No need for piping through perltidy, Perl::Tidy with the right config can do the trick.

Update:

#!/usr/bin/perl

use strict;
use warnings;

use Perl::Tidy;

my $input = <<'_EOT';
sub Tidy {
my ( $text, $cmdopt ) = @_;
my $tmpfile = "/tmp/Tidy.$$." . join( '', localtime()) ."tmp";
open my $th, ">$tmpfile" or die;
print $th $text or die;
close $th or die;

my $pid = open my $ph, "perltidy -st $cmdopt $tmpfile |" or die;
my $tidied = join '', <$ph>;
close $ph or die;
waitpid $pid, 0;
unlink $tmpfile;
return $tidied;
}
_EOT

my $output;

Perl::Tidy::perltidy(
        source            => \$input,
        destination       => \$output,
);

print $output;
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