#!/usr/bin/perl

my %include = ();
my %included = ();

for my $text (<*.txt>) {
    open I, '<', $text || die "cannot read: $text";
    while (<I>) {
        if (/^include::/) {
            chomp;
            s/^include::\s*//;
            s/\[\]//;
            $include{$text}{$_} = 1;
            $included{$_} = 1;
        }
    }
    close I;
}

# Do we care about chained includes???
my $changed = 1;
while ($changed) {
    $changed = 0;
    while (my ($text, $included) = each %include) {
        for my $i (keys %$included) {
            # $text has include::$i; if $i includes $j
            # $text indirectly includes $j.
            if (exists $include{$i}) {
                for my $j (keys %{$include{$i}}) {
                    if (!exists $include{$text}{$j}) {
                        $include{$text}{$j} = 1;
                        $included{$j} = 1;
                        $changed = 1;
                    }
                }
            }
        }
    }
}

while (my ($text, $included) = each %include) {
    if (! exists $included{$text} &&
        (my $base = $text) =~ s/\.txt$//) {
        print "$base.html $base.xml : ", join(" ", keys %$included), "\n";
    }
}