     # build system; such as documentation, compiled JavaScript artifact,
     # and every other piece of generated data that the system knows of.
     task "cleanup", "remove everything generated by build", (options) ->
-        knm = "clean-modules" of options
+        knm = "clean-modules" of options or Object()
         modules = options.modules or DEFAULT_MODULES
         artifact = options.artifact or DEFAULT_ARTIFACT
         documents = options.documents or DEFAULT_DOCUMENTS

        parameters.unshift "-w" if options.watch?
        watching = "Watching the %s directory".blue
        logger.info watching, library if options.watch?
        compiler = spawn "coffee", parameters
        compiler.stdout.pipe process.stdout
        compiler.stderr.pipe process.stderr
        compiler.on "exit", (status) ->
            failure = "Failed to compile library".red
            success = "Compiled library successfuly".green
            logger.error failure if status isnt 0

        parameters = [pattern, "Cakefile", index, "-o", documents]
        parameters.push "--github" if g = "git-hub-pages" of options
        logger.info "Publishing docs to GitHub pages".yellow if g
        assert _.isObject generator = spawn "groc", parameters
        assert _.isObject generator.stdout.pipe process.stdout
        assert _.isObject generator.stderr.pipe process.stderr
        assert _.isObject generator.on "exit", (status) ->
            failure = "Failed to generate documentation".red
            success = "Generated documentation successfuly".green
            logger.error failure if status isnt 0
