |
121 | (append (make-list (1- (length (nth 1 entry))) | |
f55e5c6b | 122 | 127) |
fc429cfe RS |
123 | (nth 2 entry) |
124 | '(magic-end))) | |
125 | (vector 127)) | |
126 | (setq unread-command-events (list new)) | |
f55e5c6b | 127 | [ignore]))) |
fc429cfe RS |
128 | ((eq key 'magic-end) |
129 | ;; End of double event. Ignore. | |
f55e5c6b | 130 | [ignore]) |
fc429cfe RS |
131 | (t |
132 | ;; New key. | |
133 | (let ((exp (nth 1 (assoc key double-map)))) | |
134 | (setq double-last-event key) | |
135 | (setq unread-command-events | |
136 | (append (substring exp 1) '(magic-start))) | |
137 | (vector (aref exp 0))))))) | |
138 | ||
139 | ;;; Key Translation Map | |
140 | ||
141 | (defvar default-key-translation-map | |
142 | (or key-translation-map (make-sparse-keymap)) | |
48a0ae63 RS |
143 | "Key translation you want to have effect, regardless of Double mode. |
144 | This defaults to the value of `key-translation-map' when double was | |
fc429cfe RS |
145 | first loaded.") |
146 | ||
147 | (make-variable-buffer-local 'key-translation-map) | |
148 | ||
149 | (defun double-setup () | |
150 | ;; Setup key-translation-map as indicated by `double-map'. | |
151 | (setq key-translation-map (copy-keymap default-key-translation-map)) | |
152 | (mapcar (function (lambda (entry) | |
153 | (define-key key-translation-map (vector (nth 0 entry)) | |
154 | 'double-translate-key))) | |
155 | (append double-map '((magic-start) (magic-end))))) | |
156 | ||
157 | ;;; Mode | |
158 | ||
159 | (defvar double-mode nil) | |
160 | ;; Indicator for the double mode. | |
161 | (make-variable-buffer-local 'double-mode) | |
162 | ||
163 | (or (assq 'double-mode minor-mode-alist) | |
164 | (setq minor-mode-alist | |
48a0ae63 | 165 | (cons '(double-mode " Double") minor-mode-alist))) |
fc429cfe | 166 | |
48a0ae63 RS |
167 | ;; This feature seemed useless and it confused describe-mode, |
168 | ;; so I deleted it. | |
169 | ;;;(defvar double-mode-name "Double") | |
170 | ;;;;; Name of current double mode. | |
171 | ;;; (make-variable-buffer-local 'double-mode-name) | |
fc429cfe RS |
172 | |
173 | ;;;###autoload | |
174 | (defun double-mode (arg) | |
48a0ae63 RS |
175 | "Toggle Double mode. |
176 | With prefix arg, turn Double mode on iff arg is positive. | |
fc429cfe | 177 | |
e6f1da19 KH |
178 | When Double mode is on, some keys will insert different strings |
179 | when pressed twice. See variable `double-map' for details." | |
fc429cfe RS |
180 | (interactive "P") |
181 | (if (or (and (null arg) double-mode) | |
182 | (<= (prefix-numeric-value arg) 0)) | |
183 | ;; Turn it off | |
184 | (if double-mode | |
185 | (progn | |
186 | (let ((double-map)) | |
187 | (double-setup)) | |
188 | (setq double-mode nil) | |
e6f1da19 | 189 | (force-mode-line-update))) |
fc429cfe RS |
190 | ;;Turn it on |
191 | (if double-mode | |
192 | () | |
193 | (double-setup) | |
194 | (setq double-mode t) | |
e6f1da19 | 195 | (force-mode-line-update)))) |
fc429cfe RS |
196 | |
197 | (provide 'double) | |
198 | ||
199 | ;;; double.el ends here | |
200 |