Port of "Hello StructureMap" in C# over to the Cake Pattern in Scala. From https://gist.github.com/joshuaflanagan/397213

HelloCakePattern.scala

object HelloCakePattern {
  Container.appEngine.run
    
  object Container
    extends AppEngineComponent
    with EnglishGreeterComponent
    with ConsoleOutputDisplayComponent {
      val appEngine = new AppEngine
      val greeter = new EnglishGreeter
      val outputDisplay = new ConsoleOutputDisplay
  }

  trait AppEngineComponent extends IAppEnginerComponent {
    this: IGreeterComponent with IOutputDisplayComponent =>
  
    class AppEngine extends IAppEngine {
      def run = outputDisplay.show(greeter.getGreeting)
    }
  }
 
  trait IAppEnginerComponent {
    val appEngine: IAppEngine
    trait IAppEngine {
      def run: Unit
    }
  }
  
  trait IGreeterComponent {
    val greeter: IGreeter
    trait IGreeter {
      def getGreeting: String
    }
  }
  
  trait EnglishGreeterComponent extends IGreeterComponent {
    class EnglishGreeter extends IGreeter {
      def getGreeting: String = "Hello"
    }
  }

  trait FrenchGreeterComponent extends IGreeterComponent {
    class FrnechGreeter extends IGreeter {
      def getGreeting: String = "Bonjour"
    }
  }
 
  trait IOutputDisplayComponent {
    val outputDisplay: IOutputDisplay
    trait IOutputDisplay {
      def show(message: String): Unit
    }
  }
  
  trait ConsoleOutputDisplayComponent extends IOutputDisplayComponent {
    class ConsoleOutputDisplay extends IOutputDisplay {
      def show(message: String): Unit = println(message)
    }
  }
}