I like this, a lot. It could be a CPAN module if someone (push me and I'll do it) provided a mechanism where you could specify the output. Here's how I got around the tie-untie reference problem: 
package Filter::Handle::Tie;
use vars qw/@ISA/;
use Tie::Handle; @ISA = qw/Tie::Handle/;

sub TIEHANDLE {
    my $class = shift;
    my $fh    = shift;
    bless { fh => $fh }, $class;
}

sub PRINT {
    my $self   = shift;
    my $fh     = *{ $self->{fh} };
    my($file, $line) = (caller)[1,2];
    print $fh sprintf "%s:%d - %s\n", $file, $line, join ' ', @_;
}

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This avoids the deep recursion by not printing to a tied filehandle -- it's copied by dereference before printing to it.

Maybe users could pass in a subref with stuff they want to print instead. Interesting idea.

In reply to RE: Filehandle Filter by chromatic
in thread Filehandle Filter by btrott

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