如何在sbt插件中生成源代码？

Question

我正在尝试生成一些源,如生成文件中所述.

当我把以下内容放入我的时候build.sbt,一切正常:

sourceGenerators in Compile += Def.task {
  val file = (sourceManaged in Compile).value / "demo" / "Test.scala"
  IO.write(file, """object Test extends App { println("Hi") }""")
  Seq(file)
}.taskValue

但是当我尝试在插件中执行相同的操作时,任务永远不会运行:

object MyPlugin extends AutoPlugin {
  override lazy val projectSettings = Seq(
    sourceGenerators in Compile += Def.task {
      val file = (sourceManaged in Compile).value / "demo" / "Test.scala"
      IO.write(file, """object Test extends App { println("Hi") }""")
      Seq(file)
    }.taskValue
  )
}

我放入插件的其他所有内容似乎都运行正常,但源文件永远不会生成.

我错过了重要的事吗？

Answer 1

你必须加载后您的插件JvmPlugin,其复位sourceGenerators中projectSettings(见sbt.Defaults.sourceConfigPaths).

您可以通过将其添加为插件的要求来实现,例如

override def requires = JvmPlugin

您的完整示例应如下所示:

import sbt._
import Keys._
import plugins._

object MyPlugin extends AutoPlugin {
  override def requires = JvmPlugin
  override lazy val projectSettings = Seq(
    sourceGenerators in Compile += Def.task {
      val file = (sourceManaged in Compile).value / "demo" / "Test.scala"
      IO.write(file, """object Test extends App { println("Hi") }""")
      Seq(file)
    }.taskValue
  )
}