Sbt 如何找到产生特定输出的任务？

运行

rpm:packageBin

时，一些错误消息会打印到sbt日志中

---

有没有办法找出哪个子任务产生错误日志？例如，我可以获得执行任务的某种跟踪吗？也许有一种方法可以串行运行所有任务，而不是并行运行，并显示每个任务何时启动/停止？

我不知道sbt是否提供了串行执行任务的模式。我怀疑这一点，毕竟这是sbt并行启动任务的主要特点

您可以使用

debug

查看封面下的内容

> help debug
debug

        Sets the global logging level to debug.
        This will be used as the default level for logging from commands, settings, and tasks.
        Any explicit `logLevel` configuration in a project overrides this setting.

--debug

        Sets the global logging level as described above, but does so before any other commands are executed on startup, including project loading.
        This is useful as a startup option:
                * it takes effect before any logging occurs
                * if no other commands are passed, interactive mode is still entered

对于任何失败的任务，还提供了

last

命令

> help last
last
        Prints the logging for the previous command, typically at a more verbose level.

last <key>
        Prints the logging associated with the provided key.  The key typically refers to a task (for example, test:compile).  The logging that is displayed is restricted to the logging for that particular task.

        See also 'last-grep'.

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我认为sbt不支持这种开箱即用的功能。但是，出于调试目的，您可以创建一个记录器并将其添加到

build.sbt

文件中的

extraLoggers

extraLoggers := {
  (key: ScopedKey[_]) => {
    val bl = new BasicLogger() {
       def control(event: ControlEvent.Value, message: => String) { log(Level.Info, message) }
       def logAll(events: Seq[LogEvent]) = events.foreach(log)
       def log(level: Level.Value, message: => String) = println("[ " + Scope.display(key.scope, "") + "] " + message)
       def success(message: => String): Unit = ()
       def trace(t: => Throwable): Unit = ()
    }
    Seq(bl)
  }
}

当添加时，它应该在每条消息之前打印范围，这是我相信你想要的。你当然可以进一步改进

extraLoggers := {
  (key: ScopedKey[_]) => {
    val bl = new BasicLogger() {
       def control(event: ControlEvent.Value, message: => String) { log(Level.Info, message) }
       def logAll(events: Seq[LogEvent]) = events.foreach(log)
       def log(level: Level.Value, message: => String) = println("[ " + Scope.display(key.scope, "") + "] " + message)
       def success(message: => String): Unit = ()
       def trace(t: => Throwable): Unit = ()
    }
    Seq(bl)
  }
}