How to set-up the sbt-proguard plugin in Build.scala - scala

Question

I want to use the sbt-proguard plugin in my project, but I need to set it up in a Build.scala file.
I read the documentation but there is just an example for the build.sbt file, which won't work in my case. I need to know how to configure the plugin for my Build.scala file.
Here's the link to the repo: https://github.com/sbt/sbt-proguard/blob/master/README.md#example
FYI: I'm using scala.version=2.11.4 and sbt.version=0.13.5

Answer 1

(Note: sbt currently recommends multi-project build.sbt instead of build.scala.)
Some of the sbt plugins use scripted to test itself, which sets up fake builds under src/sbt-test. If you find one it could contain nice samples on how to set up the plugin.
sbt-proguard created a sample called akka supposedly used by Akka project.
import sbt._
import sbt.Keys._
import com.typesafe.sbt.SbtProguard._
object SampleBuild extends Build {
import ProguardKeys.{ mergeStrategies, merge, options }
import ProguardOptions.keepMain
import ProguardMerge.append
lazy val proguardAkka = Project(
id = "proguard-akka",
base = file("."),
settings = Defaults.defaultSettings ++ proguardSettings ++ Seq(
scalaVersion := "2.10.1",
libraryDependencies += "com.typesafe.akka" %% "akka-remote" % "2.1.2",
merge in Proguard := true,
mergeStrategies in Proguard += append("reference.conf"),
options in Proguard += keepMain("A"),
options in Proguard += keepMain("B"),
options in Proguard += "-dontoptimize", // reduce time for proguard
options in Proguard += ProguardConf.akka
)
)
}
object ProguardConf {
val akka = ....
}