class Lookbook::Error

def source_code
  lines = source_code_lines
  if lines.present? && line_number.is_a?(Integer)
    start_line = source_code_start_line(lines)
    end_line = source_code_end_line(lines)
    highlighted_line = source_code_highlighted_line(lines)
    line_count = end_line - start_line
    relevant_lines = lines.slice(start_line - 1, line_count + 1)
    if relevant_lines.present?
      empty_start_lines = 0
      relevant_lines.each do |line|
        break unless line.strip.empty?
        empty_start_lines += 1
      end
      {
        code: relevant_lines.join("\n").lstrip,
        start_line: start_line - empty_start_lines,
        end_line: end_line - empty_start_lines,
        highlighted_line: highlighted_line - empty_start_lines
      }
    end
  end
end