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1 | ;;; vt-control.el --- Common VTxxx control functions |
2 | ||
a515f569 | 3 | ;; Copyright (C) 1993, 1994 Free Software Foundation, Inc. |
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4 | |
5 | ;; Author: Rob Riepel <riepel@networking.stanford.edu> | |
6 | ;; Maintainer: Rob Riepel <riepel@networking.stanford.edu> | |
b7f66977 | 7 | ;; Keywords: terminals |
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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 2, or (at your option) | |
14 | ;; any later version. | |
15 | ||
522f9216 | 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 |
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; see the file COPYING. If not, write to | |
23 | ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
522f9216 | 24 | |
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25 | ;;; Commentary: |
26 | ||
27 | ;; The functions contained in this file send various VT control codes | |
28 | ;; to the terminal where emacs is running. The following functions are | |
29 | ;; available. | |
30 | ||
31 | ;; Function Action | |
32 | ||
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 | |
39 | ||
40 | ;;; Usage: | |
41 | ||
42 | ;; To use enable these functions, simply load this file. | |
43 | ||
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. | |
49 | ||
50 | ;;; Code: | |
51 | ||
52 | ||
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53 | ;;; Global variables |
54 | ||
55 | (defvar vt-applications-keypad-p t | |
56 | "If non-nil, keypad is in applications mode.") | |
57 | ||
58 | (defvar vt-wide-p nil | |
59 | "If non-nil, the screen is 132 characters wide.") | |
60 | ||
61 | ||
62 | ;;; Screen width functions. | |
63 | ||
64 | (defun vt-wide nil | |
65 | "Set the screen 132 characters wide." | |
66 | (interactive) | |
67 | (send-string-to-terminal "\e[?3h") | |
68 | (set-screen-width 132) | |
69 | (setq vt-wide-p t)) | |
70 | ||
71 | (defun vt-narrow nil | |
72 | "Set the screen 80 characters wide." | |
73 | (interactive) | |
74 | (send-string-to-terminal "\e[?3l") | |
75 | (set-screen-width 80) | |
76 | (setq vt-wide-p nil)) | |
77 | ||
78 | (defun vt-toggle-screen nil | |
79 | "Toggle between 80 and 132 character screen width." | |
80 | (interactive) | |
81 | (if vt-wide-p (vt-narrow) (vt-wide))) | |
82 | ||
83 | ||
84 | ;;; Applications keypad functions. | |
85 | ||
86 | (defun vt-keypad-on (&optional tell) | |
87 | "Turn on the VT applications keypad." | |
88 | (interactive) | |
89 | (send-string-to-terminal "\e[\e=") | |
90 | (setq vt-applications-keypad-p t) | |
91 | (if (or tell (interactive-p)) (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[\e>") | |
97 | (setq vt-applications-keypad-p nil) | |
98 | (if (or tell (interactive-p)) (message "Applications keypad disabled."))) | |
99 | ||
100 | (defun vt-numlock nil | |
101 | "Toggle VT application keypad on and off." | |
102 | (interactive) | |
103 | (if vt-applications-keypad-p (vt-keypad-off (interactive-p)) | |
104 | (vt-keypad-on (interactive-p)))) | |
105 | ||
106 | ;;; vt-control.el ends here |