Port Settings

util-collection/src/main/scala/sbt/internal/util/AList.scala

@@ -58,6 +58,36 @@ object AList:
   // givens for tuple map
   given [Tup <: Tuple]: AList[[F[_]] =>> Tuple.Map[Tup, F]] = tuple[Tup]
 
+  type Empty = AList[[F[_]] =>> Unit]
+
+  lazy val empty: Empty = new Empty:
+    override def transform[F1[_], F2[_]](value: Unit)(f: [x] => F1[x] => F2[x]): Unit = ()
+    override def traverse[F1[_], F2[_]: Applicative](value: Unit)(
+        f: [a] => F1[a] => F2[a]
+    ): F2[Unit] = summon[Applicative[F2]].pure(())
+    override def traverseX[F1[_], F2[_]: Applicative, P[_]](value: Unit)(
+        f: [a] => F1[a] => F2[P[a]]
+    ): F2[Unit] = summon[Applicative[F2]].pure(())
+    override def foldr[F1[_], A2](value: Unit, init: A2)(
+        f: [a] => (F1[a], A2) => A2
+    ): A2 = init
+
+  def single[A1]: AList[[F[_]] =>> F[A1]] =
+    new AList[[F[_]] =>> F[A1]]:
+      override def transform[F1[_], F2[_]](value: F1[A1])(f: [x] => F1[x] => F2[x]): F2[A1] =
+        f(value)
+      override def traverse[F1[_], F2[_]: Applicative](value: F1[A1])(
+          f: [a] => F1[a] => F2[a]
+      ): F2[A1] = f(value)
+      override def traverseX[F1[_], F2[_]: Applicative, P[_]](value: F1[A1])(
+          f: [a] => F1[a] => F2[P[a]]
+      ): F2[P[A1]] = f(value)
+      override def foldr[F1[_], A2](value: F1[A1], init: A2)(
+          f: [a] => (F1[a], A2) => A2
+      ): A2 = f(value, init)
+
+  def tuple2[A1, A2]: AList[[F[_]] =>> Tuple.Map[(A1, A2), F]] = tuple[(A1, A2)]
+
   def tuple[Tup <: Tuple]: AList[[F[_]] =>> Tuple.Map[Tup, F]] =
     new AList[[F[_]] =>> Tuple.Map[Tup, F]]:
       override def transform[F1[_], F2[_]](value: Tuple.Map[Tup, F1])(

util-collection/src/main/scala/sbt/internal/util/INode.scala

@@ -10,51 +10,56 @@ package sbt.internal.util
 import java.lang.Runnable
 import java.util.concurrent.{ atomic, Executor, LinkedBlockingQueue }
 import atomic.{ AtomicBoolean, AtomicInteger }
-import Types.{ ConstK, Id }
+import Types.Id
 
-object EvaluationState extends Enumeration {
-  val New, Blocked, Ready, Calling, Evaluated = Value
-}
+enum EvaluationState:
+  case New
+  case Blocked
+  case Ready
+  case Calling
+  case Evaluated
 
-/*
-abstract class EvaluateSettings[ScopeType] {
+abstract class EvaluateSettings[ScopeType]:
   protected val init: Init[ScopeType]
   import init._
 
   protected def executor: Executor
   protected def compiledSettings: Seq[Compiled[_]]
 
-  import EvaluationState.{ Value => EvaluationState, _ }
+  import EvaluationState.*
 
   private[this] val complete = new LinkedBlockingQueue[Option[Throwable]]
   private[this] val static = PMap.empty[ScopedKey, INode]
   private[this] val allScopes: Set[ScopeType] = compiledSettings.map(_.key.scope).toSet
 
-  private[this] def getStatic[T](key: ScopedKey[T]): INode[T] =
-    static get key getOrElse sys.error("Illegal reference to key " + key)
+  private[this] def getStatic[A](key: ScopedKey[A]): INode[A] =
+    static.get(key).getOrElse { sys.error("Illegal reference to key " + key) }
 
