;;; flow-ctrl.el --- help for lusers on cu(1) or ttys with wired-in ^S/^Q flow control
-;;; Copyright (C) 1990, 1991, 1994 Free Software Foundation, Inc.
+;; Copyright (C) 1990, 1991, 1994, 2002, 2003, 2004,
+;; 2005, 2006 Free Software Foundation, Inc.
;; Author Kevin Gallagher
;; Maintainer: FSF
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs; see the file COPYING. If not, write to
-;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+;; along with GNU Emacs; see the file COPYING. If not, write to the
+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
;;; Commentary:
-;;;; Terminals that use XON/XOFF flow control can cause problems with
-;;;; GNU Emacs users. This file contains Emacs Lisp code that makes it
-;;;; easy for a user to deal with this problem, when using such a
-;;;; terminal.
-;;;;
-;;;; To invoke these adjustments, a user need only invoke the function
-;;;; enable-flow-control-on with a list of terminal types in his/her own
-;;;; .emacs file. As arguments, give it the names of one or more terminal
-;;;; types in use by that user which require flow control adjustments.
-;;;; Here's an example:
-;;;;
-;;;; (enable-flow-control-on "vt200" "vt300" "vt101" "vt131")
-
-;;; Portability note: This uses (getenv "TERM"), and therefore probably
-;;; won't work outside of UNIX-like environments.
+;; Terminals that use XON/XOFF flow control can cause problems with
+;; GNU Emacs users. This file contains Emacs Lisp code that makes it
+;; easy for a user to deal with this problem, when using such a
+;; terminal.
+;;
+;; To invoke these adjustments, a user need only invoke the function
+;; enable-flow-control-on with a list of terminal types in his/her own
+;; .emacs file. As arguments, give it the names of one or more terminal
+;; types in use by that user which require flow control adjustments.
+;; Here's an example:
+;;
+;; (enable-flow-control-on "vt200" "vt300" "vt101" "vt131")
+
+;; Portability note: This uses (getenv "TERM"), and therefore probably
+;; won't work outside of UNIX-like environments.
;;; Code:
(defvar flow-control-c-q-replacement ?\036
"Character that replaces C-q, when flow control handling is enabled.")
+(put 'keyboard-translate-table 'char-table-extra-slots 0)
+
;;;###autoload
(defun enable-flow-control (&optional argument)
"Toggle flow control handling.
(set-input-mode t nil (nth 2 (current-input-mode)))
(if keyboard-translate-table
(progn
- (aset keyboard-translate-table flow-control-c-s-replacement
- flow-control-c-s-replacement)
- (aset keyboard-translate-table ?\^s ?\^s)
- (aset keyboard-translate-table flow-control-c-q-replacement
- flow-control-c-q-replacement)
- (aset keyboard-translate-table ?\^q ?\^q))))
+ (aset keyboard-translate-table flow-control-c-s-replacement nil)
+ (aset keyboard-translate-table ?\^s nil)
+ (aset keyboard-translate-table flow-control-c-q-replacement nil)
+ (aset keyboard-translate-table ?\^q nil))))
;; Turn flow control on.
;; Tell emacs to pass C-s and C-q to OS.
(set-input-mode nil t (nth 2 (current-input-mode)))
;; Initialize translate table, saving previous mappings, if any.
- (let ((the-table (make-string (max 128 (length keyboard-translate-table))
- 0)))
- (let ((i 0)
- (j (length keyboard-translate-table)))
- (while (< i j)
- (aset the-table i (elt keyboard-translate-table i))
- (setq i (1+ i)))
- (while (< i 128)
- (aset the-table i i)
- (setq i (1+ i))))
- (setq keyboard-translate-table the-table))
+ (cond ((null keyboard-translate-table)
+ (setq keyboard-translate-table
+ (make-char-table 'keyboard-translate-table nil)))
+ ((char-table-p keyboard-translate-table)
+ (setq keyboard-translate-table
+ (copy-sequence keyboard-translate-table)))
+ (t
+ (let ((the-table (make-char-table 'keyboard-translate-table nil)))
+ (let ((i 0)
+ (j (length keyboard-translate-table)))
+ (while (< i j)
+ (aset the-table i (elt keyboard-translate-table i))
+ (setq i (1+ i))))
+ (setq keyboard-translate-table the-table))))
;; Swap C-s and C-\
(aset keyboard-translate-table flow-control-c-s-replacement ?\^s)
(aset keyboard-translate-table ?\^s flow-control-c-s-replacement)
;; Swap C-q and C-^
(aset keyboard-translate-table flow-control-c-q-replacement ?\^q)
(aset keyboard-translate-table ?\^q flow-control-c-q-replacement)
- (message (concat
- "XON/XOFF adjustment for "
- (getenv "TERM")
- ": use "
- (single-key-description flow-control-c-s-replacement)
- " for C-s, and use "
- (single-key-description flow-control-c-q-replacement)
- " for C-q"))
+ (message "XON/XOFF adjustment for %s: use %s for C-s, and use %s for C-q"
+ (getenv "TERM")
+ (single-key-description flow-control-c-s-replacement)
+ (single-key-description flow-control-c-q-replacement))
(sleep-for 2))) ; Give user a chance to see message.
;;;###autoload
to get the effect of a C-q."
(let ((term (getenv "TERM"))
hyphend)
+ ;; Look for TERM in LOSING-TERMINAL-TYPES.
+ ;; If we don't find it literally, try stripping off words
+ ;; from the end, one by one.
+ (while (and term (not (member term losing-terminal-types)))
+ ;; Strip off last hyphen and what follows, then try again.
+ (if (setq hyphend (string-match "[-_][^-_]+$" term))
+ (setq term (substring term 0 hyphend))
+ (setq term nil)))
(if term
- (progn
- ;; Strip off hyphen and what follows
- (while (setq hyphend (string-match "[-_][^-_]+$" term))
- (setq term (substring term 0 hyphend)))
- (and (member term losing-terminal-types)
- (enable-flow-control))))))
+ (enable-flow-control))))
(provide 'flow-ctrl)
+;;; arch-tag: 0eb7b19e-0d93-4e0b-9ea2-72b574076a56
;;; flow-ctrl.el ends here