88 lines
3.4 KiB
Perl
88 lines
3.4 KiB
Perl
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#!/usr/bin/env perl
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# $XTermId: sgrPushPop.pl,v 1.10 2018/08/02 21:09:46 tom Exp $
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# -----------------------------------------------------------------------------
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# this file is part of xterm, contributed by Dan Thompson
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#
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# Copyright 2018 by Thomas E. Dickey
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#
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# All Rights Reserved
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#
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# Permission is hereby granted, free of charge, to any person obtaining a
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# copy of this software and associated documentation files (the
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# "Software"), to deal in the Software without restriction, including
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# without limitation the rights to use, copy, modify, merge, publish,
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# distribute, sublicense, and/or sell copies of the Software, and to
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# permit persons to whom the Software is furnished to do so, subject to
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# the following conditions:
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#
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# The above copyright notice and this permission notice shall be included
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# in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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# IN NO EVENT SHALL THE ABOVE LISTED COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
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# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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#
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# Except as contained in this notice, the name(s) of the above copyright
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# holders shall not be used in advertising or otherwise to promote the
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# sale, use or other dealings in this Software without prior written
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# authorization.
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# -----------------------------------------------------------------------------
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use strict;
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use warnings;
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# This script demonstrates the utility of the [non-standard] SGR push/pop
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# control sequences. The ability to save (on a stack) the current SGR
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# attributes (fg/bg color, bold, etc.) and then later restore them allows
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# [SGR-containing] text from independent sources to be easily composed
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# together, without requiring any sort of global coordination.
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our (
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$pushSgr, $popSgr, $lib1Fmt,
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$lib2Fmt, $redOnBlack, $blackOnYellow,
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$blueOnGreen, $bg, $fg
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);
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$pushSgr = "\x1b[#{";
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$popSgr = "\x1b[#}";
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# lib1Fmt represents a "top-level" program, and controls the current "ambient"
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# fg/bg colors.
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$lib1Fmt = "\x1b[48;5;%sm\x1b[38;5;%sm%03.3d/%03.3d ";
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# lib2Fmt represents some intermediate library. Note that it contains no SGR
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# control sequences at all.
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$lib2Fmt = "Test stack: %s, %s, %s";
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# The following represent individual bits of colorized data that come from
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# other, "leaf-level" libraries.
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$redOnBlack = $pushSgr . "\x1b[1;31m\x1b[40m" . "redOnBlack" . $popSgr;
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$blackOnYellow = $pushSgr . "\x1b[30m\x1b[4;43m" . "blackOnYellow" . $popSgr;
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$blueOnGreen = $pushSgr . "\x1b[34m\x1b[42m" . "blueOnGreen" . $popSgr;
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printf $pushSgr;
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printf "\x1b[40;37mSetting ambient colors to white-on-black\n";
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printf $pushSgr;
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for ( $bg = 0 ; $bg < 16 ; $bg++ ) {
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for ( $fg = 0 ; $fg < 16 ; $fg++ ) {
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printf $pushSgr;
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printf $lib1Fmt, $fg, $bg, $fg, $bg;
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printf $lib2Fmt, $redOnBlack, $blackOnYellow, $blueOnGreen;
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print " something else";
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printf $popSgr; # keep the newline from bleeding color
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print "\n";
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}
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print "\n";
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}
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printf $popSgr;
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printf "The ambient colors should still be white-on-black.\n";
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printf $popSgr;
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printf "Now we should be back to whatever it was before we got here.\n";
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1;
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