# File lib/buildr/scala/doc.rb, line 87
      def generate(sources, target, options = {})
        cmd_args = [ '-d', target, (trace?(:vscaladoc) ? '-verbose' : ''),
          '-sourcepath', project.compile.sources.join(File::PATH_SEPARATOR) ]
        options.reject { |key, value| [:sourcepath, :classpath].include?(key) }.
          each { |key, value| value.invoke if value.respond_to?(:invoke) }.
          each do |key, value|
            case value
            when true, nil
              cmd_args << "-#{key}"
            when false
              cmd_args << "-no#{key}"
            when Hash
              value.each { |k,v| cmd_args << "-#{key}" << k.to_s << v.to_s }
            else
              cmd_args += Array(value).map { |item| ["-#{key}", item.to_s] }.flatten
            end
          end
        [:sourcepath, :classpath].each do |option|
          Array(options[option]).flatten.tap do |paths|
            cmd_args << "-#{option}" << paths.flatten.map(&:to_s).join(File::PATH_SEPARATOR) unless paths.empty?
          end
        end
        cmd_args += sources.flatten.uniq
        unless Buildr.application.options.dryrun
          info "Generating VScaladoc for #{project.name}"
          trace (['vscaladoc'] + cmd_args).join(' ')
          Java.load
          Java.org.scala_tools.vscaladoc.Main.main(cmd_args.to_java(Java.java.lang.String)) == 0 or
            fail 'Failed to generate VScaladocs, see errors above'
        end
      end