run_rdoc (Gem::DocManager)

    # File lib/rubygems/doc_manager.rb, line 155
      def run_rdoc(*args)
        args << @spec.rdoc_options
        args << self.class.configured_args
        args << '--quiet'
        args << @spec.require_paths.clone
        args << @spec.extra_rdoc_files
        args << '--title' << "#{@spec.full_name} Documentation"
        args = args.flatten.map do |arg| arg.to_s end

        if self.class.rdoc_version >= Gem::Version.new('2.4.0') then
          args.delete '--inline-source'
          args.delete '--promiscuous'
          args.delete '-p'
          args.delete '--one-file'
          # HACK more
        end

        r = RDoc::RDoc.new

        old_pwd = Dir.pwd
        Dir.chdir(@spec.full_gem_path)
        begin
          r.document args
        rescue Errno::EACCES => e
          dirname = File.dirname e.message.split("-")[1].strip
          raise Gem::FilePermissionError.new(dirname)
        rescue RuntimeError => ex
          alert_error "While generating documentation for #{@spec.full_name}"
          ui.errs.puts "... MESSAGE:   #{ex}"
          ui.errs.puts "... RDOC args: #{args.join(' ')}"
          ui.errs.puts "\t#{ex.backtrace.join "\n\t"}" if
          Gem.configuration.backtrace
          ui.errs.puts "(continuing with the rest of the installation)"
        ensure
          Dir.chdir(old_pwd)
        end
      end