mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-12-25 10:47:00 +00:00
71 lines
2.0 KiB
EmacsLisp
71 lines
2.0 KiB
EmacsLisp
;;; vt100-led.el --- functions for LED control on VT-100 terminals & clones
|
|
|
|
;; Copyright (C) 1988, 2001, 2002, 2003, 2004, 2005,
|
|
;; 2006, 2007, 2008, 2009 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 3 of the License, 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. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
;;; Commentary:
|
|
|
|
;;; 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)
|
|
|
|
;; arch-tag: 346e6480-5e31-4234-aafe-257cea4a36d1
|
|
;;; vt100-led.el ends here
|