Mercurial > hg > xemacs-beta
view lisp/term/vt100-led.el @ 5927:b58b74274fa2 cygwin
changes from long ago, never committed...
author | Henry Thompson <ht@markup.co.uk> |
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date | Wed, 15 Dec 2021 19:02:33 +0000 |
parents | 308d34e9f07d |
children |
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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 XEmacs. ;; XEmacs 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 3 of the License, or (at your ;; option) any later version. ;; XEmacs 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 XEmacs. If not, see <http://www.gnu.org/licenses/>. ;;; 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