Compile with different settings in different commands - command

Question

I have a project defined as follows:
lazy val tests = Project(
id = "tests",
base = file("tests")
) settings(
commands += testScalalib
) settings (
sharedSettings ++ useShowRawPluginSettings ++ usePluginSettings: _*
) settings (
libraryDependencies <+= (scalaVersion)("org.scala-lang" % "scala-reflect" % _),
libraryDependencies <+= (scalaVersion)("org.scala-lang" % "scala-compiler" % _),
libraryDependencies += "org.tukaani" % "xz" % "1.5",
scalacOptions ++= Seq()
)
I would like to have three different commands which will compile only some files inside this project. The testScalalib command added above for instance is supposed to compile only some specific files.
My best attempt so far is:
lazy val testScalalib: Command = Command.command("testScalalib") { state =>
val extracted = Project extract state
import extracted._
val newState = append(Seq(
(sources in Compile) <<= (sources in Compile).map(_ filter(f => !f.getAbsolutePath.contains("scalalibrary/") && f.name != "Typers.scala"))),
state)
runTask(compile in Compile, newState)
state
}
Unfortunately when I use the command, it still compiles the whole project, not just the specified files...
Do you have any idea how I should do that?

Answer 1

I think your best bet would be to create different configurations like compile and test, and have the appropriate settings values that would suit your needs. Read Scopes in the official sbt documentation and/or How to define another compilation scope in SBT?

Answer 2

I would not create additional commands, I would create an extra configuration, as #JacekLaskowski suggested, and based on the answer he had cited.
This is how you can do it (using Sbt 0.13.2) and Build.scala (you could of course do the same in build.sbt, and older Sbt version with different syntax)
import sbt._
import Keys._
object MyBuild extends Build {
lazy val Api = config("api")
val root = Project(id="root", base = file(".")).configs(Api).settings(custom: _*)
lazy val custom: Seq[Setting[_]] = inConfig(Api)(Defaults.configSettings ++ Seq(
unmanagedSourceDirectories := (unmanagedSourceDirectories in Compile).value,
classDirectory := (classDirectory in Compile).value,
dependencyClasspath := (dependencyClasspath in Compile).value,
unmanagedSources := {
unmanagedSources.value.filter(f => !f.getAbsolutePath.contains("scalalibrary/") && f.name != "Typers.scala")
}
))
}
now when you call compile everything will get compiled, but when you call api:compile only the classes matching the filter predicate.
Btw. You may want to also look into the possibility of defining different unmanagedSourceDirectories and/or defining includeFilter.