ruby

# File lib/rubygems.rb, line 786
  def self.ruby
    if @ruby.nil? then
      @ruby = File.join(RbConfig::CONFIG['bindir'],
                        "#{RbConfig::CONFIG['ruby_install_name']}#{RbConfig::CONFIG['EXEEXT']}")

      @ruby = "\"#{@ruby}\"" if @ruby =~ /\s/
    end

    @ruby
  end