ValidateOptions.kt

package com.osacky.flank.gradle.validation

import com.osacky.flank.gradle.FladleConfig
import com.osacky.flank.gradle.FlankGradleExtension.Companion.FLANK_VERSION
import org.gradle.util.VersionNumber
import kotlin.reflect.full.memberProperties

fun validateOptionsUsed(
  config: FladleConfig,
  flank: String,
) {
  // if using snapshot version default to the latest known version of flank for validation checks
  val configFlankVersion = if (flank.toLowerCase().endsWith("snapshot")) FLANK_VERSION.toVersion() else flank.toVersion()

  config.getPresentProperties()
    .mapNotNull { property -> properties[property.name]?.let { property to it } }
    .forEach { (property, version) ->
      if (version > configFlankVersion) {
        throw IllegalStateException(
          "Option ${property.name} is available since flank $version, which is higher than used $configFlankVersion",
        )
      }
    }
}

private fun String.toVersion() = VersionNumber.parse(this)

private val properties =
  FladleConfig::class.memberProperties
    .asSequence()
    .map { it to it.getter.annotations }
    // we also need to exclude properties with default values to preserve backward compatibility
    // to be fixed
    .filter { it.second.any { annotation -> annotation is SinceFlank && !annotation.hasDefaultValue } }
    .map { it.first.name to it.second.filterIsInstance<SinceFlank>().first().version.toVersion() }
    .toMap()