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emacs/lisp/vt100-led.el

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;;; vt100-led.el --- functions for LED control on VT-100 terminals & clones
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;; Copyright (C) 1988, 2001, 2002, 2003, 2004, 2005,
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;; 2006, 2007, 2008 Free Software Foundation, Inc.
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;; Author: Howard Gayle
;; Maintainer: FSF
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;; Keywords: hardware
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;; This file is part of GNU Emacs.
;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;;; Code:
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(defvar led-state (make-vector 5 nil)
"The internal state of the LEDs. Choices are nil, t, `flash'.
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Element 0 is not used.")
(defun led-flash (l)
"Flash LED l."
(aset led-state l 'flash)
(led-update))
(defun led-off (&optional l)
"Turn off vt100 led number L. With no argument, turn them all off."
(interactive "P")
(if l
(aset led-state (prefix-numeric-value l) nil)
(fillarray led-state nil))
(led-update))
(defun led-on (l)
"Turn on LED L."
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(aset led-state l t)
(led-update))
(defun led-update ()
"Update the terminal's LEDs to reflect the internal state."
(let ((f "\e[?0") ; String to flash.
(o "\e[0") ; String for steady on.
(l 1)) ; Current LED number.
(while (/= l 5)
(let ((s (aref led-state l)))
(cond
((eq s 'flash)
(setq f (concat f ";" (int-to-string l))))
(s
(setq o (concat o ";" (int-to-string l))))))
(setq l (1+ l)))
(setq o (concat o "q" f "t"))
(send-string-to-terminal o)))
(provide 'vt100-led)
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;; arch-tag: 346e6480-5e31-4234-aafe-257cea4a36d1
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;;; vt100-led.el ends here