resize.sh revision 4419d26b 
1#!/bin/sh
2# $XTermId: resize.sh,v 1.22 2022/02/13 14:36:28 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 screen size, then resize the terminal to the nominal
35# screen width/height, and restore the size.
36
37ESC=""
38CSI="${ESC}["
39CMD='/bin/echo'
40OPT='-n'
41SUF=''
42TMP=`(mktemp) 2>/dev/null` || TMP=/tmp/xterm$$
43eval '$CMD $OPT >$TMP || echo fail >$TMP' 2>/dev/null
44{ test ! -f $TMP || test -s $TMP; } &&
45for verb in "printf" "print" ; do
46    rm -f $TMP
47    eval '$verb "\c" >$TMP || echo fail >$TMP' 2>/dev/null
48    if test -f $TMP ; then
49	if test ! -s $TMP ; then
50	    CMD="$verb"
51	    OPT=
52	    SUF='\c'
53	    break
54	fi
55    fi
56done
57rm -f $TMP
58
59exec </dev/tty
60old=`stty -g`
61stty raw -echo min 0  time 5
62
63$CMD $OPT "${CSI}18t${SUF}" > /dev/tty
64IFS=';' read junk high wide
65
66$CMD $OPT "${CSI}19t${SUF}" > /dev/tty
67IFS=';' read junk maxhigh maxwide
68
69stty $old
70
71wide=`echo "$wide"|sed -e 's/t.*//'`
72maxwide=`echo "$maxwide"|sed -e 's/t.*//'`
73original=${CSI}8\;${high}\;${wide}t${SUF}
74
75test "$maxwide" = 0 && maxwide=`expr "$wide" \* 2`
76test "$maxhigh" = 0 && maxhigh=`expr "$high" \* 2`
77
78trap '$CMD $OPT "$original" >/dev/tty; exit 1' 1 2 3 15
79trap '$CMD $OPT "$original" >/dev/tty' 0
80
81w=$wide
82h=$high
83a=1
84while true
85do
86#	sleep 1
87	echo "resizing to $h by $w"
88	$CMD $OPT "${CSI}8;${h};${w}t" >/dev/tty
89	if test $a = 1 ; then
90		if test "$w" = "$maxwide" ; then
91			h=`expr "$h" + "$a"`
92			if test "$h" = "$maxhigh" ; then
93				a=-1
94			fi
95		else
96			w=`expr "$w" + "$a"`
97		fi
98	else
99		if test "$w" = "$wide" ; then
100			h=`expr "$h" + "$a"`
101			if test "$h" = "$high" ; then
102				a=1
103			fi
104		else
105			w=`expr "$w" + "$a"`
106		fi
107	fi
108done
109