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comparison lisp/utils/flow-ctrl.el @ 0:376386a54a3c r19-14

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Import from CVS: tag r19-14
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date Mon, 13 Aug 2007 08:45:50 +0200
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1 ;;; flow-ctrl.el --- help for lusers on cu(1) or ttys with wired-in ^S/^Q flow control
2
3 ;;; Copyright (C) 1990, 1991, 1994 Free Software Foundation, Inc.
4
5 ;; Author Kevin Gallagher
6 ;; Maintainer: FSF
7 ;; Adapted-By: ESR
8 ;; Keywords: hardware
9
10 ;; This file is part of XEmacs.
11
12 ;; XEmacs is free software; you can redistribute it and/or modify it
13 ;; under the terms of the GNU General Public License as published by
14 ;; the Free Software Foundation; either version 2, or (at your option)
15 ;; any later version.
16
17 ;; XEmacs is distributed in the hope that it will be useful, but
18 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 ;; General Public License for more details.
21
22 ;; You should have received a copy of the GNU General Public License
23 ;; along with XEmacs; see the file COPYING. If not, write to the Free
24 ;; Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
25
26 ;;; Synched up with: FSF 19.28.
27
28 ;;; Commentary:
29
30 ;;;; Terminals that use XON/XOFF flow control can cause problems with
31 ;;;; GNU Emacs users. This file contains Emacs Lisp code that makes it
32 ;;;; easy for a user to deal with this problem, when using such a
33 ;;;; terminal.
34 ;;;;
35 ;;;; To invoke these adjustments, a user need only invoke the function
36 ;;;; enable-flow-control-on with a list of terminal types in his/her own
37 ;;;; .emacs file. As arguments, give it the names of one or more terminal
38 ;;;; types in use by that user which require flow control adjustments.
39 ;;;; Here's an example:
40 ;;;;
41 ;;;; (enable-flow-control-on "vt200" "vt300" "vt101" "vt131")
42
43 ;;; Portability note: This uses (getenv "TERM"), and therefore probably
44 ;;; won't work outside of UNIX-like environments.
45
46 ;;; Code:
47
48 (defvar flow-control-c-s-replacement ?\034
49 "Character that replaces C-s, when flow control handling is enabled.")
50 (defvar flow-control-c-q-replacement ?\036
51 "Character that replaces C-q, when flow control handling is enabled.")
52
53 ;;;###autoload
54 (defun enable-flow-control (&optional argument)
55 "Toggle flow control handling.
56 When handling is enabled, user can type C-s as C-\\, and C-q as C-^.
57 With arg, enable flow control mode if arg is positive, otherwise disable."
58 (interactive "P")
59 (if (if argument
60 ;; Argument means enable if arg is positive.
61 (<= (prefix-numeric-value argument) 0)
62 ;; No arg means toggle.
63 (nth 1 (current-input-mode)))
64 (progn
65 ;; Turn flow control off, and stop exchanging chars.
66 (set-input-mode t nil (nth 2 (current-input-mode)))
67 (keyboard-translate flow-control-c-s-replacement nil)
68 (keyboard-translate ?\^s nil)
69 (keyboard-translate flow-control-c-q-replacement nil)
70 (keyboard-translate ?\^q nil))
71 ;; Turn flow control on.
72 ;; Tell emacs to pass C-s and C-q to OS.
73 (set-input-mode nil t (nth 2 (current-input-mode)))
74 ;; Initialize translate table, saving previous mappings, if any.
75 ;; Swap C-s and C-\
76 (keyboard-translate flow-control-c-s-replacement ?\^s)
77 (keyboard-translate ?\^s flow-control-c-s-replacement)
78 ;; Swap C-q and C-^
79 (keyboard-translate flow-control-c-q-replacement ?\^q)
80 (keyboard-translate ?\^q flow-control-c-q-replacement)
81 (message (concat
82 "XON/XOFF adjustment for "
83 (getenv "TERM")
84 ": use C-\\ for C-s and use C-^ for C-q."))
85 (sleep-for 2))) ; Give user a chance to see message.
86
87 ;;;###autoload
88 (defun enable-flow-control-on (&rest losing-terminal-types)
89 "Enable flow control if using one of a specified set of terminal types.
90 Use `(enable-flow-control-on \"vt100\" \"h19\")' to enable flow control
91 on VT-100 and H19 terminals. When flow control is enabled,
92 you must type C-\\ to get the effect of a C-s, and type C-^
93 to get the effect of a C-q."
94 (let ((term (getenv "TERM"))
95 hyphend)
96 (if term
97 (progn
98 ;; Strip off hyphen and what follows
99 (while (setq hyphend (string-match "[-_][^-_]+$" term))
100 (setq term (substring term 0 hyphend)))
101 (and (member term losing-terminal-types)
102 (enable-flow-control))))))
103
104 (provide 'flow-ctrl)
105
106 ;;; flow-ctrl.el ends here