@InputDirectory
                Path inputDir
                @OutputFile
                Path outputFile
                @OutputDirectory
                Path outputDir

                @TaskAction
                def go() {
                    outputFile.toFile().text = inputFile.toFile().text
                    inputDir.toFile().listFiles().each { f -> outputDir.resolve(f.name).toFile().text = f.text }

        buildFile << """
            task incrementalTask(type: MyIncrementalTask) {
                inputDir = file('src')
            }

            class MyIncrementalTask extends DefaultTask {
                ${supportsInputChanges ? "@Incremental" : ""}
                @InputDirectory
                def File inputDir
                @TaskAction
                void doSomething(${parameterType} inputs) {}

        readingList.add(toKatakana(text));
        return readingList;
    }

    protected String toKatakana(final String inputStr) throws IOException {
        final StringBuilder kanaBuf = new StringBuilder();

        final Reader rd = new StringReader(inputStr);
        try (TokenStream stream = createTokenStream(rd)) {
            if (stream == null) {
                throw new IOException("Invalid tokenizer.");