scala.build.compiler.SimpleJavaCompiler.scala Maven / Gradle / Ivy

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package scala.build.compiler

import java.io.File

import scala.build.internal.Runner
import scala.build.{Logger, Project}
import scala.util.Properties

/** A simple Java compiler to handle pure Java projects.
  *
  * @param defaultJavaCommand
  *   the default `java` command to be used
  * @param defaultJavaOptions
  *   the default jvm options to be used with the `java` command
  */
final case class SimpleJavaCompiler(
  defaultJavaCommand: String,
  defaultJavaOptions: Seq[String]
) {

  def compile(
    project: Project,
    logger: Logger
  ): Boolean =
    project.sources.isEmpty || {
      val javacCommand =
        project.javaHomeOpt.map(javaHome => SimpleJavaCompiler.javaCommand(javaHome, "javac"))
          .getOrElse(defaultJavaCommand)

      // Java 8 doesn't automatically create a directory for the classes
      if (!os.exists(project.classesDir)) os.makeDir.all(project.classesDir)

      val args = project.javacOptions ++
        Seq(
          "-d",
          project.classesDir.toString,
          "-cp",
          project.classPath.map(_.toString).mkString(File.pathSeparator)
        ) ++
        project.sources.map(_.toString)

      val proc = Runner.run(
        Seq(javacCommand) ++ args,
        logger,
        cwd = Some(project.workspace)
      )

      val res = proc.waitFor()

      res == 0
    }
}

object SimpleJavaCompiler {

  def javaCommand(javaHome: os.Path, command: String = "java"): String = {
    val ext  = if (Properties.isWin) ".exe" else ""
    val path = javaHome / "bin" / s"$command$ext"
    path.toString
  }
}