Set task settings from build.sbt

Question

I am writing a small sbt plugin to generate some files which should be configurable by a target path parameter. Therefore I wrote this plugin code:

object GeneratorPlugin extends AutoPlugin {
  object autoImport {
    val targetPath = settingKey[String]["target directory"]
    val generateFiles = taskKey[Unit]["generate files"]
  }

  import autoImport._

  override def trigger = allRequirements

  override lazy val buildSettings = Seq(
    targetPath := ".",
    generateFiles := generateTask
  )

  lazy val generateTask = Def.task {
    System.out.println(targetPath.value)
  }
}

When importing this using addSbtPlugin in project/plugins.sbt and running it with sbt generateFiles is correctly printing . . However when I change the value of targetPath in my build.sbt the result does not change.

targetPath := "/my/new/path"

Result of sbt generateFiles is still . . Is there a way to change the value of targetPath within my build.sbt when importing the plugin?

Answer 1

You can change it like so:

targetPath in ThisBuild := "/my/new/path"

or in the sbt 1.1's new slash syntax

ThisBuild / targetPath := "/my/new/path"