How can you add custom artifacts in a SBT command - scala

Question

Can anyone show me how to add multiple Artifacts within a SBT Command? I want to do the following. Given the following tree:
- target
|- scala-2.10
|- classes
|- my
|- package
|- foo
- bar
- john
- doe
I want to create a command that publishes a individual Artifact (jar) for each folder under my/package. There should not be any default Artifact. Projects that depend on this library should use classifiers, i.e.
libraryDependencies += "whatever" % "whatever" % "1.0" Artifacts(Artifact("foo", "john") )
Here is what I have so far.
def myCommand = Command.single("myCommand") {
case (currentState, arg) =>
val extracted = Project.extract(currentState)
val compileDirectory = extracted.get[File](classDirectory in Compile)
val packageDir = new sbt.File(compileDirectory, s"my${File.separator}package")
val artifactDefinitions = IO.listFiles(packageDir).toList.map {
serviceDir =>
val serviceName = serviceDir.name.split(File.separatorChar).reverse.head
println(s"Adding artifact for $serviceName")
val serviceTask = taskKey[File](s"Adds a $serviceName artifact")
serviceTask := {
serviceDir
}
val definition = addArtifact(Artifact("service", serviceName), serviceTask)
extracted.append(definition.settings, currentState) <-- fails on this line
definition
}
currentState
}
Error I am getting:
Reference to undefined setting:
*:serviceTask from *:packagedArtifacts ((sbt.BuildExtra) Defaults.scala:1767)

Answer 1

def myCommand = Command.single("myCommand") {
case (currentState, arg) =>
val extracted = Project.extract(currentState)
val targetDirectory = extracted.get[File](target in Compile)
val compileDirectory = extracted.get[File](classDirectory in Compile)
val packageDir = new sbt.File(compileDirectory, s"my${java.io.File.separator}package")
val additionalArtifacts = IO.listFiles(packageDir).toList.map { serviceDir =>
val serviceName = serviceDir.name.split(java.io.File.separatorChar).reverse.head
println(s"Adding artifact for $serviceName")
val files = Path.allSubpaths(serviceDir)
val outputZip = new sbt.File(targetDirectory, s"$serviceName.jar")
sbt.IO.zip(files, outputZip)
(Artifact(serviceName, serviceName), outputZip)
}.toMap
val settings = Seq[Setting[_]](
packagedArtifacts ++= additionalArtifacts,
artifacts ++= additionalArtifacts.keys.toSeq
)
extracted.append(settings, s)
}