abstract class EasierDefaultTask : DefaultTask() {
  @get:Inject
  abstract val objects: ObjectFactory
  @get:Inject
  abstract val providers: ProviderFactory
  @get:Inject
  abstract val layout: ProjectLayout

  inline fun <reified T> input(convention: T): PropertyDelegateProvider<EasierDefaultTask, ReadOnlyProperty<Any, Property<T>>> =
    PropertyDelegateProvider { thisRef: EasierDefaultTask, _ ->
      val value: Property<T> = thisRef.objects.property<T>().convention(convention)
      ReadOnlyProperty<Any, Property<T>> { _, _ -> value }
    }

  fun input(convention: RegularFile): PropertyDelegateProvider<EasierDefaultTask, ReadOnlyProperty<Any, RegularFileProperty>> =
    PropertyDelegateProvider { thisRef: EasierDefaultTask, _ ->
      val value: RegularFileProperty = thisRef.objects.fileProperty().convention(convention)
      ReadOnlyProperty { _: Any, _ -> value }
    }
}

abstract class MyTask : EasierDefaultTask() {

  @get:Input
  val stringInput: Property<String> by input(convention = "foo")
  @get:Input
  val boolInput: Property<Boolean> by input(convention = false)
  @get:InputFile
  val fileInput: RegularFileProperty by input(convention = layout.projectDirectory.file("input.txt"))

  @TaskAction
  fun doStuff() {
    //...
  }
}