class Byebug::Command

def format_subcmds
  cmd_name = names.join("|")
  s = "\n"                                     \
      "--\n"                                   \
      "List of \"#{cmd_name}\" subcommands:\n" \
      "--\n"
  width = self::Subcommands.map(&:name).max_by(&:size).size
  for subcmd in self::Subcommands do
    s += sprintf \
      "%s %-#{width}s -- %s\n", cmd_name, subcmd.name, subcmd.short_help
  end
  return s
end