mvn2sbt - generates an sbt file based on a simple (java) pom.xml

mvn2sbt.scala

import scala.xml._
import java.io._

/**
 * based on https://gist.github.com/388334
 */
 
object mvn2sbt {

  private def printToFile(f: java.io.File)(op: java.io.PrintWriter => Unit) {
    val p = new java.io.PrintWriter(f)
    try { op(p) } finally { p.close() }
  }

  def main(args: Array[String]): Unit = {
    val prefix = args.headOption.getOrElse("")
    val pom = XML.loadString(scala.io.Source.fromFile(prefix + "pom.xml").mkString)
    val organization = pom \ "groupId" text
    val version = pom \ "version" text
    val name = pom \ "artifactId" text

    val data: Seq[(String, String, String, Option[String], Boolean)] = (pom \\ "dependency") map { d =>
      val groupId = d \ "groupId" text
      val artifactId = d \ "artifactId" text
      val versionNum = d \ "version" text
      val provided: Boolean = (d \ "optional").map(_.text.toBoolean).seq.headOption.getOrElse(false)
      val scope: Option[String] = (d \ "scope").map(_.text).seq.headOption
      (groupId, artifactId, versionNum, scope, provided)
    }

    def dep(a: String, g: String, v: String, scope: Option[String], isProvided: Boolean): String = {
      val sep = "%"
      val provided = if (isProvided) " % \"provided\"" else ""
      """libraryDependencies += "%s" %s "%s" %s "%s" %s %s""" format (g, sep, a, sep, v, scope.map(x => " % " + "\"" + x + "\"").getOrElse(""), provided)
    }

    val m = data map {
      case (g, a, v, scope, provided) => dep(a, g, v, scope, provided)
    } mkString ("\n\n")

    val buildFile =
      "organization := \"" + organization + "\"\n\n" +
        "name := \"" + name + "\"\n\n" +
        "version := \"" + version + "\"\n\n" +
        "javacOptions ++= Seq(\"-source\",\"1.7\",\"-target\",\"1.7\", \"-encoding\", \"UTF-8\")" + "\n\n" +
        """libraryDependencies += "com.novocode" % "junit-interface" % "0.10-M2" % "test" """ + "\n\n" +
        """parallelExecution in Test := false """ + "\n\n" +
        m 

    printToFile(new File(prefix + "build.sbt"))(p => {
      p.println(buildFile)
    })
    println("[Done] "+prefix+"build.sbt is created.")

  }
}