使SBT任务依赖于OneJar任务

Question

我很难让我的新SBT任务“安装”依赖于OneJar任务。这是我的Build.scala文件：

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)
}

下面是我得到的错误：

[error] Reference to undefined setting: 
[error] 
[error]   */*:one-jar from {.}/*:install
[error]      Did you mean *:one-jar ?
[error]  

有人知道这是什么意思吗？我认为我必须以一种不同的方式来确定oneJar TaskKey的范围。感谢你能提供的任何帮助。

Answer 1

我认为像这样的东西应该是有效的：

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)
}

在这里，我们将oneJar任务(以及允许日志记录的streams等)的输出作为新任务的输入。