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1 ;;; vt100-led.el --- functions for LED control on VT-100 terminals & clones.
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2
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3 ;; Copyright (C) 1988 Free Software Foundation, Inc.
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4
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5 ;; Author: Howard Gayle
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6 ;; Maintainer: FSF
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7 ;; Keywords: hardware
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8
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9 ;; This file is part of XEmacs.
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10
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11 ;; XEmacs is free software; you can redistribute it and/or modify it
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12 ;; under the terms of the GNU General Public License as published by
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13 ;; the Free Software Foundation; either version 2, or (at your option)
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14 ;; any later version.
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15
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16 ;; XEmacs is distributed in the hope that it will be useful, but
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17 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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19 ;; General Public License for more details.
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20
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21 ;; You should have received a copy of the GNU General Public License
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22 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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23 ;; Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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24
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25 ;;; Code:
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26
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27 (defvar led-state (make-vector 5 nil)
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28 "The internal state of the LEDs. Choices are nil, t, `flash.
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29 Element 0 is not used.")
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30
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31 (defun led-flash (l)
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32 "Flash LED l."
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33 (aset led-state l 'flash)
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34 (led-update))
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35
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36 (defun led-off (&optional l)
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37 "Turn off vt100 led number L. With no argument, turn them all off."
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38 (interactive "P")
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39 (if l
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40 (aset led-state (prefix-numeric-value l) nil)
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41 (fillarray led-state nil))
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42 (led-update))
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43
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44 (defun led-on (l)
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45 "Turn on LED l."
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46 (aset led-state l t)
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47 (led-update))
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48
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49 (defun led-update ()
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50 "Update the terminal's LEDs to reflect the internal state."
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51 (let ((f "\e[?0") ; String to flash.
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52 (o "\e[0") ; String for steady on.
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53 (l 1)) ; Current LED number.
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54 (while (/= l 5)
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55 (let ((s (aref led-state l)))
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56 (cond
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57 ((eq s 'flash)
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58 (setq f (concat f ";" (int-to-string l))))
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59 (s
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60 (setq o (concat o ";" (int-to-string l))))))
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61 (setq l (1+ l)))
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62 (setq o (concat o "q" f "t"))
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63 (send-string-to-terminal o)))
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64
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65 (provide 'vt100-led)
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66
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67 ;;; vt100-led.el ends here
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