util.gradle

apply plugin: UtilPlugin

class UtilPlugin implements Plugin<Project> {

	void apply(Project project) {
		project.convention.plugins.util = new UtilPluginConvention(project)
	}

}

class UtilPluginConvention {

	UtilPluginConvention(Project project)  {
		_project = project
	}

	boolean exists(String fileName) {
		File file = _project.file(fileName)

		file.exists()
	}

	void mkdirs(String dirName) {
		File file = _project.file(dirName)

		file.mkdirs()
	}

	void move(String sourceFileName, String destinationFileName) {
		File sourceFile = _project.file(sourceFileName)
		File destinationFile = _project.file(destinationFileName)

		mkdirs(destinationFile.parent)

		sourceFile.renameTo(destinationFileName)
	}

	private Project _project

}