1#!/bin/sh
2# $XTermId: title.sh,v 1.26 2022/04/25 08:19:38 tom Exp $
3# -----------------------------------------------------------------------------
4# this file is part of xterm
5#
6# Copyright 1999-2021,2022 by Thomas E. Dickey
7#
8#                         All Rights Reserved
9#
10# Permission is hereby granted, free of charge, to any person obtaining a
11# copy of this software and associated documentation files (the
12# "Software"), to deal in the Software without restriction, including
13# without limitation the rights to use, copy, modify, merge, publish,
14# distribute, sublicense, and/or sell copies of the Software, and to
15# permit persons to whom the Software is furnished to do so, subject to
16# the following conditions:
17#
18# The above copyright notice and this permission notice shall be included
19# in all copies or substantial portions of the Software.
20#
21# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
22# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
23# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
24# IN NO EVENT SHALL THE ABOVE LISTED COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
25# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
26# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
27# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
28#
29# Except as contained in this notice, the name(s) of the above copyright
30# holders shall not be used in advertising or otherwise to promote the
31# sale, use or other dealings in this Software without prior written
32# authorization.
33# -----------------------------------------------------------------------------
34# Obtain the current title of the window, set up a simple clock which runs
35# until this script is interrupted, then restore the title.
36
37ESC=""
38CSI="${ESC}["
39CMD='/bin/echo'
40OPT='-n'
41SUF=''
42: "${TMPDIR=/tmp}"
43TMP=`(mktemp "$TMPDIR/xterm.XXXXXXXX") 2>/dev/null` || TMP="$TMPDIR/xterm$$"
44eval '$CMD $OPT >$TMP || echo fail >$TMP' 2>/dev/null
45{ test ! -f "$TMP" || test -s "$TMP"; } &&
46for verb in "printf" "print" ; do
47    rm -f "$TMP"
48    eval '$verb "\c" >$TMP || echo fail >$TMP' 2>/dev/null
49    if test -f "$TMP" ; then
50	if test ! -s "$TMP" ; then
51	    CMD="$verb"
52	    OPT=
53	    SUF='\c'
54	    break
55	fi
56    fi
57done
58rm -f "$TMP"
59
60exec </dev/tty
61old=`stty -g`
62stty raw -echo min 0  time 5
63
64$CMD $OPT "${CSI}21t${SUF}" > /dev/tty
65read -r original
66
67stty $old
68
69# We actually get this terminated by an <esc>backslash, but the backslash
70# is lost.  We may lose doublequote characters when restoring the title,
71# depending on the shell.
72original=`echo "$original" |sed -e 's/^...//' -e 's/.$//'`
73original=${ESC}]2\;"${original}"${SUF}
74
75trap '$CMD $OPT "$original" >/dev/tty; exit 1' 1 2 3 15
76trap '$CMD $OPT "$original" >/dev/tty' 0
77
78while true
79do
80	sleep 1
81	$CMD $OPT "${ESC}]2;`date`" >/dev/tty
82done
83