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1 ;;; vt-control.el --- Common VTxxx control functions
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2
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3 ;; Copyright (C) 1993, 1994 Free Software Foundation, Inc.
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4
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5 ;; Author: Rob Riepel <riepel@networking.stanford.edu>
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6 ;; Maintainer: Rob Riepel <riepel@networking.stanford.edu>
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7 ;; Keywords: terminals
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8
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9 ;; This file is part of GNU Emacs.
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10
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11 ;; GNU Emacs is free software; you can redistribute it and/or modify
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12 ;; it under the terms of the GNU General Public License as published by
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13 ;; the Free Software Foundation; either version 2, or (at your option)
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14 ;; any later version.
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15
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16 ;; GNU Emacs is distributed in the hope that it will be useful,
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17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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19 ;; GNU General Public License for more details.
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20
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21 ;; You should have received a copy of the GNU General Public License
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22 ;; along with GNU Emacs; see the file COPYING. If not, write to
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23 ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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24
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25 ;;; Commentary:
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26
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27 ;; The functions contained in this file send various VT control codes
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28 ;; to the terminal where emacs is running. The following functions are
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29 ;; available.
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30
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31 ;; Function Action
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32
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33 ;; vt-wide set wide screen (132 characters)
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34 ;; vt-narrow set narrow screen (80 characters)
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35 ;; vt-toggle-screen toggle wide/narrow screen
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36 ;; vt-keypad-on set applications keypad on
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37 ;; vt-keypad-off set applications keypad off
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38 ;; vt-numlock toggle applications keypad on/off
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39
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40 ;;; Usage:
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41
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42 ;; To use enable these functions, simply load this file.
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43
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44 ;; Note: vt-control makes no effort to determine how the terminal is
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45 ;; initially set. It assumes the terminal starts with a width
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46 ;; of 80 characters and the applications keypad enabled. Nor
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47 ;; does vt-control try to restore the terminal when emacs is
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48 ;; killed or suspended.
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49
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50 ;;; Code:
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51
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52
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53 ;;; Global variables
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54
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55 (defvar vt-applications-keypad-p t
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56 "If non-nil, keypad is in applications mode.")
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57
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58 (defvar vt-wide-p nil
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59 "If non-nil, the screen is 132 characters wide.")
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60
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61
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62 ;;; Screen width functions.
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63
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64 (defun vt-wide nil
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65 "Set the screen 132 characters wide."
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66 (interactive)
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67 (send-string-to-terminal "\e[?3h")
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68 (set-frame-width (selected-frame) 132)
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69 (setq vt-wide-p t))
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70
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71 (defun vt-narrow nil
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72 "Set the screen 80 characters wide."
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73 (interactive)
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74 (send-string-to-terminal "\e[?3l")
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75 (set-frame-width (selected-frame) 80)
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76 (setq vt-wide-p nil))
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77
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78 (defun vt-toggle-screen nil
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79 "Toggle between 80 and 132 character screen width."
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80 (interactive)
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81 (if vt-wide-p (vt-narrow) (vt-wide)))
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82
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83
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84 ;;; Applications keypad functions.
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85
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86 (defun vt-keypad-on (&optional tell)
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87 "Turn on the VT applications keypad."
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88 (interactive)
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89 (send-string-to-terminal "\e[\e=")
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90 (setq vt-applications-keypad-p t)
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91 (if (or tell (interactive-p)) (message "Applications keypad enabled.")))
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92
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93 (defun vt-keypad-off (&optional tell)
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94 "Turn off the VT applications keypad."
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95 (interactive "p")
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96 (send-string-to-terminal "\e[\e>")
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97 (setq vt-applications-keypad-p nil)
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98 (if (or tell (interactive-p)) (message "Applications keypad disabled.")))
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99
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100 (defun vt-numlock nil
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101 "Toggle VT application keypad on and off."
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102 (interactive)
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103 (if vt-applications-keypad-p (vt-keypad-off (interactive-p))
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104 (vt-keypad-on (interactive-p))))
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105
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106 ;;; vt-control.el ends here
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