Note to self: more syntax can make things clean

ncurses_window_update.pl

# this
if($data_pos < @data) {
	# data on line
	$self->window()->addstr($data[$data_pos]);
} else {
	# tilde on line
	$self->window()->addstr("~");
}

# or this

$self->window()->addstr($data[$data_pos] // "~");