class Byebug::HelpCommand

def execute
  if @match[1]
    args = @match[1].split
    cmds = @state.commands.select do |cmd|
      [cmd.help_command].flatten.include?(args[0])
    end
  else
    args = @match[1]
    cmds = []
  end
  unless cmds.empty?
    help = cmds.map{ |cmd| cmd.help(args) }.join
    help = help.split("\n").map{|l| l.gsub(/^ +/, '')}
    help.shift if help.first && help.first.empty?
    help.pop if help.last && help.last.empty?
    print help.join("\n")
  else
    if args and args[0]
      errmsg "Undefined command: \"#{args[0]}\".  Try \"help\"."
    else
      print "byebug help v#{Byebug::VERSION}\n" unless
        self.class.settings[:byebugtesting]
      print "Type 'help <command-name>' for help on a specific command\n\n"
      print "Available commands:\n"
      cmds = @state.commands.map{ |cmd| cmd.help_command }
      cmds = cmds.flatten.uniq.sort
      print columnize(cmds, self.class.settings[:width])
    end
  end
  print "\n"
end

def help(cmd)
  %{
    h[elp]\t\tprint this help
    h[elp] command\tprint help on command
  }
end

def help_command
  'help'
end

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