Konf examples

[DanySK]

Hi,
where can I find a library of examples for konf? I'm trying to get past the base example presented, but I can't understand how to do more advanced stuff with the library.
I want to parse e.g.:

tests:
  - description: "latex guide should build"
    configuration:
      tasks: [ "buildLatex" ]
      options: [ "--debug" ]
    expectation:
      file_exists: [ "output.pdf" ]

I tried the following:

data class Configuration(val tasks: List<String>, val options: List<String>)
data class Expectation(val file_exists: List<String>)
data class Test(val description: String, val configuration: Configuration, val expectation: Expectation)
object Root : ConfigSpec("") {
    val tests by required<List<Test>>()
}
val testConfiguration = Config().from.yaml.inputStream(myInputStream)
println(testConfiguration[Root.tests])

But this causes:

java.lang.reflect.InvocationTargetException
	at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:490)
	at kotlin.reflect.jvm.internal.calls.CallerImpl$Constructor.call(CallerImpl.kt:41)
	at kotlin.reflect.jvm.internal.KCallableImpl.call(KCallableImpl.kt:106)
	at kotlin.reflect.jvm.internal.KCallableImpl.callDefaultMethod$kotlin_reflection(KCallableImpl.kt:152)
	at kotlin.reflect.jvm.internal.KCallableImpl.callBy(KCallableImpl.kt:110)
	at kotlin.reflect.full.KClasses.createInstance(KClasses.kt:283)
	at io.kotlintest.runner.jvm.JvmKt.instantiateSpec(jvm.kt:15)
	at io.kotlintest.runner.jvm.TestEngine.createSpec(TestEngine.kt:122)
	at io.kotlintest.runner.jvm.TestEngine.access$createSpec(TestEngine.kt:19)
	at io.kotlintest.runner.jvm.TestEngine$submitSpec$1.run(TestEngine.kt:105)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: com.uchuhimo.konf.NoSuchItemException: cannot find item tests in config
	at com.uchuhimo.konf.BaseConfig.getOrNull(BaseConfig.kt:248)
	at com.uchuhimo.konf.BaseConfig.getOrNull(BaseConfig.kt:245)
	at com.uchuhimo.konf.BaseConfig.getOrNull$default(BaseConfig.kt:188)
	at com.uchuhimo.konf.BaseConfig.get(BaseConfig.kt:168)
	at my.call.site

It's unclear to me why and how can I debug this.

Thanks!

[DanySK]

Same result with:

data class Configuration(val tasks: List<String>, val options: List<String>) {
    companion object : ConfigSpec("configuration") {
        val tasks by TestSpec.ConfigurationSpec.required<List<String>>()
        val options by TestSpec.ConfigurationSpec.optional<List<String>>(emptyList())
    }
}
data class Expectation(val file_exists: List<String>) {
    companion object : ConfigSpec("expectation") {
        val file_exists by TestSpec.ExpectationSpec.optional<List<String>>(emptyList())
    }
}
data class Test(val description: String, val configuration: Configuration, val expectation: Expectation) {
    companion object : ConfigSpec("") {
        val description by required<String>()
        val configuration by required<Configuration>()
        val expectation by required<Expectation>()
    }
}
object Root : ConfigSpec("") {
    val tests by required<List<Test>>()
}

I think the most unclear thing to me is how specifications get bound to objects besides built-in ones

[DanySK]

I'm closing this by myself: specs were not being loaded into the Config. Here is the solution for parsing the example I posted, for future reference should it be useful to anybody else:

data class Configuration(val tasks: List<String>, val options: List<String>) {
    companion object : ConfigSpec() {
        val tasks by TestSpec.ConfigurationSpec.required<List<String>>()
        val options by TestSpec.ConfigurationSpec.optional<List<String>>(emptyList())
    }
}
data class Expectation(val file_exists: List<String>) {
    companion object : ConfigSpec() {
        val file_exists by TestSpec.ExpectationSpec.optional<List<String>>(emptyList())
    }
}
data class Test(val description: String, val configuration: Configuration, val expectation: Expectation) {
    companion object : ConfigSpec() {
        val description by required<String>()
        val configuration by required<Configuration>()
        val expectation by required<Expectation>()
    }
}
object Root : ConfigSpec("") {
    val tests by required<List<Test>>()
}
val testConfiguration = Config({
                addSpec(Root)
                addSpec(Test)
                addSpec(Expectation)
                addSpec(Configuration)
            }).from.yaml.inputStream(it.open())
println(testConfiguration[Root.tests])

prints out:
[ Test(description=latex guide by M. Gates should build, configuration=Configuration(tasks=[buildLatex], options=[--debug]), expectation=Expectation(file_exists=[output.pdf])) ]