How to get source directories of all project dependencies of an sbt project?

Question

I\'m trying to implement an sbt task which collects all the source directories of projects specified using dependsOn method of a project. I end up with this piece o

Answer 1

I've been struggling with a similar problem but finally found an answer.

So, what you may do is to define a dynamic task performing your complex computation, like

val buildMaping: Def.Initialize[Task[Seq[Def.Initialize[(ProjectRef, Seq[Seq[File]])]]]] = {
  Def.taskDyn {
    val refs = loadedBuild.value.allProjectRefs

    val tt = refs.map(_._1).map {
      ref =>
        sourceDirectories.all(ScopeFilter(inProjects(ref)))
          .zipWith(Def.setting(ref)) { case (a, b) => b -> a }
    }

    Def.task {
      tt
    }
  }
}

So, this buildMapping allows you to get a map of project references to their source directories.

then invoke your task this way:

Def.task {
    val sd = settingsData.in(Global).value
    val mapping = buildMaping.value.map(_.evaluate(sd)).toMap
    val allProjectRefs = loadedBuild.value.allProjectRefs.map(_._1)
    //... now you may iterate over each project, 
    // get deps and use the mapping to resolve your values
}