class Lookbook::FileSource::Component

def end_line
  line_count = source_lines.size
  if lines_around_highlight && @highlight_lines.any?
    last = @highlight_lines.last + lines_around_highlight
    (last <= line_count) ? last : line_count
  else
    (@end_line && (@end_line <= line_count)) ? @end_line : line_count
  end
end