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55535639 | 1 | ;;; vt100-led.el --- functions for LED control on VT-100 terminals & clones |
76d7458e | 2 | |
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3 | ;; Copyright (C) 1988 Free Software Foundation, Inc. |
4 | ||
e5167999 ER |
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) |
3b4a6e27 JB |
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 | |
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26 | ;;; Commentary: |
27 | ||
e5167999 | 28 | ;;; Code: |
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29 | |
30 | (defvar led-state (make-vector 5 nil) | |
31 | "The internal state of the LEDs. Choices are nil, t, `flash. | |
32 | Element 0 is not used.") | |
33 | ||
34 | (defun led-flash (l) | |
35 | "Flash LED l." | |
36 | (aset led-state l 'flash) | |
37 | (led-update)) | |
38 | ||
39 | (defun led-off (&optional l) | |
40 | "Turn off vt100 led number L. With no argument, turn them all off." | |
41 | (interactive "P") | |
42 | (if l | |
43 | (aset led-state (prefix-numeric-value l) nil) | |
44 | (fillarray led-state nil)) | |
45 | (led-update)) | |
46 | ||
47 | (defun led-on (l) | |
48 | "Turn on LED l." | |
49 | (aset led-state l t) | |
50 | (led-update)) | |
51 | ||
52 | (defun led-update () | |
53 | "Update the terminal's LEDs to reflect the internal state." | |
54 | (let ((f "\e[?0") ; String to flash. | |
55 | (o "\e[0") ; String for steady on. | |
56 | (l 1)) ; Current LED number. | |
57 | (while (/= l 5) | |
58 | (let ((s (aref led-state l))) | |
59 | (cond | |
60 | ((eq s 'flash) | |
61 | (setq f (concat f ";" (int-to-string l)))) | |
62 | (s | |
63 | (setq o (concat o ";" (int-to-string l)))))) | |
64 | (setq l (1+ l))) | |
65 | (setq o (concat o "q" f "t")) | |
66 | (send-string-to-terminal o))) | |
67 | ||
68 | (provide 'vt100-led) | |
76d7458e | 69 | |
ab5796a9 | 70 | ;;; arch-tag: 346e6480-5e31-4234-aafe-257cea4a36d1 |
76d7458e | 71 | ;;; vt100-led.el ends here |