Setter opp jar-bundling gradle plugin

Author: Dependency Admin

buildSrc/build.gradle.kts

@@ -1,5 +1,6 @@
 plugins {
     `kotlin-dsl`
+    `maven-publish`
 }
 
 repositories {
@@ -8,6 +9,21 @@ repositories {
 
 kotlin {
     jvmToolchain {
-        languageVersion.set(JavaLanguageVersion.of(17))
+        languageVersion.set(JavaLanguageVersion.of(21))
+    }
+}
+
+gradlePlugin {
+    plugins {
+        create("jar-bundling") {
+            id = "no.nav.tms.jar-bundling"
+            implementationClass = "JarBundling"
+        }
+    }
+}
+
+publishing {
+    repositories {
+        mavenLocal()
     }
 }

buildSrc/src/main/kotlin/jarBundling.kt

@@ -0,0 +1,72 @@
+import org.gradle.api.DefaultTask
+import org.gradle.api.Plugin
+import org.gradle.api.Project
+import org.gradle.api.plugins.JavaApplication
+import org.gradle.api.tasks.Input
+import org.gradle.api.tasks.TaskAction
+import org.gradle.jvm.tasks.Jar
+import java.io.File
+
+// Managed by tms-dependency-admin.
+
+abstract class JarBundling : Plugin<Project> {
+
+    override fun apply(target: Project) {
+
+        val configureTask = target.tasks.register("configureJar", ConfigureJarTask::class.java) {
+            this.application = target
+
+            val classes = target.tasks.named("classes")
+
+            dependsOn(classes)
+        }
+
+        val packageTask = target.tasks.register("packageJar", BundleJarsTask::class.java) {
+            this.application = target
+        }
+
+        target.tasks.withType(Jar::class.java) {
+            dependsOn(configureTask)
+            finalizedBy(packageTask)
+        }
+    }
+}
+
+abstract class ConfigureJarTask : DefaultTask() {
+    @Input
+    lateinit var application: Project
+
+    @TaskAction
+    fun action() {
+        application.tasks.withType(Jar::class.java) {
+
+            val javaApplication = application.extensions.getByType(JavaApplication::class.java)
+
+            val mainClassName = javaApplication.mainClass
+
+            archiveBaseName.set("app")
+            manifest {
+                val classpath = application.configurations.getByName("runtimeClasspath")
+                attributes["Main-Class"] = mainClassName
+                attributes["Class-Path"] = classpath.joinToString(separator = " ") {
+                    it.name
+                }
+            }
+        }
+    }
+}
+
+abstract class BundleJarsTask : DefaultTask() {
+    @Input
+    lateinit var application: Project
+
+    @TaskAction
+    fun action() {
+        val classpath = application.configurations.getByName("runtimeClasspath")
+
+        classpath.forEach {
+            val file = File("${application.layout.buildDirectory.get()}/libs/${it.name}")
+            if (!file.exists()) it.copyTo(file)
+        }
+    }
+}