Packaging a compiler plugin with dependencies (requires sbt-assembly)

build.sbt

// can be used like this:
// addCompilerPlugin("local.whatever" %% "whatever-plugin" % "0.1-SNAPSHOT" classifier "assembly" cross CrossVersion.patch)

name := "whatever-plugin"

organization := "local.whatever"

scalaVersion := "2.12.0"
crossScalaVersions := Seq("2.12.0", "2.12.1", "2.11.8", "2.11.7", "2.11.6")

libraryDependencies ++= Seq(
  scalaOrganization.value % "scala-compiler" % scalaVersion.value % "provided",
  "org.scala-lang.modules" %% "scala-parser-combinators" % "1.0.5",
  "com.regblanc" %% "scala-smtlib" % "0.2.1"
)

crossVersion := CrossVersion.patch

assemblyShadeRules in assembly := Seq(
  ShadeRule.rename("smtlib.**" -> "local.whatever.shaded.smtlib.@1").inAll
)

assemblyExcludedJars in assembly := {
  // for some reason, scala-library is always included
  val cp = (fullClasspath in assembly).value
  cp.filter(_.data.getName == s"scala-library-${scalaVersion.value}.jar")
}

artifact in (Compile, assembly) := {
  val art = (artifact in (Compile, assembly)).value
  art.copy(`classifier` = Some("assembly"))
}

addArtifact(artifact in (Compile, assembly), assembly)