将JAR添加到SBT任务运行时

Im编写sbt任务以生成一些托管源,为此,Im使用 fast-classpath-scanner 提取全部 子类 的 scapegoat inspection class 。

我首先把它作为一个普通的 scala project 它确实起到了作用,但当试图将其作为 SBT任务 我有一个问题,那就是替罪羊罐子不在 类路径 ,因此类路径扫描程序失败。

我在 project/plugins.sbt 文件

//adding the generation task dependencies
libraryDependencies ++= Seq(
  "com.sksamuel.scapegoat" %% "scalac-scapegoat-plugin" % "1.3.4",
  "io.github.lukehutch" % "fast-classpath-scanner" % "2.18.1"
)

我在 build.sbt 文件:

//source generator task (simplified)
sourceGenerators in Compile += Def.task {
  //_root_ is needed because there is a sbt.io package in scope
  import _root_.io.github.lukehutch.fastclasspathscanner.FastClasspathScanner
  import _root_.io.github.lukehutch.fastclasspathscanner.matchprocessor.SubclassMatchProcessor
  import com.sksamuel.scapegoat.Inspection
  import scala.collection.mutable

  val inspectionClass = classOf[Inspection]
  val fastCPScanner = new FastClasspathScanner(inspectionClass.getPackage.getName)
  val inspections = mutable.ListBuffer.empty[Inspection]
  fastCPScanner
    .matchSubclassesOf(
      inspectionClass,
      new SubclassMatchProcessor[Inspection] {
        override def processMatch(matchingClass: Class[_ <: Inspection]): Unit = {
          inspections += matchingClass.newInstance()
          println("Hello World")
        }
      }
    ).scan()

  val lines = inspections.toList.zipWithIndex map {
    case (inspection, idx) => s"${inspections.text} -> ${idx}"
  }

  val scapegoatInspectionsFile = (sourceManaged in Compile).value / "scapegoat" / "inspections.scala"
  IO.writeLines(scapegoatInspectionsFile, lines)
  Seq(scapegoatInspectionsFile)
}.taskValue

注: 任务可以完美地编译和运行,问题是生成的文件是空的,因为扫描仪找不到任何检查。这可以确认,因为 print("Hello world") 中的语句 processMatch 方法未执行 (控制台中无输出) 。