Adding new task dependencies to built-in SBT tasks?

Question

Is it possible to override or modify built-in SBT tasks (like compile) to depend on custom tasks in my own Build.scala? Overriding e.g. \"compile\" directly is not possible sinc

Answer 1

Update: See arussell84's answer for a modern way to do this

You should be able to do it like this:

in a .sbt file:

compile <<= (compile in Compile) dependsOn jruby

Where jruby is a task key that you've defined in a project/something.scala file:

val jruby = TaskKey[Unit]("jruby", "run a jruby file")

Also, this isn't part of your question but you can just call regular Scala code:

compile <<= (compile in Compile) map { result =>
  println("in compile, something")
  result
}