Function parts_list 

pub fn parts_list(
    reader: &Reader<'_>,
    file: &str,
    args: &DrawingArgs,
) -> GeopResult<Vec<PartsListLine>>

The bill of materials of the part reader reads, the program of the file file, as a drawing lists it (see PartsListLine): flat, each part and wire once with its count. Empty if args asks for none.