def_extend_command

# File lib/irb/extend-command.rb, line 115
    def self.def_extend_command(cmd_name, cmd_class, load_file = nil, *aliases)
      case cmd_class
      when Symbol
        cmd_class = cmd_class.id2name
      when String
      when Class
        cmd_class = cmd_class.name
      end

      if load_file
        eval           def #{cmd_name}(*opts, &b)            require "#{load_file}"            arity = ExtendCommand::#{cmd_class}.instance_method(:execute).arity            args = []            if arity < 0              args << "*opts"              arity = -arity - 1            end            args.unshift *(1..arity).map {|i| "arg" + i.to_s }            args << "&block"            args = args.join(", ")            eval <<-"EOS2", binding, __FILE__, __LINE__+1              def #{cmd_name}(\#{args})                ExtendCommand::#{cmd_class}.execute(irb_context, \#{args})              end            EOS2            send :#{cmd_name}, *opts, &b          end, binding, __FILE__, __LINE__+1
      else
        eval           def #{cmd_name}(*opts, &b)            ExtendCommand::#{cmd_class}.execute(irb_context, *opts, &b)          end, binding, __FILE__, __LINE__+1
      end

      for ali, flag in aliases
        @ALIASES.push [ali, cmd_name, flag]
      end
    end