Dynamically change SBT Package based on Input to SBT command - scala

Question

I have a project where I'm having several Object that contains the main function. I would like to package several JAR out of this project where each JAR contains only certain packages. For example., here is my src folder contents:
src
main
scala
com.myproject
package1
SomeClass1.scala
package2
SomeClass2.scala
package3
SomeClass3.scala
package4
SomeClass4.scala
Now what I want to do is to run several SBT commands where I can specify some command line arguments that would then exclude either package1 or package2 and so on.
I understand that I could so so with some filtering like below, but how do I combine the command line argument to check which package I should exclude?
// Filter when packaging
excludeFilter in (Compile, unmanagedSources) ~= { _ ||
((f: File) =>
f.getPath.containsSlice("/package1/"))
}
unmanagedSources / excludeFilter := "Main.scala"
So I would like to check the command line argument to build.sbt and use that to exclude the respective packages all-together. Any inputs on how I could do this?
Here is what I tried, but does not work as expected:
import complete.DefaultParsers._
val kfp = inputKey[Unit]("A demo input task.")
kfp := {
// get the result of parsing
val args: Seq[String] = spaceDelimited("<arg>").parsed
// Here, we also use the value of the `scalaVersion` setting
println("The current Scala version is " + scalaVersion.value)
println("The arguments to demo were:")
args foreach println
if (args(0) == "package1")
// Filter when packaging
excludeFilter in (Compile, unmanagedSources) ~= { _ ||
((f: File) =>
f.getPath.containsSlice("/package2/"))
}
else if (args(0) == "package2")
// Filter when packaging
excludeFilter in (Compile, unmanagedSources) ~= { _ ||
((f: File) =>
f.getPath.containsSlice("/package3/"))
}
else if (args(0) == "package3")
// Filter when packaging
excludeFilter in (Compile, unmanagedSources) ~= { _ ||
((f: File) =>
f.getPath.containsSlice("/package4/"))
}
else
// Filter when packaging
excludeFilter in (Compile, unmanagedSources) ~= { _ ||
((f: File) =>
f.getPath.containsSlice("/package1/"))
}
}
Call it like
sbt package "kfp package1"