.ensime generating task for sbt

ensime-sbt.scala

  // generate ensime config
  lazy val genEnsime = task (args => {
    if (args.length == 1) {
      genEnsimeConstructor(args(0).toString)
    } else {
      task { Some("Usage: gen-ensime <project package name>") }
    }
  }) describedAs("Generate a .ensime file for this project")

  def genEnsimeConstructor(packageName: String) = task {
    val ensime = new StringBuffer()
    // if you have more libs, override this bit
    val jarDirs = List(dependencyPath, crossPath("lib_managed") + "/compile", crossPath("lib_managed") + "/test").map("\"" + _ + "\"")
    // ditto with more src dirs
    val srcDirs = List(thriftJavaPath.toString).map("\"" + _ + "\"")

    ensime.append(";; this config was generated by standard-project.  Feel free to customize!\n")
    ensime.append("(\n")
    ensime.append(":project-package \"").append(packageName).append("\"\n")
    ensime.append(":use-sbt t\n")
    ensime.append(":compile-jars (").append(jarDirs.mkString(" ")).append(")\n")
    ensime.append(":sources (").append(srcDirs.mkString(" ")).append(")\n")
    ensime.append(")\n")

    // rename old file (if it exists)
    val oldFile = new File(".ensime")
    if (oldFile.exists) {
      val newFile = new File(".ensime-%d".format(System.currentTimeMillis()))
      oldFile.renameTo(newFile)
    }
    // and dump our config
    val newFile = new File(".ensime")
    val writer = new FileWriter(newFile)
    writer.write(ensime.toString())
    writer.close()
    None
  }