zip task

build.sbt

lazy val zip = taskKey[Unit]("zip files") //define the key

 zip := {  // assigning a value to the zip key of type Unit
  val logger: Logger = sLog.value //get logger from SBT
//where to zip from
  val dirFromZip: File = srcFile.value  
  //where to zip to
  val dirToZip: File = baseDirectory.value / "build.sbt.zip"

  logger.info(s"zipping files from ${dirFromZip.absolutePath}")

   // actual zip function
   val fos = new FileOutputStream(toZip)
   val fis = new FileInputStream(dirFromZip)
   val zipOutputStream = new ZipOutputStream(fos)
   val zipEntry = new ZipEntry(fromZip.getName)
   zipOutputStream.putNextEntry(zipEntry)
   @scala.annotation.tailrec
   def readAgain(c : Int) : Int = {
     if(c < 0){
       -1
     }else{
       zipOutputStream.write(c)
       readAgain(fis.read())
     }
   }
   readAgain(fis.read())

   zipOutputStream.close()
   fis.close()
   fos.close()
  //end of zip function 
  
  logger.info(s"zipped files to ${dirToZip.absolutePath}")
 }