scala.meta.internal.metac.Main.scala Maven / Gradle / Ivy

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Scalac 2.x launcher that generates SemanticDB on compile

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package scala.meta.internal.metac

import scala.meta.cli._
import scala.meta.internal.semanticdb.scalac._
import scala.meta.metac._

import java.io._
import java.net._
import java.nio.channels._
import java.nio.file._

import scala.tools.nsc.{Main => ScalacMain}

class Main(settings: Settings, reporter: Reporter) {
  def process(): Boolean = {
    val manifestDir = Files.createTempDirectory("semanticdb-scalac_")
    val resourceUrl = classOf[SemanticdbPlugin].getResource("/scalac-plugin.xml")
    val resourceChannel = Channels.newChannel(resourceUrl.openStream())
    val manifestStream = new FileOutputStream(manifestDir.resolve("scalac-plugin.xml").toFile)
    manifestStream.getChannel.transferFrom(resourceChannel, 0, Long.MaxValue)
    manifestStream.close()
    val pluginClasspath = classOf[SemanticdbPlugin].getClassLoader match {
      case null => manifestDir.toString
      case cl: URLClassLoader => cl.getURLs.map(_.getFile).mkString(File.pathSeparator)
      case cl => sys.error(s"unsupported classloader: $cl")
    }
    val enablePluginArgs = List("-Xplugin:" + pluginClasspath, "-Xplugin-require:semanticdb")
    val enableRangeposArgs = List("-Yrangepos")
    val stopAfterPluginArgs = List("-Ystop-after:semanticdb-typer")
    val args = settings.scalacArgs ++ enablePluginArgs ++ enableRangeposArgs ++ stopAfterPluginArgs
    scala.Console.withOut(reporter.out) {
      scala.Console.withErr(reporter.err)(ScalacMain.process(args.toArray))
    }
    !ScalacMain.reporter.hasErrors
  }
}