如何有条件地调用 sbt 中的任务? [英] How to conditionally invoke a task in sbt?

问题描述

说taskA是一个繁重的任务，只有在启用时才应该调用，taskAEnabled是相应的设置键.

Say taskA is a heavy task which should only be invoked if it's enabled and taskAEnabled is the corresponding setting key.

一种幼稚的方法是:

val taskAConditional = Def.task {
  (taskAEnabled, taskA) map { (taskAEnabled, taskA) => 
    if (taskAEnabled) taskA.value
  }
}

由于 sbt 设计，这将不起作用.由于 taskA 现在成为 taskAConditional 的依赖，它会被执行而不管 if 逻辑(即 taskAEnabled 将被忽略).

This won't work due to sbt design. As taskA now becomes the dependency of taskAConditional, it will be executed regardless of the if logic (i.e. taskAEnabled will be ignored).

有什么方法可以实现我想要的吗?(我无法更改 taskA，因为它是从其他地方导入的)

Is there a way that I can achieve what I want? (I can't change taskA as it's imported from somewhere else)

推荐答案

在 sbt 0.13.x 中，您可以使用动态计算 Def.taskDyn:

In sbt 0.13.x you can use dynamic computations Def.taskDyn:

val taskAConditional = Def.taskDyn {
  if (taskAEnabled.value) Def.task {
     taskA.value // this `.value` macro will extract result of taskA (execute it) only if taskAEnabled.value == true
  } 
}

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