SBT task for slick code generation from a live database

Slick 3.0.0 code generation

//
// SBT task for slick code generation for a live database
// ======================================================
// 
// This sbt task will generate slick scala classes to match your (MySQL) database schema,
// which will allow you to use the database through slick, in your scala application. 
//
// Usage:  Review all ? symbols and comments below, to adapt to your system. Embed in build.sbt. 
//         Make sure the database is up. Run: sbt slickGenerate
//         In your scala application, import the resulting scala file
//
// Tested on Ubuntu, sbt 0.13.6, 3.0.0-RC2. Ugly code style like all build.sbt.
// 

libraryDependencies += "com.typesafe.slick" %% "slick-codegen" % "3.0.0-RC3"

lazy val slickGenerate = taskKey[Seq[File]]("slick code generation from an existing database")

slickGenerate := {
  import java.io.File
  val dbName = ???
  val userName = ???
  val password = ???
  val url = s"jdbc:mysql://localhost:3306/$dbName" // adapt as necessary to your system
  val jdbcDriver = "com.mysql.jdbc.Driver"         // replace if not MySQL
  val slickDriver = "slick.driver.MySQLDriver"     // replace if not MySQL
  val resultRelativeDir = ??? // directory to create output scala slick definitions at
  val targetPackageName = ??? // package name to give it
  val resultFilePath = s"$resultRelativeDir/$targetPackageName/Tables.scala"              // override the name if you like
  val backupFilePath = s"$resultRelativeDir/$targetPackageName/Tables.scala.auto-backup"  // override the name if you like
  val format = scala.Console.BLUE + scala.Console.BOLD
  println(format + s"Backing up existing slick mappings source to: file://${baseDirectory.value}/$backupFilePath")
  println(format + s"About to auto-generate slick mappings source from database schema at $url...")
  sbt.IO.copyFile(new File(resultFilePath), new File(backupFilePath))
  (runner in Compile).value.run("slick.codegen.SourceCodeGenerator", (dependencyClasspath in Compile).value.files, Array(slickDriver, jdbcDriver, url, resultRelativeDir, targetPackageName, userName, password), streams.value.log)
  println(format + s"Result: file://${baseDirectory.value}/$resultFilePath" + scala.Console.RESET)
  val diff = (s"diff -u $resultFilePath $backupFilePath" #| "colordiff").!!
  println(scala.Console.BLUE + s"Changes compared to previous output file, follow, if any.\n\n $diff") 
  Seq(file(resultFilePath))
}

I guess ??? is a little more idiomatic. :)

Thanks :)