Wheeee!

.

ho hum... Sorry, ran out of steam
##

use HTML::Template;

my $MAX_DEPTH = 3;
my $t = HTML::Template->new( filename          => "tmpl.tmpl", 
                             die_on_bad_params => 0,  
                             filter            => mk_filter($MAX_DEPTH));

# populate with recursive data...
$t->param( kids => recursive() );

print "Wheeee!";
print $t->output();
print "";

#
# create a filter for HTML::Template
#
sub mk_filter
{
    my $max   = shift;
    my $cur   = 0;

    return sub { 
        print STDERR "FILTERING:\n",${$_[0]},"\n\n";
        1 while ${$_[0]} =~ s#(.*?)#do_filter($max,$cur++,$1,$2)#sgei ;
        print STDERR "FILTERED:\n",${$_[0]},"\n\n";
    };
}

#
# Perform substitution
#
sub do_filter
{
    my($max,$cur, $file, $els) = @_;
    if($cur < $max) { 
        open my $f, $file or die $!; 
        local $/ = undef; 
        return <$f>;
    }
    else{
        return $els;
    }  
}

#
# just produce some recursive data...
#
sub recursive
{
    my $depth = shift || 0;
    my @kids  = ();
    return [] if $depth > $MAX_DEPTH;
    push @kids, { name=> $_, depth=>$depth, kids=> recursive($depth+1) }
        foreach (0...2 );
    return \@kids;
}