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;;; vt100.el --- define VT100 function key sequences in function-key-map
;; Copyright (C) 1989, 1993 Free Software Foundation, Inc.
;; Author: FSF
;; 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:
;; Uses the Emacs 19 terminal initialization features --- won't work with 18.
;; Handles all VT100 clones, including the Apollo terminal. Also handles
;; the VT200 --- its PF- and arrow- keys are different, but all those
;; are really set up by the terminal initialization code, which mines them
;; out of termcap. This package is here to define the keypad comma, dash
;; and period (which aren't in termcap's repertoire) and the function for
;; changing from 80 to 132 columns & vv.
;;; Code:
;; Set up function-key-map entries that termcap and terminfo don't know.
(load "term/lk201" nil t)
;;; Controlling the screen width.
(defconst vt100-wide-mode (= (frame-width) 132)
"t if vt100 is in 132-column mode.")
(defun vt100-wide-mode (&optional arg)
"Toggle 132/80 column mode for vt100s.
With positive argument, switch to 132-column mode.
With negative argument, switch to 80-column mode."
(interactive "P")
(setq vt100-wide-mode
(if (null arg) (not vt100-wide-mode)
(> (prefix-numeric-value arg) 0)))
(send-string-to-terminal (if vt100-wide-mode "\e[?3h" "\e[?3l"))
(set-frame-width terminal-frame (if vt100-wide-mode 132 80)))
;;; vt100.el ends here
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