How to create sbt plugin for current events of building app?

Question

I have this hello world plugin:

object HelloPlugin extends AutoPlugin {

  object autoImport {
    val sayHello: TaskKey[Unit] = TaskKey("saying hello")
  }

  import autoImport._
  override def projectSettings = Seq(

    sayHello := {
      println("------------------------------------ heeeeeeeeeeeeeeeelooooooooo -------------------")
    }
  )

}

I'd like using my sayHello task before and after compile time. How can I do it?

I found relative question, but it's not about AutoPlugin extending.

score 0 · Answer 1 · answered Aug 02 '18 at 23:20

0

You just need to adapt that answer to your situation. The answer stays the same: use dependsOn, but instead of build.sbt you add it to your plugin's projectSettings:

override def projectSettings = Seq(
  sayHello := { ... },
  Compile/compile := (Compile/compile).dependsOn(sayHello).value
)

answered Aug 02 '18 at 23:20

laughedelic

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Great! But I don't understand how I can import `Compile/compile`. `IntelliJ Idea` can't help me. :( Also, can I make something just after compile as well? – faoxis Aug 03 '18 at 05:00
What do you mean by "import `Compile/compile`"? If you're using sbt 0.13, write `compile in Compile` instead. To do something after a task read this: https://www.scala-sbt.org/release/docs/Howto-Sequential-Task.html – laughedelic Aug 04 '18 at 21:11

score 0 · Answer 2 · answered Aug 30 '18 at 18:51

You need to override compile TaskKey, like:

override def projectSettings: Seq[Def.Setting[_]] = Seq(
    compile in Compile := Def.taskDyn {
          hello.value // call before
          val c = (compile in Compile).value // actual compilation
          Def.task {
            hello.value // call after
            c
          }
        }.value
)

def hello: Def.Initialize[Task[Unit]] = Def.task {
   println("hello")
}

Docs: https://www.scala-sbt.org/1.0/docs/Howto-Dynamic-Task.html#build.sbt+v2

How to create sbt plugin for current events of building app?

2 Answers2