validate_pom_sbt2.sbt

@transient
val validatePom = taskKey[Unit]("")

def checkPom(pom: scala.xml.Node): List[String] = {
  List(
    "modelVersion",
    "groupId",
    "artifactId",
    "version",
    "packaging",
    "name",
    "description",
    "url",
    "licenses",
    "developers"
  ).flatMap { tag =>
    if ((pom \ tag).isEmpty) List("<" + tag + ">") else Nil
  } ::: List(("scm", "url"), ("scm", "connection")).flatMap { case (tag1, tag2) =>
    if ((pom \ tag1 \ tag2).isEmpty) List("<" + tag1 + "><" + tag2 + ">") else Nil
  }
}

validatePom := {
  val s = streams.value
  if ((publish / skip).value) {
    s.log.info(s"[name = ${name.value}][base = ${baseDirectory.value}] skip validatePom task")
    None
  } else {
    makePom.?.value.map { ff =>
      val f = fileConverter.value.toPath(ff).toFile
      val errors = checkPom(scala.xml.XML.loadFile(f))
      errors.foreach { e =>
        s.log.error("missing tag " + e)
      }
      if (errors.isEmpty) {
        s.log.info(s"[name = ${name.value}][base = ${baseDirectory.value}] success validatePom")
      }
      errors.isEmpty
    }
  }
}