fn column_widths(
    hunks: &[Hunk],
    lhs_mps: &[MatchedPos],
    rhs_mps: &[MatchedPos],
    max_lhs_src_line: LineNumber,
    max_rhs_src_line: LineNumber,
)  {
}

fn display_line_nums(
) -> (String, String) {
    let display_rhs_line_num: String = match rhs_line_num {
        Some(line_num) => {
            let s = format_line_num_padded(line_num, rhs_column_width);
            if rhs_lines_with_novel.contains(&line_num) {
                s.bright_green().to_string()
            } else {
                s
            }
        }
        None => format_missing_line_num(
            prev_rhs_line_num.unwrap_or_else(|| 10.into()),
            rhs_column_width,
        ),
    };

    (display_lhs_line_num, display_rhs_line_num)
}