Function shaped 

fn shaped(free: u32, minutes: u32, whole: bool, alone: bool, first: bool) -> u32

The part of a step worth starting in free minutes: the whole rest; for a long step, a quarter of an hour at least, leaving at least as much for later; a step done in one go (whole), all or nothing; one that needs a day of its own (alone), all of an untouched day.