Getting an SBT task to depend on the OneJar task - scala

Question

I'm having trouble getting my new SBT task 'install' to depend on the OneJar task. Here's my Build.scala file:
import sbt._
import Keys._
import com.github.retronym.SbtOneJar._
object BuildBroBuild extends Build {
val install = TaskKey[Unit]("install", "Installs the JAR and a launcher script into your homedir")
private def installTask = task {
println("Hello world!")
}
override lazy val settings = super.settings ++
Seq(install <<= (oneJar in Global)(installTask dependsOn(_)))
lazy val root = Project(id = "buildbro",
base = file("."),
settings = Project.defaultSettings)
}
And here's the error I'm getting:
[error] Reference to undefined setting:
[error]
[error] */*:one-jar from {.}/*:install
[error] Did you mean *:one-jar ?
[error]
Does anybody know what this means? I believe I have to scope the oneJar TaskKey in a different way. Thanks for any help you can offer.

Answer 1

I think something like this should work:
object BuildBroBuild extends Build {
val install = TaskKey[Unit]("install", "Installs the JAR and a launcher script into your homedir")
private lazy val installTask = install <<= (oneJar, streams) map { case (a, s) => {
// 'a' is the output from the onejar task (ie, the artifact)
println("Hello world!")
}
override lazy val settings = super.settings ++
Seq(installTask)
lazy val root = Project(id = "buildbro",
base = file("."),
settings = Project.defaultSettings)
}
Here, we are taking the output of the oneJar task (as well as streams, which allows for logging, etc) as input for our new task.