#! perl

sub on_keyboard_command {
   my ($self, $cmd) = @_;

   $cmd eq "selection:rot13"
      and $self->selection (map { y/A-Za-z/N-ZA-Mn-za-m/; $_ } $self->selection);

   ()
}

sub on_sel_extend {
   my ($self) = @_;
   warn $self->selection;
   ()
}