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Most of this change is to boilerplate commentary such as license URLs. This change was prompted by ftp://ftp.gnu.org's going-away party, planned for November. Change these FTP URLs to https://ftp.gnu.org instead. Make similar changes for URLs to other organizations moving away from FTP. Also, change HTTP to HTTPS for URLs to gnu.org and fsf.org when this works, as this will further help defend against man-in-the-middle attacks (for this part I omitted the MS-DOS and MS-Windows sources and the test tarballs to keep the workload down). HTTPS is not fully working to lists.gnu.org so I left those URLs alone for now.
69 lines
1.9 KiB
EmacsLisp
69 lines
1.9 KiB
EmacsLisp
;;; vt100-led.el --- functions for LED control on VT-100 terminals & clones
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;; Copyright (C) 1988, 2001-2017 Free Software Foundation, Inc.
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;; Author: Howard Gayle
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;; Maintainer: emacs-devel@gnu.org
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;; Keywords: hardware
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;; This file is part of GNU Emacs.
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;; 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
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <https://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)
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"The internal state of the LEDs. Choices are nil, t, `flash'.
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Element 0 is not used.")
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(defun led-flash (l)
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"Flash LED l."
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(aset led-state l 'flash)
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(led-update))
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(defun led-off (&optional l)
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"Turn off vt100 led number L. With no argument, turn them all off."
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(interactive "P")
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(if l
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(aset led-state (prefix-numeric-value l) nil)
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(fillarray led-state nil))
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(led-update))
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(defun led-on (l)
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"Turn on LED L."
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(aset led-state l t)
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(led-update))
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(defun led-update ()
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"Update the terminal's LEDs to reflect the internal state."
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(let ((f "\e[?0") ; String to flash.
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(o "\e[0") ; String for steady on.
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(l 1)) ; Current LED number.
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(while (/= l 5)
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(let ((s (aref led-state l)))
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(cond
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((eq s 'flash)
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(setq f (concat f ";" (int-to-string l))))
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(s
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(setq o (concat o ";" (int-to-string l))))))
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(setq l (1+ l)))
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(setq o (concat o "q" f "t"))
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(send-string-to-terminal o)))
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(provide 'vt100-led)
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;;; vt100-led.el ends here
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