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1 | ;;; vt100-led.el --- functions for LED control on VT-100 terminals & clones. |
2 | ||
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3 | ;; Copyright (C) 1988 Free Software Foundation, Inc. |
4 | ||
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5 | ;; Author: Howard Gayle |
6 | ;; Maintainer: FSF | |
6251ee24 | 7 | ;; Keywords: hardware |
e5167999 | 8 | |
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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 | |
e5167999 | 13 | ;; the Free Software Foundation; either version 2, or (at your option) |
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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 | |
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22 | ;; along with GNU Emacs; see the file COPYING. If not, write to the |
23 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
24 | ;; Boston, MA 02111-1307, USA. | |
3b4a6e27 | 25 | |
e5167999 | 26 | ;;; Code: |
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27 | |
28 | (defvar led-state (make-vector 5 nil) | |
29 | "The internal state of the LEDs. Choices are nil, t, `flash. | |
30 | Element 0 is not used.") | |
31 | ||
32 | (defun led-flash (l) | |
33 | "Flash LED l." | |
34 | (aset led-state l 'flash) | |
35 | (led-update)) | |
36 | ||
37 | (defun led-off (&optional l) | |
38 | "Turn off vt100 led number L. With no argument, turn them all off." | |
39 | (interactive "P") | |
40 | (if l | |
41 | (aset led-state (prefix-numeric-value l) nil) | |
42 | (fillarray led-state nil)) | |
43 | (led-update)) | |
44 | ||
45 | (defun led-on (l) | |
46 | "Turn on LED l." | |
47 | (aset led-state l t) | |
48 | (led-update)) | |
49 | ||
50 | (defun led-update () | |
51 | "Update the terminal's LEDs to reflect the internal state." | |
52 | (let ((f "\e[?0") ; String to flash. | |
53 | (o "\e[0") ; String for steady on. | |
54 | (l 1)) ; Current LED number. | |
55 | (while (/= l 5) | |
56 | (let ((s (aref led-state l))) | |
57 | (cond | |
58 | ((eq s 'flash) | |
59 | (setq f (concat f ";" (int-to-string l)))) | |
60 | (s | |
61 | (setq o (concat o ";" (int-to-string l)))))) | |
62 | (setq l (1+ l))) | |
63 | (setq o (concat o "q" f "t")) | |
64 | (send-string-to-terminal o))) | |
65 | ||
66 | (provide 'vt100-led) | |
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67 | |
68 | ;;; vt100-led.el ends here |