Initial commit

buildSrc/src/main/kotlin/ResolveSourcesJars.kt

@@ -0,0 +1,43 @@
+import org.gradle.api.DefaultTask
+import org.gradle.api.artifacts.Configuration
+import org.gradle.api.artifacts.result.ResolvedArtifactResult
+import org.gradle.api.artifacts.result.ResolvedDependencyResult
+import org.gradle.api.file.DirectoryProperty
+import org.gradle.api.provider.Property
+import org.gradle.api.tasks.InputFiles
+import org.gradle.api.tasks.OutputDirectory
+import org.gradle.api.tasks.TaskAction
+import org.gradle.jvm.JvmLibrary
+import org.gradle.kotlin.dsl.property
+import org.gradle.language.base.artifact.SourcesArtifact
+
+open class ResolveSourcesJars : DefaultTask() {
+  @get:InputFiles
+  val configuration: Property<Configuration> = project.objects.property()
+
+  @get:OutputDirectory
+  val outputDir: DirectoryProperty = project.objects.directoryProperty()
+
+  @TaskAction
+  @Suppress("UnstableApiUsage", "unused")
+  fun resolve() {
+    val componentIds = configuration.get().incoming.resolutionResult.allDependencies.map {
+      (it as ResolvedDependencyResult).selected.id
+    }
+
+    val resolutionResult = project.dependencies.createArtifactResolutionQuery()
+      .forComponents(componentIds)
+      .withArtifacts(JvmLibrary::class.java, SourcesArtifact::class.java)
+      .execute()
+
+    val resolvedJars = resolutionResult.resolvedComponents
+      .flatMap { it.getArtifacts(SourcesArtifact::class.java) }
+      .map { (it as ResolvedArtifactResult).file }
+
+    // copying to an output dir because I don't know how else to describe task outputs
+    project.sync {
+      from(resolvedJars)
+      into(outputDir)
+    }
+  }
+}