scala - Write concise sbt configurations based on combinations of predefined configuration parameters

Question

I'm attempting to remove as much unnecessary strings from my build.sbt as possible

sbt offers way to use Provide, Test, etc. as configuration parameters, like so:

"org.apache.spark" %% "spark-core" % "3.0.0" % Provided,

or

"org.mockito" %% "mockito-scala" % "1.16.3" % Test,

But how can one rewite more complex configurations, like:

"org.scalatest" %% "scalatest" % "3.2.3" % "test,it",

or

.dependsOn(util % "compile->compile;test->test")

Answer 1

sbt is (bastardized) Scala code, so you can always write some functions or extension methods like:

def configs(head: Configuration, tail: Configuration*) =
  (head :: tail.toList).mkString(",")


implicit final class DependsOnProject(project: Project) {

  private val testConfigurations = Set("test", "fun", "it")
  private def findCompileAndTestConfigs(p: Project) =
      (p.configurations.map(_.name).toSet intersect testConfigurations) + "compile"

  private val thisProjectsConfigs = findCompileAndTestConfigs(project)
  private def generateDepsForProject(p: Project) =
      p % (thisProjectsConfigs intersect findCompileAndTestConfigs(p) map (c => s"$c->$c") mkString ";")

  def compileAndTestDependsOn(projects: Project*): Project =
    project dependsOn (projects.map(generateDepsForProject): _*)
}

"org.scalatest" %% "scalatest" % "3.2.3" % configs(Test, It)

projectA.compileAndTestDependsOn(util)

It's just an example, you can write your own utilities that suits your needs. You can also just assign these Strings to vals and use named values instead.