Ethan Atkins a83c280db1 Improve StateTransform ... The StateTransform class introduced in 9cdeb7120e did not cleanly integrate with logic for transforming the state using the `transformState` task attribute. For one thing, the state transform was only applied if the root node returned StateTransform but no transformation would occur if a task had a dependency that returned StateTransform. Moreover, the transformation would override all other transformations that may have occurred during task evaluation. This commit updates StateTransform to act very similarly to the transformState attribute. Instead of wrapping a `State` instance, it now wraps a transformation function from `State => State`. This function can be applied on top of or prior to the other transformations via the `transformState`. For binary compatibility with 1.3.0, I had to add the stateProxy function as a constructor parameter in order to implement the `state` method. The proxy function will generally throw an exception unless the legacy api is used. To avoid that, I private[sbt]'d the legacy api so that binary compatibility is preserved but any builds targeting > 1.4.x will be required to use the new api. Unfortunately I couldn't private[sbt] StateTransform.apply(state: State) because mima interpreted it as a method type change becuase I added StateTransform.apply(transform: State => State). This may be a mima bug given that StateTransform.apply(state: State) would be jvm public even when private[sbt], but I figured it was quite unlikely that any users were using this method anyway since it was incorrectly implemented in 1.3.0 to return `state` instead of `new StateTransform(state)`.		2019-11-30 15:06:34 -08:00
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src	Improve StateTransform	2019-11-30 15:06:34 -08:00
NOTICE	Add, configure & enforce file headers	2017-10-05 09:03:40 +01:00