如何在自定义 sbt 命令中暂时跳过运行编译任务？答案

【问题标题】：How do I temporarily skip running the compile task in an custom sbt command?如何在自定义 sbt 命令中暂时跳过运行编译任务？
【发布时间】：2012-04-29 22:14:53
【问题描述】：

从quick-install 命令（在我正在编写的 sbt 插件中定义）中运行package 任务时，我试图暂时跳过编译任务。我可以通过将skip 设置放在compile 任务上来跳过所有编译，但这会导致所有compile 任务被跳过：

  object MyPlugin extends Plugin {
    override lazy val settings = Seq(
      (skip in compile) := true
    )
    ...
  }

我只需要在运行quick-install 命令时跳过compile。有没有办法临时修改设置，或者将其范围仅限于我的快速安装命令？

我尝试了一个设置转换（基于https://github.com/harrah/xsbt/wiki/Advanced-Command-Example），它应该将skip := false 的所有实例替换为skip := true，但它没有任何效果（即转换后仍会发生编译）：

object SbtQuickInstallPlugin extends Plugin {
  private lazy val installCommand =  Command.args("quick-install", "quick install that skips compile step")(doCommand(Configurations.Compile))

  override lazy val settings = Seq(
    commands ++= Seq(installCommand),
    (Keys.skip in compile) := false    // by default, don't skip compiles
  )

  def doCommand(configs: Configuration*)(state: State, args: Seq[String]): State = {
    val extracted = Project.extract(state)
    import extracted._
    val oldStructure = structure

    val transformedSettings = session.mergeSettings.map(
      s => s.key.key match {
        case skip.key => { skip in s.key.scope := true } // skip compiles
        case _ => s
      }
    )

    // apply transformed settings (in theory)
    val newStructure = Load.reapply(transformedSettings, oldStructure)
    Project.setProject(session, newStructure, state)

    ...
}

知道我缺少什么和/或更好的方法吗？

编辑：

跳过设置是一个任务，所以一个简单的解决方法是：

object SbtQuickInstallPlugin extends Plugin {
  private lazy val installCommand =  Command.args("quick-install", "quick install that skips compile step")(doCommand(Configurations.Compile))

  private var shouldSkipCompile = false  // by default, don't skip compiles

  override lazy val settings = Seq(
    commands ++= Seq(installCommand),
    (Keys.skip in compile) := shouldSkipCompile
  )

  def doCommand(configs: Configuration*)(state: State, args: Seq[String]): State = {
    shouldSkipCompile = true // start skipping compiles

    ... // do stuff that would normally trigger a compile such as running the packageBin task

    shouldSkipCompile = false // stop skipping compiles
  }
}

我不相信这是最强大的解决方案，但它似乎可以满足我的需要。

【问题讨论】：

标签： sbt

【解决方案1】：

object SbtQuickInstallPlugin extends Plugin {
  private lazy val installCommand =  Command.args("quick-install", "quick install that skips compile step")(doCommand(Configurations.Compile))

  private var shouldSkipCompile = false  // by default, don't skip compiles

  override lazy val settings = Seq(
    commands ++= Seq(installCommand),
    (Keys.skip in compile) := shouldSkipCompile
  )

  def doCommand(configs: Configuration*)(state: State, args: Seq[String]): State = {
    shouldSkipCompile = true // start skipping compiles

    ... // do stuff that would normally trigger a compile such as running the packageBin task

    shouldSkipCompile = false // stop skipping compiles
  }
}

没关系，当然可以！

【讨论】：