Question

I’m trying to separate various settings from the build definition in my Play! 2.1 application.

I defined some settings in build.sbt as follows:

name := "My Project"
version := 1.0

How can I reuse these values in Build.scala?

object ApplicationBuild extends Build {

  val main = 
    // Doesn't compile since name and version are SettingKeys, not Strings
    play.Project(name, version).settings(
      // ...
    )

}

Thanks a lot!

Answer 1

You can use <<= instead of := if you need to access keys (like <+= instead of +=). In this case we want to pull the version and name from the global scope.

val main = play.Project(appName, appVersion, appDependencies).settings(
  version <<= (version in Global)  { v => v} ,
  name <<= (name in Global) { n => n } 
)

Although since this is the default scope we can omit the scope in this case.

val main = play.Project(appName, appVersion, appDependencies).settings(
  version <<= (version)  { v => v} ,
  name <<= (name) { n => n } 
)

An even shorter version of this is simply

val main = play.Project(appName, appVersion, appDependencies).settings(
  version <<= version ,
  name <<= name
)

Note your build.sbt file must go in the root directorying and not the project/ directory.