module CommandLineBoss::HelpOption

def add_banner
  return unless banner
  parser.banner = banner
end

def add_footer
  return unless footer
  parser.separator footer
end

def add_header
  return unless header
  parser.separator header
end

def banner = nil

def define_help_option
  parser.on('-h', '--help', 'Show this message') do
    puts parser.help
    exit
  end
end

def define_options
  add_banner
  add_header
  super
  add_footer
end

def footer = nil

def header = nil