XEmacs 21.2-b1

[chise/xemacs-chise.git.1] / lisp / term / vt-control.el

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+;;; 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, 675 Mass Ave, Cambridge, MA 02139, 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-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[\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[\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))))
+
+;;; vt-control.el ends here