For this I'll refer to a previous node 349582 and especially tye's response to that node 350948 in which he describes a "next" method iterator.

I've since used the guts of this "next" method (Big Thanks to tye) in a module I'm writing. I'm wanting to amend that method so that you can specify it to only go so deep into the directory tree. Here is the code:

sub this_deep {
    my ($self, $depth) = @_;
    $depth = -1 unless @_ > 1;
    $self->{depth} = $depth;
}

sub next {
    my $self = shift;
    while( 1 ) {
        if (  @{ $self->{output} }  ) {
            my $line = shift @{ $self->{output} };
            return $line;
        }
        if ( ! @{ $self->{dirs} } ) {
            return;
        }
        my $dir = shift @{ $self->{dirs} };
        if (-d $dir) {
            if(  opendir( DIR, $dir )  ) {
                map {
                    my $file = $_;
                    my $fullfile = File::Spec->catfile( $dir, $file );
                    if (-d $fullfile && ($self->{level} <= $self->{dep
+th} || $self->{depth} == -1)) {
                        push (@{ $self->{dirs} }, $fullfile);
                    }
                } File::Spec->no_upwards( readdir(DIR) );
                closedir DIR;
                
            } else {
                warn "\a\a\aopendir FAILED, $dir: $!";
            }
        } else {
            warn "\a\a\aNOT A DIRECTORY: $dir\n";
        }
    }
}
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As you can see in this code I've put in the checks for the $self->{level} in that it will only push to the $self->{dirs} stack if the current level is below the specified depth or depth == -1 (if depth is set to -1 it will fully recurse the directory tree)

I'm having trouble building into this how to track the depth to ensure it only goes as far as specified. Any suggestions?

Update: I should add that what makes this tricky is the code makes it go DOWN a directory tree first before starting on the next level, not across the directory tree as is usually the case.

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