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108 lines
3.2 KiB
EmacsLisp
108 lines
3.2 KiB
EmacsLisp
;;; vt-control.el --- Common VTxxx control functions -*- lexical-binding:t -*-
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;; Copyright (C) 1993-1994, 2001-2021 Free Software Foundation, Inc.
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;; Author: Rob Riepel <riepel@networking.stanford.edu>
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;; Keywords: terminals
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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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;; The functions contained in this file send various VT control codes
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;; to the terminal where Emacs is running. The following functions are
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;; available.
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;; Function Action
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;; vt-wide set wide screen (132 characters)
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;; vt-narrow set narrow screen (80 characters)
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;; vt-toggle-screen toggle wide/narrow screen
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;; vt-keypad-on set applications keypad on
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;; vt-keypad-off set applications keypad off
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;; vt-numlock toggle applications keypad on/off
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;;; Usage:
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;; To use enable these functions, simply load this file.
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;; Note: vt-control makes no effort to determine how the terminal is
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;; initially set. It assumes the terminal starts with a width
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;; of 80 characters and the applications keypad enabled. Nor
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;; does vt-control try to restore the terminal when emacs is
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;; killed or suspended.
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;;; Code:
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;;; Global variables
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(defvar vt-applications-keypad-p t
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"If non-nil, keypad is in applications mode.")
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(defvar vt-wide-p nil
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"If non-nil, the screen is 132 characters wide.")
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;;; Screen width functions.
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(defun vt-wide nil
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"Set the screen 132 characters wide."
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(interactive)
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(send-string-to-terminal "\e[?3h")
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(set-frame-width (selected-frame) 132)
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(setq vt-wide-p t))
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(defun vt-narrow nil
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"Set the screen 80 characters wide."
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(interactive)
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(send-string-to-terminal "\e[?3l")
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(set-frame-width (selected-frame) 80)
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(setq vt-wide-p nil))
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(defun vt-toggle-screen nil
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"Toggle between 80 and 132 character screen width."
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(interactive)
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(if vt-wide-p (vt-narrow) (vt-wide)))
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;;; Applications keypad functions.
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(defun vt-keypad-on (&optional tell)
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"Turn on the VT applications keypad."
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(interactive "p")
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(send-string-to-terminal "\e=")
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(setq vt-applications-keypad-p t)
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(if tell (message "Applications keypad enabled.")))
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(defun vt-keypad-off (&optional tell)
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"Turn off the VT applications keypad."
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(interactive "p")
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(send-string-to-terminal "\e>")
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(setq vt-applications-keypad-p nil)
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(if tell (message "Applications keypad disabled.")))
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(defun vt-numlock (&optional tell)
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"Toggle VT application keypad on and off."
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(interactive "p")
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(if vt-applications-keypad-p
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(vt-keypad-off tell)
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(vt-keypad-on tell)))
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(provide 'vt-control)
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;;; vt-control.el ends here
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