SBT plugin - User defined configuration for Command via their build.sbt

Question

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 i

Answer 1

Take a look at the example here: http://www.scala-sbt.org/release/docs/Extending/Plugins.html#example-plugin

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) }
)

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

newSetting := "light"

EDIT

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)            
}

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

You can override this setting in build.sbt:

newSetting := "modified"

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

EDIT 2

Here's a stand-alone version of the example above: https://earldouglas.com/ext/stackoverflow.com/questions/17038663/