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1 ;;; flow-ctrl.el --- help for lusers on cu(1) or ttys with wired-in ^S/^Q flow control
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2
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3 ;;; Copyright (C) 1990, 1991, 1994 Free Software Foundation, Inc.
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4
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5 ;; Author Kevin Gallagher
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6 ;; Maintainer: FSF
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7 ;; Adapted-By: ESR
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8 ;; Keywords: hardware
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9
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10 ;; This file is part of XEmacs.
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11
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12 ;; XEmacs is free software; you can redistribute it and/or modify it
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13 ;; under the terms of the GNU General Public License as published by
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14 ;; the Free Software Foundation; either version 2, or (at your option)
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15 ;; any later version.
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16
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17 ;; XEmacs is distributed in the hope that it will be useful, but
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18 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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20 ;; General Public License for more details.
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21
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22 ;; You should have received a copy of the GNU General Public License
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23 ;; along with XEmacs; see the file COPYING. If not, write to the
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24 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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25 ;; Boston, MA 02111-1307, USA.
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26
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27 ;;; Synched up with: FSF 19.28.
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28
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29 ;;; Commentary:
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30
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31 ;;;; Terminals that use XON/XOFF flow control can cause problems with
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32 ;;;; GNU Emacs users. This file contains Emacs Lisp code that makes it
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33 ;;;; easy for a user to deal with this problem, when using such a
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34 ;;;; terminal.
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35 ;;;;
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36 ;;;; To invoke these adjustments, a user need only invoke the function
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37 ;;;; enable-flow-control-on with a list of terminal types in his/her own
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38 ;;;; .emacs file. As arguments, give it the names of one or more terminal
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39 ;;;; types in use by that user which require flow control adjustments.
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40 ;;;; Here's an example:
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41 ;;;;
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42 ;;;; (enable-flow-control-on "vt200" "vt300" "vt101" "vt131")
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43
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44 ;;; Portability note: This uses (getenv "TERM"), and therefore probably
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45 ;;; won't work outside of UNIX-like environments.
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46
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47 ;;; Code:
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48
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49 (defvar flow-control-c-s-replacement ?\034
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50 "Character that replaces C-s, when flow control handling is enabled.")
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51 (defvar flow-control-c-q-replacement ?\036
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52 "Character that replaces C-q, when flow control handling is enabled.")
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53
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54 ;;;###autoload
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55 (defun enable-flow-control (&optional argument)
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56 "Toggle flow control handling.
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57 When handling is enabled, user can type C-s as C-\\, and C-q as C-^.
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58 With arg, enable flow control mode if arg is positive, otherwise disable."
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59 (interactive "P")
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60 (if (if argument
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61 ;; Argument means enable if arg is positive.
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62 (<= (prefix-numeric-value argument) 0)
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63 ;; No arg means toggle.
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64 (nth 1 (current-input-mode)))
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65 (progn
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66 ;; Turn flow control off, and stop exchanging chars.
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67 (set-input-mode t nil (nth 2 (current-input-mode)))
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68 (keyboard-translate flow-control-c-s-replacement nil)
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69 (keyboard-translate ?\^s nil)
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70 (keyboard-translate flow-control-c-q-replacement nil)
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71 (keyboard-translate ?\^q nil))
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72 ;; Turn flow control on.
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73 ;; Tell emacs to pass C-s and C-q to OS.
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74 (set-input-mode nil t (nth 2 (current-input-mode)))
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75 ;; Initialize translate table, saving previous mappings, if any.
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76 ;; Swap C-s and C-\
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77 (keyboard-translate flow-control-c-s-replacement ?\^s)
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78 (keyboard-translate ?\^s flow-control-c-s-replacement)
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79 ;; Swap C-q and C-^
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80 (keyboard-translate flow-control-c-q-replacement ?\^q)
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81 (keyboard-translate ?\^q flow-control-c-q-replacement)
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82 (message (concat
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83 "XON/XOFF adjustment for "
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84 (getenv "TERM")
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85 ": use C-\\ for C-s and use C-^ for C-q."))
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86 (sleep-for 2))) ; Give user a chance to see message.
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87
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88 ;;;###autoload
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89 (defun enable-flow-control-on (&rest losing-terminal-types)
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90 "Enable flow control if using one of a specified set of terminal types.
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91 Use `(enable-flow-control-on \"vt100\" \"h19\")' to enable flow control
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92 on VT-100 and H19 terminals. When flow control is enabled,
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93 you must type C-\\ to get the effect of a C-s, and type C-^
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94 to get the effect of a C-q.
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95
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96 This function has no effect unless the current device is a tty.
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97
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98 The tty terminal type is determined from the TERM environment variable.
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99 Trailing hyphens and everything following is stripped, so a TERM
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100 value of \"vt100-nam\" is treated the same as \"vt100\"."
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101 (and
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102 (eq (device-type) 'tty)
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103 (getenv "TERM")
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104 (member (replace-in-string (getenv "TERM") "[-_].*$" "")
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105 losing-terminal-types)
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106 (enable-flow-control)))
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107
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108 (provide 'flow-ctrl)
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109
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110 ;;; flow-ctrl.el ends here
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