get SBT settings from ModuleID - scala

Question

How can I use a moduleID: ModuleID for a "sibling" project to access settings keys?
I'm writing an SBT plugin for multi-module builds.
I have project A (which dependsOn B) and project B.
Both projects have my-own generate and mybuild tasks as settings keys.
The mybuild task consumes the value from generate - this works fine.
B doesn't depend upon anything, so B's mybuild only needs the key for B:generate and all is well.
I want A's mybuild to consume both A:generate and B:generate based on the fact that A dependsOn B in the build.sbt file.
The only promising key(s) I've found return the projects as : ModuleID instances, so is there some way to get a list of settings keys from a ModuleID?
... or should I be doing this another way?
Solution (Kind of)
Whth #himos help this ...
(myTaskKey in myConfig) := {
loadedBuild.value.allProjectRefs.find(_._1 == thisProjectRef.value).map(_._2) match {
case Some(myCurrentProject) =>
if (myCurrentProject.dependencies.nonEmpty)
sys.error {
myCurrentProject.dependencies
.map {
myDependsOnProject: ClasspathDep[ProjectRef] =>
(myDependsOnProject.project / myConfig / myTaskKey).value
// https://www.scala-sbt.org/0.13/docs/Tasks.html#Dynamic+Computations+with
}
.foldLeft("mine.dependencies:")(_ + "\n\t" + _)
}
}
}
... sort of works.
It causes an error that implies I've accessed the correct object, even if the SBT macros don't like it.

Answer 1

I think ModuleID that you mention relates to dependency management, not sub projects.
For taking sub project setting/task keys project scope can be used:
(generate in A).value
(generate in B).value
More comprehensive example:
name := "A"
version := "1.0"
scalaVersion := "2.12.5"
val generate = TaskKey[String]("generate")
val myBuild = TaskKey[String]("myBuild")
val a = (project in file(".")).settings(Seq(
generate := "A_generate"
))
val b = (project in file("proj_b")).settings(Seq(
generate := "B_generate",
myBuild := (generate in a).value + "_" + generate.value
)).dependsOn(a)
Sbt console output:
sbt:A> show b/myBuild
[info] A_generate_B_generate