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90 lines
3.5 KiB
EmacsLisp
90 lines
3.5 KiB
EmacsLisp
;;; flow-ctrl.el --- help for lusers on cu(1) or terminals with wired-in ^S/^Q flow control
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;;; Copyright (C) 1990 Free Software Foundation, Inc.
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;;; Copyright (C) 1991 Kevin Gallagher
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;;; Adapted for Emacs 19 by Eric S. Raymond <eric@snark.thyrsus.com>
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;;;
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;;; GNU Emacs is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY. No author or distributor accepts
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;;; RESPONSIBILITY TO anyone for the consequences of using it or for
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;;; whether it serves any particular purpose or works at all, unless
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;;; he says so in writing. Refer to the GNU Emacs General Public
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;;; License for full details.
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;;;
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;;; Everyone is granted permission to copy, modify and redistribute
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;;; GNU Emacs, but only under the conditions described in the GNU
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;;; Emacs General Public License. A copy of this license is supposed
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;;; to have been given to you along with GNU Emacs so you can know
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;;; your rights and responsibilities. It should be in a file named
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;;; COPYING. Among other things, the Copyright notice and this notice
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;;; must be preserved on all copies.
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;;;
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;;;; Terminals that use XON/XOFF flow control can cause problems with
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;;;; GNU Emacs users. This file contains elisp code that makes it
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;;;; easy for a user to deal with this problem, when using such a
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;;;; terminal.
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;;;;
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;;;; To invoke these adjustments, a user need only invoke the function
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;;;; evade-flow-control-on with a list of terminal types in his/her own
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;;;; .emacs file. As arguments, give it the names of one or more terminal
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;;;; types in use by that user which require flow control adjustments.
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;;;; Here's an example:
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;;;;
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;;;; (evade-flow-control-on "vt200" "vt300" "vt101" "vt131")
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;;; Portability note: This uses (getenv "TERM"), and therefore probably
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;;; won't work outside of UNIX-like environments.
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(defun evade-flow-control ()
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"Enable use of flow control; let user type C-s as C-\ and C-q as C-^."
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(interactive)
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;; Tell emacs to pass C-s and C-q to OS.
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(set-input-mode nil t)
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;; Initialize translate table, saving previous mappings, if any.
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(let ((the-table (make-string 128 0)))
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(let ((i 0)
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(j (length keyboard-translate-table)))
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(while (< i j)
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(aset the-table i (elt keyboard-translate-table i))
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(setq i (1+ i)))
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(while (< i 128)
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(aset the-table i i)
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(setq i (1+ i))))
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(setq keyboard-translate-table the-table))
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;; Swap C-s and C-\
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(aset keyboard-translate-table ?\034 ?\^s)
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(aset keyboard-translate-table ?\^s ?\034)
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;; Swap C-q and C-^
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(aset keyboard-translate-table ?\036 ?\^q)
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(aset keyboard-translate-table ?\^q ?\036)
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(message (concat
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"XON/XOFF adjustment for "
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(getenv "TERM")
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": use C-\\ for C-s and use C-^ for C-q."))
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(sleep-for 2)) ; Give user a chance to see message.
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(defun evade-flow-control-memstr= (e s)
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(cond ((null s) nil)
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((string= e (car s)) t)
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(t (evade-flow-control-memstr= e (cdr s)))))
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;;;###autoload
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(defun evade-flow-control-on (&rest losing-terminal-types)
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"Enable flow control if using one of a specified set of terminal types.
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Use `(evade-flow-control-on \"vt100\" \"h19\")' to enable flow control
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on VT-100 and H19 terminals. When flow control is enabled,
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you must type C-\\ to get the effect of a C-s, and type C-^
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to get the effect of a C-q."
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(let ((term (getenv "TERM"))
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hyphend)
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;; Strip off hyphen and what follows
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(while (setq hyphend (string-match "[-_][^-_]+$" term))
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(setq term (substring term 0 hyphend)))
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(and (evade-flow-control-memstr= term losing-terminal-types) (evade-flow-control)))
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)
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(provide 'flow-ctrl)
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;;; flow-ctrl.el ends here
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