在任务中运行任务并评估其结果sbt

Question

我有兴趣编写一个任务，创建我的项目的启动程序，该程序完全不再涉及sbt。谢天谢地，我知道所有的信息，所以我可以创建自己的首发。在交互模式这四个命令告诉我，我需要创建我首发的所有信息，但他们只是把它们打印出来，我无法进一步处理他们

show java-options 
show unmanaged-jars 
show managed-classpath 

我想处理这三个结果任务进一步，但是我知道我不知道该怎么做。维基中的任务定义非常混乱，并且运算符甚至更多。

Answer 1

创建任务并不多。我假设你看了看wiki，并没有理解。我想你会做这样的事情例如：

val stringTask = TaskKey[String]("string-task") 
stringTask <<= (sampleTask, intTask) map { (sample: Int, intValue: Int) => 
    "Sample: " + sample + ", int: " + intValue 
} 

的<<=方法简单地说的stringTask的定义取决于其他任务。

另一方面，也许你需要一个亚军，而不是一个任务。

不幸的是，写一个跑步者并不那么简单。我在this project。下面是它的定义：

class MyRunner(subproject: String, config: ForkScalaRun) extends sbt.ScalaRun { 
    def run(mainClass: String, classpath: Seq[File], options: Seq[String], log: Logger): Option[String] = { 
    log.info("Running " + subproject + " " + mainClass + " " + options.mkString(" ")) 

    val javaOptions = classpathOption(classpath) ::: mainClass :: options.toList 
    val strategy = config.outputStrategy getOrElse LoggedOutput(log) 
    val process = Fork.java.fork(config.javaHome, 
            config.runJVMOptions ++ javaOptions, 
            config.workingDirectory, 
            Map.empty, 
            config.connectInput, 
            strategy) 
    def cancel() = { 
     log.warn("Run canceled.") 
     process.destroy() 
     1 
    } 
    val exitCode = try process.exitValue() catch { case e: InterruptedException => cancel() } 
    processExitCode(exitCode, "runner") 
    } 
    private def classpathOption(classpath: Seq[File]) = "-classpath" :: Path.makeString(classpath) :: Nil 
    private def processExitCode(exitCode: Int, label: String) = { 
    if(exitCode == 0) None 
    else Some("Nonzero exit code returned from " + label + ": " + exitCode) 
    } 
} 

它变得像这样使用：这么快

runner in Compile in run <<= (thisProject, taskTemporaryDirectory, scalaInstance, baseDirectory, javaOptions, outputStrategy, javaHome, connectInput) map { 
    (tp, tmp, si, base, options, strategy, javaHomeDir, connectIn) => 
    new MyRunner(tp.id, ForkOptions(scalaJars = si.jars, javaHome = javaHomeDir, connectInput = connectIn, outputStrategy = strategy, 
     runJVMOptions = options, workingDirectory = Some(base))) 
}