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or combinator for common optional setting handling case

This commit is contained in:
Mark Harrah 2011-05-23 08:14:10 -04:00
parent c5a312cedc
commit 6ae6a4b9ad
1 changed files with 2 additions and 0 deletions
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2
main/Structure.scala
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@ -158,6 +158,7 @@ object Scoped
final def apply[T](f: S => T): Initialize[T] = Apply.single(scoped)(f)
final def identity: Initialize[S] = apply(idFun)
final def ? : Initialize[Option[S]] = Project.optional(scoped)(idFun)
final def or[T >: S](i: Initialize[T]): Initialize[T] = (this.? zipWith i)(_ getOrElse _ )
final def ??[T >: S](or: => T): Initialize[T] = Project.optional(scoped)(_ getOrElse or )
final def get(settings: Settings[Scope]): Option[S] = settings.get(scope, key)
@ -197,6 +198,7 @@ object Scoped
def identity: App[S] = mk(idFun)
def ? : Initialize[Task[Option[S]]] = Project.optional(scoped) { case None => mktask { None }; case Some(t) => t map some.fn }
def ??[T >: S](or: => T): Initialize[Task[T]] = Project.optional(scoped)( _ getOrElse mktask(or) )
def or[T >: S](i: Initialize[Task[T]]): Initialize[Task[T]] = (this.? zipWith i)( (x,y) => (x :^: y :^: KNil) map hf2( _ getOrElse _ ))
def || [T >: S](alt: Task[T]): App[T] = mk(_ || alt)
def && [T](alt: Task[T]): App[T] = mk(_ && alt)