feat: Add /dh command

src/main/kotlin/gui/config/ManagedConfig.kt

@@ -15,7 +15,6 @@ import org.lwjgl.glfw.GLFW
 import kotlinx.serialization.encodeToString
 import kotlinx.serialization.json.JsonElement
 import kotlinx.serialization.json.JsonObject
-import kotlin.enums.enumEntries
 import kotlin.io.path.createDirectories
 import kotlin.io.path.readText
 import kotlin.io.path.writeText
@@ -135,7 +134,7 @@ abstract class ManagedConfig(
 		return StringIdentifiable.createCodec { x() }
 	}
 
-// TODO: wait on https://youtrack.jetbrains.com/issue/KT-73434
+	// TODO: wait on https://youtrack.jetbrains.com/issue/KT-73434
 //	protected inline fun <reified E> choice(
 //		propertyName: String,
 //		noinline default: () -> E
@@ -148,6 +147,8 @@ abstract class ManagedConfig(
 //			default
 //		)
 //	}
+	open fun onChange(option: ManagedOption<*>) {
+	}
 
 	protected fun duration(
 		propertyName: String,

src/main/kotlin/gui/config/ManagedOption.kt

@@ -6,7 +6,6 @@ import kotlinx.serialization.json.JsonObject
 import kotlin.properties.ReadWriteProperty
 import kotlin.reflect.KProperty
 import net.minecraft.text.Text
-import moe.nea.firmament.Firmament
 import moe.nea.firmament.util.ErrorUtil
 
 class ManagedOption<T : Any>(
@@ -28,7 +27,13 @@ class ManagedOption<T : Any>(
 	val descriptionTranslationKey = "firmament.config.${element.name}.${propertyName}.description"
 	val labelDescription: Text = Text.translatable(descriptionTranslationKey)
 
-	lateinit var value: T
+	private var actualValue: T? = null
+	var value: T
+		get() = actualValue ?: error("Lateinit variable not initialized")
+		set(value) {
+			actualValue = value
+			element.onChange(this)
+		}
 
 	override fun setValue(thisRef: Any?, property: KProperty<*>, value: T) {
 		this.value = value