如何在SBT多项目中共享自定义任务

Question

我有一个项目设置为SBT多构建。看起来像这样：

- project
   Dependencies.scala
- core
   build.sbt
- server
   build.sbt
build.sbt

我想使用Dependencies.scala作为子项目之间共享的库版本号的容器。

sealed trait Dependencies {
  val commonsIo = "2.4"
}

object DependencyVersions extends Dependencies

在root build.sbt中，我添加了一个Setting给每个子项目。

lazy val dependencies = settingKey[Dependencies]("versions")

val defaultSettings = Defaults.coreDefaultSettings ++ Seq(
    dependencies := DependencyVersions)

def projectFolder(name: String, theSettings: Seq[Def.Setting[_]] = Nil) = Project(name, file(name), settings = theSettings)

lazy val core = projectFolder("core", defaultSettings)

我无法访问dependencies中的core/build.sbt设置。

"commons-io" % "commons-io" % dependencies.value.commonsIo, <-- doesn't work

我怎样才能让它发挥作用？

Answer 1

您可以在object Common extends AutoPlugin（project/Common.scala）中定义公共设置（依赖项），然后在子项目描述符上使用.enablePlugin(Common)（请参阅Anorm）

Answer 2

感谢@cchantep现在正在使用下面的AutoPlugin

import sbt._

sealed trait Dependencies {
  val commonsIo = "2.4"
}

object DependencyVersions extends Dependencies

object DependencyVersionsPlugin extends AutoPlugin {
  override def trigger = allRequirements

  object autoImport {
    lazy val dependencies = settingKey[Dependencies]("Bundles dependency versions")
  }

  import autoImport._

  override def projectSettings = Seq(
    dependencies := DependencyVersions
  )
}