;;; vt-control.el --- Common VTxxx control functions ;; Copyright (C) 1993, 1994 Free Software Foundation, Inc. ;; Author: Rob Riepel <riepel@networking.stanford.edu> ;; Maintainer: 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 2, 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; see the file COPYING. If not, write to the ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, ;; Boston, MA 02111-1307, USA. ;;; 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-screen-width 132) (setq vt-wide-p t)) (defun vt-narrow nil "Set the screen 80 characters wide." (interactive) (send-string-to-terminal "\e[?3l") (set-screen-width 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 (interactive-p)) (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 (interactive-p)) (message "Applications keypad disabled."))) (defun vt-numlock nil "Toggle VT application keypad on and off." (interactive) (if vt-applications-keypad-p (vt-keypad-off (interactive-p)) (vt-keypad-on (interactive-p)))) (provide 'vt-control) ;;; vt-control.el ends here