Paper server update rework and support for offline mode.

src/main/kotlin/lgbt/mystic/foundation/concrete/SetupPaperServer.kt

@@ -16,7 +16,7 @@ open class SetupPaperServer : DefaultTask() {
 
   @get:Input
   @set:Option(option = "update", description = "Update Paper Server")
-  var shouldUpdatePaperServer = false
+  var shouldUpdatePaperServer = true
 
   private val paperVersionClient = PaperVersionClient()
 
@@ -58,6 +58,14 @@ open class SetupPaperServer : DefaultTask() {
   }
 
   private fun downloadLatestBuild(paperVersionGroup: String, paperJarFile: File) {
+    if (project.gradle.startParameter.isOffline) {
+      if (!paperJarFile.exists()) {
+        throw RuntimeException("Offline mode is enabled and Paper has not been downloaded.")
+      } else {
+        logger.lifecycle("Offline mode is enabled, skipping Paper update.")
+        return
+      }
+    }
     val builds = paperVersionClient.getVersionBuilds(paperVersionGroup)
     val build = builds.last()
     val download = build.downloads["application"]!!

src/main/kotlin/lgbt/mystic/foundation/concrete/extensions.kt

@@ -2,6 +2,7 @@ package lgbt.mystic.foundation.concrete
 
 import com.github.jengelman.gradle.plugins.shadow.tasks.ShadowJar
 import org.gradle.api.Project
+import org.gradle.api.tasks.TaskContainer
 import org.gradle.api.tasks.TaskOutputs
 import java.nio.file.FileSystems
 import java.nio.file.Path
@@ -9,41 +10,39 @@ import java.nio.file.Path
 internal fun Project.isPluginProject() = plugins.hasPlugin(ConcretePluginPlugin::class.java)
 internal fun Project.findPluginProjects() = allprojects.filter { project -> project.isPluginProject() }
 
+internal inline fun <reified T> TaskContainer.find(name: String) =
+  findByName(name) as T?
+
 internal val Project.shadowJarTask: ShadowJar?
-  get() =
+  get() = project.tasks.find<ShadowJar>("shadowJar")
-    if (project.tasks.names.contains("shadowJar"))
-      project.tasks.getByName("shadowJar") as ShadowJar
-    else null
 
 internal val Project.shadowJarOutputs: TaskOutputs?
   get() = shadowJarTask?.outputs
 
 internal val Project.concreteRootExtension: ConcreteExtension
-  get() {
+  get() = findTargetParent(
-    val direct = extensions.findByType(ConcreteExtension::class.java)
+    valid = { extensions.findByType(ConcreteExtension::class.java) != null },
-    if (direct != null) {
+    extract = { extensions.findByType(ConcreteExtension::class.java)!! },
-      return direct
+    error = { "Failed to find concrete root. Did you apply the concrete root plugin?" }
-    }
+  )
-
-    if (parent != null) {
-      return parent!!.concreteRootExtension
-    }
-
-    throw RuntimeException("Failed to find concrete extension. Did you apply the concrete root plugin?")
-  }
 
 internal val Project.concreteRootProject: Project
-  get() {
+  get() = findTargetParent(
-    val direct = extensions.findByType(ConcreteExtension::class.java)
+    valid = { extensions.findByType(ConcreteExtension::class.java) != null },
-    if (direct != null) {
+    extract = { this },
-      return this
+    error = { "Failed to find concrete root. Did you apply the concrete root plugin?" }
+  )
+
+internal fun <T> Project.findTargetParent(valid: Project.() -> Boolean, extract: Project.() -> T, error: () -> String): T {
+  if (valid(this)) {
+    return extract(this)
   }
 
   if (parent != null) {
-      return parent!!.concreteRootProject
+    return parent!!.findTargetParent(valid, extract, error)
   }
 
-    throw RuntimeException("Failed to find concrete root. Did you apply the concrete root plugin?")
+  throw RuntimeException(error())
 }
 
 internal fun TaskOutputs.allFilesRelativeToPath(root: Path): List<Path> = files.map { root.relativize(it.toPath()) }