1 ;;; vt-control.el --- Common VTxxx control functions
3 ;; Copyright (C) 1993, 1994 Free Software Foundation, Inc.
5 ;; Author: Rob Riepel <riepel@networking.stanford.edu>
6 ;; Maintainer: Rob Riepel <riepel@networking.stanford.edu>
9 ;; This file is part of GNU Emacs.
11 ;; GNU Emacs is free software; you can redistribute it and/or modify
12 ;; it under the terms of the GNU General Public License as published by
13 ;; the Free Software Foundation; either version 2, or (at your option)
16 ;; GNU Emacs is distributed in the hope that it will be useful,
17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 ;; GNU General Public License for more details.
21 ;; You should have received a copy of the GNU General Public License
22 ;; along with GNU Emacs; see the file COPYING. If not, write to
23 ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
27 ;; The functions contained in this file send various VT control codes
28 ;; to the terminal where emacs is running. The following functions are
33 ;; vt-wide set wide screen (132 characters)
34 ;; vt-narrow set narrow screen (80 characters)
35 ;; vt-toggle-screen toggle wide/narrow screen
36 ;; vt-keypad-on set applications keypad on
37 ;; vt-keypad-off set applications keypad off
38 ;; vt-numlock toggle applications keypad on/off
42 ;; To use enable these functions, simply load this file.
44 ;; Note: vt-control makes no effort to determine how the terminal is
45 ;; initially set. It assumes the terminal starts with a width
46 ;; of 80 characters and the applications keypad enabled. Nor
47 ;; does vt-control try to restore the terminal when emacs is
48 ;; killed or suspended.
55 (defvar vt-applications-keypad-p t
56 "If non-nil, keypad is in applications mode.")
59 "If non-nil, the screen is 132 characters wide.")
62 ;;; Screen width functions.
65 "Set the screen 132 characters wide."
67 (send-string-to-terminal "\e[?3h")
68 (set-frame-width (selected-frame) 132)
72 "Set the screen 80 characters wide."
74 (send-string-to-terminal "\e[?3l")
75 (set-frame-width (selected-frame) 80)
78 (defun vt-toggle-screen nil
79 "Toggle between 80 and 132 character screen width."
81 (if vt-wide-p (vt-narrow) (vt-wide)))
84 ;;; Applications keypad functions.
86 (defun vt-keypad-on (&optional tell)
87 "Turn on the VT applications keypad."
89 (send-string-to-terminal "\e[\e=")
90 (setq vt-applications-keypad-p t)
91 (if (or tell (interactive-p)) (message "Applications keypad enabled.")))
93 (defun vt-keypad-off (&optional tell)
94 "Turn off the VT applications keypad."
96 (send-string-to-terminal "\e[\e>")
97 (setq vt-applications-keypad-p nil)
98 (if (or tell (interactive-p)) (message "Applications keypad disabled.")))
100 (defun vt-numlock nil
101 "Toggle VT application keypad on and off."
103 (if vt-applications-keypad-p (vt-keypad-off (interactive-p))
104 (vt-keypad-on (interactive-p))))
106 ;;; vt-control.el ends here