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require dynamic initialization to be explicitly enabled for derived settings

This commit is contained in:
Mark Harrah 2013-05-08 12:56:58 -04:00
parent 962a163f33
commit 68ca419a7c
1 changed files with 7 additions and 4 deletions
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11
util/collection/src/main/scala/sbt/Settings.scala
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@ -73,12 +73,15 @@ trait Init[Scope]
def uniform[S,T](inputs: Seq[Initialize[S]])(f: Seq[S] => T): Initialize[T] = def uniform[S,T](inputs: Seq[Initialize[S]])(f: Seq[S] => T): Initialize[T] =
new Apply[({ type l[L[x]] = List[L[S]] })#l, T](f, inputs.toList, AList.seq[S]) new Apply[({ type l[L[x]] = List[L[S]] })#l, T](f, inputs.toList, AList.seq[S])
def derive[T](s: Setting[T]): Setting[T] = { /** Constructs a derived setting that will be automatically defined in every scope where one of its dependencies is explicitly defined.
deriveAllowed(s) foreach error * A setting initialized with dynamic dependencies is only allowed if `allowDynamic` is true.
* Only the static dependencies are tracked, however. */
final def derive[T](s: Setting[T], allowDynamic: Boolean = false): Setting[T] = {
deriveAllowed(s, allowDynamic) foreach error
new DerivedSetting[T](s.key, s.init, s.pos) new DerivedSetting[T](s.key, s.init, s.pos)
} }
def deriveAllowed[T](s: Setting[T]): Option[String] = s.init match { def deriveAllowed[T](s: Setting[T], allowDynamic: Boolean): Option[String] = s.init match {
case _: Bind[_,_] => Some("Cannot derive from dynamic dependencies.") case _: Bind[_,_] if !allowDynamic => Some("Cannot derive from dynamic dependencies.")
case _ => None case _ => None
} }