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