Detect the Kotlin version at runtime rather than hard-coding it.

CHANGELOG.md

@@ -2,7 +2,8 @@
 
 ## [Unreleased]
 ### Changed
-- Bump all dependencies to latest.
+- Bump required JVM from 11 to 17. ([#63](https://github.com/diffplug/atplug/pull/63))
+- Detect Kotlin version rather than harcode it. ([#64](https://github.com/diffplug/atplug/pull/64))
 
 ## [1.1.1] - 2024-07-06
 ### Changed

atplug-plugin-gradle/src/main/java/com/diffplug/atplug/tooling/gradle/PlugPlugin.kt

@@ -38,7 +38,11 @@ class PlugPlugin : Plugin<Project> {
 		project.plugins.apply(JavaPlugin::class.java)
 		val javaExtension = project.extensions.getByType(JavaPluginExtension::class.java)
 		val main = javaExtension.sourceSets.getByName(SourceSet.MAIN_SOURCE_SET_NAME)
-		val dep = project.dependencies.create("org.jetbrains.kotlin:kotlin-reflect:1.8.20")
+		val plugin =
+				project.plugins.findPlugin("org.jetbrains.kotlin.jvm")
+						as org.jetbrains.kotlin.gradle.plugin.KotlinPluginWrapper
+		val dep =
+				project.dependencies.create("org.jetbrains.kotlin:kotlin-reflect:${plugin.pluginVersion}")
 		val plugGenConfig =
 				project.configurations.create("plugGenerate") { plugGen: Configuration ->
 					plugGen.extendsFrom(

atplug-plugin-gradle/src/test/java/com/diffplug/atplug/tooling/PlugGeneratorTest.kt

@@ -23,7 +23,7 @@ class PlugGeneratorTest : ResourceHarness() {
 								true,
 								listOf(
 										"org.jetbrains.kotlinx:kotlinx-serialization-json:1.4.1",
-										"org.jetbrains.kotlin:kotlin-reflect:1.8.20"))
+										"org.jetbrains.kotlin:kotlin-reflect:2.1.0"))
 		val atplug_runtime = mutableSetOf(findRuntimeJar())
 		atplug_runtime.addAll(transitives)
 		return atplug_runtime

build.gradle

@@ -48,6 +48,7 @@ subprojects {
 		dependencies {
 			implementation "org.ow2.asm:asm:9.7.1"
 			implementation 'com.diffplug.gradle:goomph:4.2.0'
+			implementation 'org.jetbrains.kotlin:kotlin-gradle-plugin:2.1.0'
 			testImplementation 'org.assertj:assertj-core:3.27.3'
 		}
 		tasks.named('test') {