class Byebug::HelpCommand

def description
  %(h[elp][ <command>[ <subcommand>]]
    "help" alone prints this help.
    "help <command>" prints help on <command>.
    "help <command> <subcommand> prints help on <subcommand>.)
end

def execute
  if @match[1]
    args = @match[1].split
    cmds = @state.commands.select { |cmd| cmd.names.include?(args[0]) }
    if cmds.empty?
      return errmsg("Undefined command: \"#{args[0]}\". Try \"help\"")
    end
    return puts(cmds.map { |cmd| cmd.help(args[1..-1]) }.join("\n"))
  end
  puts "byebug help v#{VERSION}" unless Setting[:testing]
  puts "Type \"help <command-name>\" for help on a specific command\n"
  puts 'Available commands:'
  cmds = @state.commands.map { |cmd| cmd.names }.flatten.uniq.sort
  puts columnize(cmds, Setting[:width])
end

def names
  %w(help)
end

def regexp
  /^\s* h(?:elp)? (?:\s+(.+))? \s*$/x
end