add spigot build tools plugin

build.gradle.kts

@@ -89,6 +89,13 @@ gradlePlugin {
             implementationClass = "dev.mythicdrops.gradle.conventions.MythicDropsMavenPublishPlugin"
             tags.set(listOf("kotlin", "pixeloutlaw", "convention"))
         }
+        create("mythicDropsSpigotBuildTools") {
+            id = "dev.mythicdrops.gradle.spigot.build"
+            displayName = "mythicDropsGradleSpigotBuildTools"
+            description = "Builds and installs versions of Spigot to Maven Local."
+            implementationClass = "dev.mythicdrops.gradle.spigot.MythicDropsSpigotBuildToolsGradlePlugin"
+            tags.set(listOf("kotlin", "pixeloutlaw", "convention", "spigot"))
+        }
     }
 }
 

src/main/kotlin/dev/mythicdrops/gradle/spigot/DownloadSpigotBuildToolsTask.kt

@@ -0,0 +1,34 @@
+package dev.mythicdrops.gradle.spigot
+
+import org.gradle.api.DefaultTask
+import org.gradle.api.file.RegularFileProperty
+import org.gradle.api.provider.Property
+import org.gradle.api.tasks.Input
+import org.gradle.api.tasks.OutputFile
+import org.gradle.api.tasks.TaskAction
+import org.gradle.kotlin.dsl.withGroovyBuilder
+
+/**
+ * Task to download Spigot Build Tools to the build directory.
+ */
+abstract class DownloadSpigotBuildToolsTask : DefaultTask() {
+    @get:Input
+    abstract val downloadUrl: Property<String>
+
+    @get:OutputFile
+    abstract val downloadedJar: RegularFileProperty
+
+    init {
+        description = "Download Spigot BuildTools.jar into a build directory for use."
+        group = "spigot"
+        downloadUrl.convention("https://hub.spigotmc.org/jenkins/job/BuildTools/lastSuccessfulBuild/artifact/target/BuildTools.jar")
+        downloadedJar.convention(project.layout.buildDirectory.file("spigot-build-tools/BuildTools.jar"))
+    }
+
+    @TaskAction
+    fun download() {
+        ant.withGroovyBuilder {
+            "get"("src" to downloadUrl, "dest" to downloadedJar.get().asFile.toPath())
+        }
+    }
+}

src/main/kotlin/dev/mythicdrops/gradle/spigot/MythicDropsSpigotBuildToolsExtension.kt

@@ -0,0 +1,16 @@
+package dev.mythicdrops.gradle.spigot
+
+import org.gradle.api.provider.ListProperty
+import org.gradle.api.provider.Property
+
+interface MythicDropsSpigotBuildToolsExtension {
+    /**
+     * Should existing versions not be built?
+     */
+    val isSkipExistingVersions: Property<Boolean>
+
+    /**
+     * Which versions of Spigot to build and publish into [mavenLocal()].
+     */
+    val versions: ListProperty<String>
+}

src/main/kotlin/dev/mythicdrops/gradle/spigot/MythicDropsSpigotBuildToolsGradlePlugin.kt

@@ -0,0 +1,17 @@
+package dev.mythicdrops.gradle.spigot
+
+import org.gradle.api.Plugin
+import org.gradle.api.Project
+import org.gradle.kotlin.dsl.create
+
+class MythicDropsSpigotBuildToolsGradlePlugin : Plugin<Project> {
+    override fun apply(target: Project) {
+        target.extensions.create<MythicDropsSpigotBuildToolsExtension>("spigotBuildTools").apply {
+            isSkipExistingVersions.convention(true)
+            versions.convention(emptyList())
+        }
+
+        val downloadTask = target.tasks.create<DownloadSpigotBuildToolsTask>("downloadSpigotBuildTools")
+        target.tasks.create<RunSpigotBuildToolsTask>("runSpigotBuildTools").apply { dependsOn(downloadTask) }
+    }
+}

src/main/kotlin/dev/mythicdrops/gradle/spigot/RunSpigotBuildToolsTask.kt

@@ -0,0 +1,54 @@
+package dev.mythicdrops.gradle.spigot
+
+import org.gradle.api.DefaultTask
+import org.gradle.api.file.FileSystemOperations
+import org.gradle.api.file.RegularFileProperty
+import org.gradle.api.tasks.InputFile
+import org.gradle.api.tasks.TaskAction
+import org.gradle.kotlin.dsl.getByType
+import org.gradle.process.ExecOperations
+import java.nio.file.Paths
+import javax.inject.Inject
+
+abstract class RunSpigotBuildToolsTask
+    @Inject
+    constructor(
+        private val execOperations: ExecOperations,
+        private val fileSystemOperations: FileSystemOperations,
+    ) : DefaultTask() {
+        @get:InputFile
+        abstract val buildToolsJar: RegularFileProperty
+
+        init {
+            buildToolsJar.convention(project.layout.buildDirectory.file("spigot-build-tools/BuildTools.jar"))
+        }
+
+        @TaskAction
+        fun runSpigotBuildTools() {
+            val buildToolsExtension = project.extensions.getByType<MythicDropsSpigotBuildToolsExtension>()
+            buildToolsExtension.versions.getOrElse(emptyList()).forEach {
+                val mavenLocalDirectory = Paths.get(project.repositories.mavenLocal().url).toFile()
+                if (!mavenLocalDirectory.exists()) {
+                    logger.lifecycle("Creating Maven Local repository at ${mavenLocalDirectory.absolutePath}")
+                    mavenLocalDirectory.mkdirs()
+                }
+                val versionJar =
+                    mavenLocalDirectory.resolve("org/spigotmc/spigot/$it-R0.1-SNAPSHOT/spigot-$it-R0.1-SNAPSHOT.jar")
+                if (versionJar.exists()) {
+                    logger.lifecycle("Skipping $it as Spigot JAR is found at ${versionJar.absolutePath}")
+                    return@forEach
+                }
+                val jar = buildToolsJar.get().asFile
+                val versionDir = jar.parentFile.resolve(it)
+                fileSystemOperations.copy {
+                    from(jar)
+                    into(versionDir)
+                }
+                execOperations.javaexec {
+                    args(listOf("-jar", jar, "--rev", it))
+                    workingDir = versionDir.absoluteFile
+                    jvmArgs = listOf("-Xmx1024M")
+                }
+            }
+        }
+    }