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fc68affa ER |
1 | ;;; flow-ctrl.el --- help for lusers on cu(1) or ttys with wired-in ^S/^Q flow control |
2 | ||
82ce8acc | 3 | ;;; Copyright (C) 1990, 1991 Free Software Foundation, Inc. |
3a801d0c | 4 | |
fc68affa ER |
5 | ;; Author Kevin Gallagher |
6 | ;; Maintainer: FSF | |
fc68affa | 7 | ;; Adapted-By: ESR |
fd7fa35a | 8 | ;; Keywords: hardware |
1a06eabd | 9 | |
3a801d0c | 10 | ;;; This file is part of GNU Emacs. |
0f39230e JB |
11 | ;;; |
12 | ;;; GNU Emacs is distributed in the hope that it will be useful, but | |
13 | ;;; WITHOUT ANY WARRANTY. No author or distributor accepts | |
14 | ;;; RESPONSIBILITY TO anyone for the consequences of using it or for | |
15 | ;;; whether it serves any particular purpose or works at all, unless | |
16 | ;;; he says so in writing. Refer to the GNU Emacs General Public | |
17 | ;;; License for full details. | |
18 | ;;; | |
19 | ;;; Everyone is granted permission to copy, modify and redistribute | |
20 | ;;; GNU Emacs, but only under the conditions described in the GNU | |
21 | ;;; Emacs General Public License. A copy of this license is supposed | |
22 | ;;; to have been given to you along with GNU Emacs so you can know | |
23 | ;;; your rights and responsibilities. It should be in a file named | |
24 | ;;; COPYING. Among other things, the Copyright notice and this notice | |
25 | ;;; must be preserved on all copies. | |
fc68affa ER |
26 | |
27 | ;;; Commentary: | |
0f39230e JB |
28 | |
29 | ;;;; Terminals that use XON/XOFF flow control can cause problems with | |
282d89c0 | 30 | ;;;; GNU Emacs users. This file contains Emacs Lisp code that makes it |
0f39230e JB |
31 | ;;;; easy for a user to deal with this problem, when using such a |
32 | ;;;; terminal. | |
33 | ;;;; | |
34 | ;;;; To invoke these adjustments, a user need only invoke the function | |
35 | ;;;; evade-flow-control-on with a list of terminal types in his/her own | |
36 | ;;;; .emacs file. As arguments, give it the names of one or more terminal | |
37 | ;;;; types in use by that user which require flow control adjustments. | |
38 | ;;;; Here's an example: | |
39 | ;;;; | |
40 | ;;;; (evade-flow-control-on "vt200" "vt300" "vt101" "vt131") | |
41 | ||
42 | ;;; Portability note: This uses (getenv "TERM"), and therefore probably | |
43 | ;;; won't work outside of UNIX-like environments. | |
44 | ||
fc68affa ER |
45 | ;;; Code: |
46 | ||
0f39230e | 47 | (defun evade-flow-control () |
9c50f912 | 48 | "Enable use of flow control; let user type C-s as C-\ and C-q as C-^." |
0f39230e JB |
49 | (interactive) |
50 | ;; Tell emacs to pass C-s and C-q to OS. | |
b2830f36 | 51 | (set-input-mode nil t nil) |
0f39230e JB |
52 | ;; Initialize translate table, saving previous mappings, if any. |
53 | (let ((the-table (make-string 128 0))) | |
54 | (let ((i 0) | |
55 | (j (length keyboard-translate-table))) | |
56 | (while (< i j) | |
57 | (aset the-table i (elt keyboard-translate-table i)) | |
58 | (setq i (1+ i))) | |
59 | (while (< i 128) | |
60 | (aset the-table i i) | |
61 | (setq i (1+ i)))) | |
62 | (setq keyboard-translate-table the-table)) | |
63 | ;; Swap C-s and C-\ | |
64 | (aset keyboard-translate-table ?\034 ?\^s) | |
65 | (aset keyboard-translate-table ?\^s ?\034) | |
66 | ;; Swap C-q and C-^ | |
67 | (aset keyboard-translate-table ?\036 ?\^q) | |
68 | (aset keyboard-translate-table ?\^q ?\036) | |
69 | (message (concat | |
70 | "XON/XOFF adjustment for " | |
71 | (getenv "TERM") | |
72 | ": use C-\\ for C-s and use C-^ for C-q.")) | |
73 | (sleep-for 2)) ; Give user a chance to see message. | |
74 | ||
9c50f912 | 75 | (defun evade-flow-control-memstr= (e s) |
0f39230e JB |
76 | (cond ((null s) nil) |
77 | ((string= e (car s)) t) | |
9c50f912 | 78 | (t (evade-flow-control-memstr= e (cdr s))))) |
0f39230e JB |
79 | |
80 | ;;;###autoload | |
81 | (defun evade-flow-control-on (&rest losing-terminal-types) | |
9c50f912 | 82 | "Enable flow control if using one of a specified set of terminal types. |
328561fc | 83 | Use `(evade-flow-control-on \"vt100\" \"h19\")' to enable flow control |
9c50f912 | 84 | on VT-100 and H19 terminals. When flow control is enabled, |
328561fc | 85 | you must type C-\\ to get the effect of a C-s, and type C-^ |
9c50f912 | 86 | to get the effect of a C-q." |
0f39230e JB |
87 | (let ((term (getenv "TERM")) |
88 | hyphend) | |
89 | ;; Strip off hyphen and what follows | |
90 | (while (setq hyphend (string-match "[-_][^-_]+$" term)) | |
91 | (setq term (substring term 0 hyphend))) | |
9c50f912 | 92 | (and (evade-flow-control-memstr= term losing-terminal-types) (evade-flow-control))) |
0f39230e JB |
93 | ) |
94 | ||
49116ac0 JB |
95 | (provide 'flow-ctrl) |
96 | ||
1a06eabd | 97 | ;;; flow-ctrl.el ends here |