SBT插件 - 用户通过其build.sbt为Command定义的配置

问题描述

我编写一个添加命令的SBT插件，并希望用户能够通过在其 build.sbt 中设置变量来配置此命令。

I'm writing an SBT Plugin that adds a Command and would like users to be able to configure this Command by setting variables in their build.sbt. What is the simplest way to achieve this?

这是一个简单的插件示例：

Here is an simplified example of what the Plugin looks like:

import sbt.Keys._
import sbt._

object MyPlugin extends Plugin {

  override lazy val settings = Seq(commands += Command.args("mycommand", "myarg")(myCommand))

  def myCommand = (state: State, args: Seq[String]) => {

    //Logic for command...

    state
  }
}

我希望有人能够将 build.sbt 文件添加到

I would like someone to be able to add the follow to their build.sbt file:

newSetting := "light"

如何从 myCommand 命令里面的 String p>

How do I make this available as a String variable from inside the myCommand Command above?

推荐答案

请看这里的例子：

在此示例中，定义了一个任务和设置：

In this example, a task and setting are defined:

val newTask = TaskKey[Unit]("new-task")
val newSetting = SettingKey[String]("new-setting")

val newSettings = Seq(
  newSetting := "test",
  newTask <<= newSetting map { str => println(str) }
)

然后，插件的用户可以在他们的 build.sbt 中为 newSetting

A user of your plugin could then provide their own value for the newSetting setting in their build.sbt:

newSetting := "light"

EDIT

这里是另一个例子，更接近你的目的：

Here's another example, closer to what you're going for:

Build.scala ：

import sbt._
import Keys._

object HelloBuild extends Build {

    val newSetting = SettingKey[String]("new-setting", "a new setting!")

    val myTask = TaskKey[State]("my-task")

    val mySettings = Seq(
      newSetting := "default",
      myTask <<= (state, newSetting) map { (state, newSetting) =>
        println("newSetting: " + newSetting)
        state
      }
    )

    lazy val root =
      Project(id = "hello",
              base = file("."),
              settings = Project.defaultSettings ++ mySettings)
}

使用此配置，您可以在sbt提示符处运行 my-task ，您将看到

With this configuration, you can run my-task at the sbt prompt, and you'll see newSetting: default printed to the console.

您可以在 build.sbt 中覆盖此设置：

You can override this setting in build.sbt:

newSetting := "modified"

现在，当您在sbt提示符处运行 my-task 时，您将看到 newSetting：modified 打印到控制台。

Now, when you run my-task at the sbt prompt, you'll see newSetting: modified printed to the console.

编辑2

- 上面示例的独立版本：

Here's a stand-alone version of the example above: https://github.com/JamesEarlDouglas/sbt-custom-task

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