SBT 编译后应用任务 [英] SBT apply Task after Compile

问题描述

我可以在编译前自动执行任务:

I am able to automatically execute a task before compilation with:

compile in Compile <<= (compile in Compile).dependsOn(myTask)

在编译之后我该怎么做?

我知道我能做到:

compile in Compile <<= (compile in Compile) map{x=>
  // post-compile work
  doFoo()
  x
}

执行任意Scala代码，但我需要在编译事件发生时自动执行目标任务本身

to execute arbitrary Scala code, but I need to automatically execute the target task itself when a compile event occurs

做类似的事情:

val foo = TaskKey[Unit]("foo", "...")
val fooTask = foo <<= scalaInstance map {si =>
...
} dependsOn(compile in Compile)

如果我在 sbt> 提示符下输入foo"就可以工作；即编译后执行任务，但目标是挂钩到编译任务本身，所以每当编译发生时，编译完成后会自动调用 foo 任务.

works if I type "foo" from sbt> prompt; i.e. task is executed after compile, but the goal is to hook into compile task itself, so anytime a compilation occurs, the foo task is automatically called after compilation completes.

这可能吗，还是我以错误的方式处理内置编译任务?

Is this possible, or am I going about things in the wrong way to hook into the built-in compile task?

推荐答案

一般来说，有一些任务取决于你的任务.

In general, there is some task that depends on your task.

如果 compile 被用来表示为 Grunt 编译和设置"，那么创建一个依赖于 compile 的 prepareGrunt 任务和 myTask 并运行它.

If compile is being used to mean "compile and set things up for Grunt", then create a prepareGrunt task that depends on compile and myTask and run that instead.

如果 myTask 应该在项目的类和资源被其他东西使用之前运行，则使其成为 exportedProducts 的依赖项.run 和 test 等任务以及依赖项目中的任务将从该任务中获取导出的类路径条目.

If myTask should run before the project's classes and resources are used by something else, then make it a dependency of exportedProducts. Tasks like run and test and tasks in dependent projects will get the exported classpath entries from that task.

在编译后运行"的危险在于 myTask 不会在实际需要它的任务之前运行.Initialize[Task[T]] 上有 triggeredBy 方法，但是很容易被滥用，应该只在已知任务的输出只能使用时使用在所有任务执行之后.

The danger in "run sometime after compile" is that myTask won't be run before the task that actually needs it. There is the triggeredBy method on Initialize[Task[T]], but it is easily abused and should only be used when the output of the task is known to be used only after all tasks execute.

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