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-;;; vt100-led.el --- functions for LED control on VT-100 terminals & clones.
-
-;; Copyright (C) 1988 Free Software Foundation, Inc.
-
-;; Author: Howard Gayle
-;; Maintainer: FSF
-;; Keywords: hardware
-
-;; This file is part of GNU Emacs.
-
-;; GNU Emacs is free software; you can redistribute it and/or modify
-;; it under the terms of the GNU General Public License as published by
-;; the Free Software Foundation; either version 2, or (at your option)
-;; any later version.
-
-;; 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; see the file COPYING. If not, write to the
-;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-;; Boston, MA 02111-1307, USA.
-
-;;; Code:
-
-(defvar led-state (make-vector 5 nil)
- "The internal state of the LEDs. Choices are nil, t, `flash.
-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."
- (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)
-
-;;; vt100-led.el ends here