create sbt plugin for avoid publish each scala versions

[xuwei-k]

WDYT? 👀

package kind_projector_sbt_plugin

import sbt._
import Keys._
import sbt.io.Using

object KindProjectorSbtPlugin extends AutoPlugin {

  override def requires: Plugins = sbt.plugins.JvmPlugin
  override def trigger = allRequirements

  object autoImport {
    val kindProjectorVersion = settingKey[String]("")
    val kindProjectorSourceURL = settingKey[String]("")
  }

  import autoImport._

  override def extraProjects: Seq[Project] = Seq(extraProject)

  lazy val extraProject: Project =
    Project("kind-projector", file(".kind-projector"))
      .settings(
        // disable publish tasks
        publishArtifact := false,
        publish := {},
        publishLocal := {},
        skip in publish := true,
        // disable sbt-pgp publish tasks as well
        // https://github.com/sbt/sbt-pgp/blob/v1.1.1/pgp-plugin/src/main/scala/com/typesafe/sbt/pgp/PgpKeys.scala#L41-L42
        TaskKey[Unit]("publishSigned") := {},
        TaskKey[Unit]("publishLocalSigned") := {},
        libraryDependencies += scalaOrganization.value % "scala-compiler" % scalaVersion.value,
        kindProjectorVersion := "0.10.3",
        kindProjectorSourceURL := {
          s"https://repo1.maven.org/maven2/org/typelevel/kind-projector_2.13/${kindProjectorVersion.value}/kind-projector_2.13-${kindProjectorVersion.value}-sources.jar"
        },
        sourceGenerators in Compile += task {
          val dir = (sourceManaged in Compile).value
          // TODO cache source jar?
          Using.urlInputStream(url(kindProjectorSourceURL.value)) { stream =>
            IO.unzipStream(stream, dir, _.endsWith(".scala"))
          }
          (dir ** "*.scala").get
        },
        resourceGenerators in Compile += task {
          val dir = (resourceManaged in Compile).value
          Using.urlInputStream(url(kindProjectorSourceURL.value)) { stream =>
            IO.unzipStream(stream, dir, _.endsWith(".xml"))
          }
          (dir ** "*.xml").get
        }
      )
      .disablePlugins(KindProjectorSbtPlugin) 


  override def projectSettings: Seq[Def.Setting[_]] = Def.settings(
    scalacOptions ++= {
      val jar = (Keys.`package` in (extraProject, Compile)).value
      val addPlugin = "-Xplugin:" + jar.getAbsolutePath
      // add plugin timestamp to compiler options to trigger recompile of
      // main after editing the plugin. (Otherwise a 'clean' is needed.)
      val dummy = "-Jdummy=" + jar.lastModified
      Seq(addPlugin, dummy)
    }
  )
}

[lrytz]

A downside is that this only supports sbt. I'd prefer publishing fully cross-versioned builds to maven. I've started using https://github.com/olafurpg/sbt-ci-release lately and it makes the process quite painless.