58 lines
1.6 KiB
Plaintext
58 lines
1.6 KiB
Plaintext
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#!/usr/bin/env perl
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# Copyright (C) 2013 Luke Shumaker <lukeshu@parabola.nu>
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#
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# License: GNU GPLv3+
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#
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# This file is part of Parabola.
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#
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# Parabola is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# Parabola is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with Parabola. If not, see <http://www.gnu.org/licenses/>.
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use warnings;
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use strict;
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use constant BUFFER_SIZE => 40;
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binmode(STDIN);
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binmode(STDOUT);
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exit(1) if ($#ARGV != 0);
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my $indent = $ARGV[0];
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# 0: no indent has been printed for this line, an indent WILL need to be printed
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# 1: an indent needs to be printed for this line IFF there is any more output on it
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# 2: no indent (currently) needs to be printed for this line
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my $print_indent = 0;
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my $buffer;
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my $size;
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my $c;
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while (1) {
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$size = sysread(STDIN, $buffer, BUFFER_SIZE);
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last if ($size < 1);
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for (0..$size-1) {
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$c = substr($buffer, $_, 1);
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if ($c eq "\n") {
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syswrite(STDOUT, $indent) if ($print_indent == 0);
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syswrite(STDOUT, $c, 1);
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$print_indent = 0;
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} elsif ($c eq "\r") {
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syswrite(STDOUT, $c, 1);
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$print_indent = 1 if ($print_indent == 2);
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} else {
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syswrite(STDOUT, $indent) if ($print_indent < 2);
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syswrite(STDOUT, $c, 1);
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$print_indent = 2;
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}
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}
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}
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