sbt - copy SOME libraryDependencies to output lib folder

Question

Using sbt, I'd like to copy some dependency jars to a lib output folder. If possible, I'd like to use the %provided% keyword, like I can with sbt-assembly.

So given a build.sbt somewhat similar to the following, how do create a task that copies the ark-tweet-nlp but NOt the spark-core dependencies to target/scala-%ver%/lib ?

retrieveManaged := true simply copies everything, which is not what I want.

...
libraryDependencies += "org.apache.spark" %% "spark-core" % "1.0.0" % "provided"

libraryDependencies += "edu.cmu.cs" % "ark-tweet-nlp" % "0.3.2"

retrieveManaged := true
...

Answer 1

You could write a task like this.

build.sbt

val retrieveNotProvided = taskKey[Unit]("Copies non provided and non internal dependencies")

def isInternalOrProvided(conf: String) = conf.contains("-internal") || conf == "provided"

retrieveNotProvided := {
  val toCopy = new collection.mutable.HashSet[(File, File)]
  val pattern = retrievePattern.value
  val output = managedDirectory.value
  update.value.retrieve { (conf, mid, art, cached) =>
    import org.apache.ivy.core.IvyPatternHelper
    val fileName = IvyPatternHelper.substitute(
      pattern, mid.organization, mid.name, mid.revision, art.name, art.`type`, art.extension, conf
    )
    if (!isInternalOrProvided(conf)) toCopy += (cached -> output / fileName)
    cached
  }
  IO.copy(toCopy)
}

You'll have to remove retrieveManaged := true from your build.sbt , because otherwise sbt will trigger the original retrieve function.