| 1 | ;;; vt-control.el --- Common VTxxx control functions |
| 2 | |
| 3 | ;; Copyright (C) 1993-1994, 2001-2014 Free Software Foundation, Inc. |
| 4 | |
| 5 | ;; Author: Rob Riepel <riepel@networking.stanford.edu> |
| 6 | ;; Maintainer: Rob Riepel <riepel@networking.stanford.edu> |
| 7 | ;; Keywords: terminals |
| 8 | |
| 9 | ;; This file is part of GNU Emacs. |
| 10 | |
| 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 3 of the License, or |
| 14 | ;; (at your option) any later version. |
| 15 | |
| 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. |
| 20 | |
| 21 | ;; You should have received a copy of the GNU General Public License |
| 22 | ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. |
| 23 | |
| 24 | ;;; Commentary: |
| 25 | |
| 26 | ;; The functions contained in this file send various VT control codes |
| 27 | ;; to the terminal where emacs is running. The following functions are |
| 28 | ;; available. |
| 29 | |
| 30 | ;; Function Action |
| 31 | |
| 32 | ;; vt-wide set wide screen (132 characters) |
| 33 | ;; vt-narrow set narrow screen (80 characters) |
| 34 | ;; vt-toggle-screen toggle wide/narrow screen |
| 35 | ;; vt-keypad-on set applications keypad on |
| 36 | ;; vt-keypad-off set applications keypad off |
| 37 | ;; vt-numlock toggle applications keypad on/off |
| 38 | |
| 39 | ;;; Usage: |
| 40 | |
| 41 | ;; To use enable these functions, simply load this file. |
| 42 | |
| 43 | ;; Note: vt-control makes no effort to determine how the terminal is |
| 44 | ;; initially set. It assumes the terminal starts with a width |
| 45 | ;; of 80 characters and the applications keypad enabled. Nor |
| 46 | ;; does vt-control try to restore the terminal when emacs is |
| 47 | ;; killed or suspended. |
| 48 | |
| 49 | ;;; Code: |
| 50 | |
| 51 | |
| 52 | ;;; Global variables |
| 53 | |
| 54 | (defvar vt-applications-keypad-p t |
| 55 | "If non-nil, keypad is in applications mode.") |
| 56 | |
| 57 | (defvar vt-wide-p nil |
| 58 | "If non-nil, the screen is 132 characters wide.") |
| 59 | |
| 60 | |
| 61 | ;;; Screen width functions. |
| 62 | |
| 63 | (defun vt-wide nil |
| 64 | "Set the screen 132 characters wide." |
| 65 | (interactive) |
| 66 | (send-string-to-terminal "\e[?3h") |
| 67 | (set-frame-width (selected-frame) 132) |
| 68 | (setq vt-wide-p t)) |
| 69 | |
| 70 | (defun vt-narrow nil |
| 71 | "Set the screen 80 characters wide." |
| 72 | (interactive) |
| 73 | (send-string-to-terminal "\e[?3l") |
| 74 | (set-frame-width (selected-frame) 80) |
| 75 | (setq vt-wide-p nil)) |
| 76 | |
| 77 | (defun vt-toggle-screen nil |
| 78 | "Toggle between 80 and 132 character screen width." |
| 79 | (interactive) |
| 80 | (if vt-wide-p (vt-narrow) (vt-wide))) |
| 81 | |
| 82 | |
| 83 | ;;; Applications keypad functions. |
| 84 | |
| 85 | (defun vt-keypad-on (&optional tell) |
| 86 | "Turn on the VT applications keypad." |
| 87 | (interactive) |
| 88 | (send-string-to-terminal "\e=") |
| 89 | (setq vt-applications-keypad-p t) |
| 90 | (if (or tell (called-interactively-p 'interactive)) |
| 91 | (message "Applications keypad enabled."))) |
| 92 | |
| 93 | (defun vt-keypad-off (&optional tell) |
| 94 | "Turn off the VT applications keypad." |
| 95 | (interactive "p") |
| 96 | (send-string-to-terminal "\e>") |
| 97 | (setq vt-applications-keypad-p nil) |
| 98 | (if (or tell (called-interactively-p 'interactive)) |
| 99 | (message "Applications keypad disabled."))) |
| 100 | |
| 101 | (defun vt-numlock nil |
| 102 | "Toggle VT application keypad on and off." |
| 103 | (interactive) |
| 104 | (if vt-applications-keypad-p |
| 105 | (vt-keypad-off (called-interactively-p 'interactive)) |
| 106 | (vt-keypad-on (called-interactively-p 'interactive)))) |
| 107 | |
| 108 | (provide 'vt-control) |
| 109 | |
| 110 | ;;; vt-control.el ends here |