computationBroadcaster.getSource().beforeValueObtained();
                    try {
                        ValueSource<T, P> source = source();
                        sourceRef.set(source);
                        return source.obtain();
                    } finally {
                        computationBroadcaster.getSource().afterValueObtained();
                    }
                }

            main.getOutput().dir(singletonMap("builtBy", asList(apiMapping, defaultImports)), generatedDirectory)
        );

        extension.getUserManual().getResources().from(apiMapping);
        extension.getUserManual().getResources().from(defaultImports);
    }

    private void generateUserManual(Project project, TaskContainer tasks, ProjectLayout layout, GradleDocumentationExtension extension) {

        tasks.register("checkstyleApi", Checkstyle.class, task -> {
            task.source(extension.getDocumentedSource());
            // TODO: This is ugly
            task.setConfig(project.getResources().getText().fromFile(checkstyle.getConfigDirectory().file("checkstyle-api.xml")));
            task.setClasspath(layout.files());