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