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