-  private[this] val transform: Initialize ~> INode = λ[Initialize ~> INode] {
-    case k: Keyed[s, A1$] @unchecked => single(getStatic(k.scopedKey), k.transform)
-    case a: Apply[k, A1$] @unchecked =>
-      new MixedNode[k, A1$](
-        a.alist.transform[Initialize, INode](a.inputs, transform),
-        a.f,
-        a.alist
-      )
-    case b: Bind[s, A1$] @unchecked           => new BindNode[s, A1$](transform(b.in), x => transform(b.f(x)))
-    case v: Value[A1$] @unchecked             => constant(v.value)
-    case v: ValidationCapture[A1$] @unchecked => strictConstant(v.key: A1$)
-    case t: TransformCapture                  => strictConstant(t.f: A1$)
-    case o: Optional[s, A1$] @unchecked =>
-      o.a match {
-        case None    => constant(() => o.f(None))
-        case Some(i) => single[s, A1$](transform(i), x => o.f(Some(x)))
-      }
-    case x if x == StaticScopes =>
-      strictConstant(allScopes.asInstanceOf[A1$]) // can't convince scalac that StaticScopes => T == Set[Scope]
-  }
+  private[this] val transform: [A] => Initialize[A] => INode[A] = [A] =>
+    (fa: Initialize[A]) =>
+      fa match
+        case k: Keyed[s, A] @unchecked => single(getStatic(k.scopedKey), k.transform)
+        case a: Apply[k, A] @unchecked =>
+          MixedNode[k, A](
+            a.alist.transform[Initialize, INode](a.inputs) { transform },
+            a.f,
+            a.alist
+          )
+        case b: Bind[s, A] @unchecked =>
+          new BindNode[s, A](transform(b.in), x => transform(b.f(x)))
+        case v: Value[A] @unchecked             => constant(v.value)
+        case v: ValidationCapture[A] @unchecked => strictConstant(v.key: A)
+        case t: TransformCapture                => strictConstant(t.f: A)
+        case o: Optional[s, A] @unchecked =>
+          o.a match
+            case None    => constant(() => o.f(None))
+            case Some(i) => single[s, A](transform(i), x => o.f(Some(x)))
+        case x if x == StaticScopes =>
+          // can't convince scalac that StaticScopes => T == Set[Scope]
+          strictConstant(allScopes.asInstanceOf[A])
+  //  allScopes.asInstanceOf[A]
 
-  private[this] lazy val roots: Seq[INode[_]] = compiledSettings flatMap { cs =>
+  private[this] lazy val roots: Seq[INode[_]] = compiledSettings.flatMap { cs =>
     (cs.settings map { s =>
       val t = transform(s.init)
       static(s.key) = t
@@ -78,54 +83,52 @@ abstract class EvaluateSettings[ScopeType] {
   }
 
   private[this] def getResults(implicit delegates: ScopeType => Seq[ScopeType]) =
-    static.toTypedSeq.foldLeft(empty) {
-      case (ss, static.TPair(key, node)) =>
-        if (key.key.isLocal) ss else ss.set(key.scope, key.key, node.get)
+    static.toTypedSeq.foldLeft(empty) { case (ss, static.TPair(key, node)) =>
+      if key.key.isLocal then ss
+      else ss.set(key.scope, key.key, node.get)
     }
 
-  private[this] val getValue = λ[INode ~> Id](_.get)
+  private[this] lazy val getValue: [A] => INode[A] => Id[A] = [A] => (fa: INode[A]) => fa.get
 
   private[this] def submitEvaluate(node: INode[_]) = submit(node.evaluate())
 
-  private[this] def submitCallComplete[T](node: BindNode[_, T], value: T) =
+  private[this] def submitCallComplete[A](node: BindNode[_, A], value: A) =
     submit(node.callComplete(value))
 
-  private[this] def submit(work: => Unit): Unit = {
+  private[this] def submit(work: => Unit): Unit =
     startWork()
-    executor.execute(new Runnable { def run = if (!cancel.get()) run0(work) })
-  }
+    // new Runnable { def run = if (!cancel.get()) run0(work) }
+    executor.execute(() => if !cancel.get() then run0(work) else ())
 
-  private[this] def run0(work: => Unit): Unit = {
+  private[this] def run0(work: => Unit): Unit =
     try {
       work
     } catch { case e: Throwable => complete.put(Some(e)) }
     workComplete()
-  }
 
   private[this] def startWork(): Unit = { running.incrementAndGet(); () }
 
   private[this] def workComplete(): Unit =
-    if (running.decrementAndGet() == 0)
-      complete.put(None)
+    if running.decrementAndGet() == 0 then complete.put(None)
+    else ()
 
-  private[this] sealed abstract class INode[T] {
+  private[this] sealed abstract class INode[A1]:
     private[this] var state: EvaluationState = New
-    private[this] var value: T = _
+    private[this] var value: A1 = _
     private[this] val blocking = new collection.mutable.ListBuffer[INode[_]]
     private[this] var blockedOn: Int = 0
-    private[this] val calledBy = new collection.mutable.ListBuffer[BindNode[_, T]]
+    private[this] val calledBy = new collection.mutable.ListBuffer[BindNode[_, A1]]
 
-    override def toString =
+    override def toString(): String =
       getClass.getName + " (state=" + state + ",blockedOn=" + blockedOn + ",calledBy=" + calledBy.size + ",blocking=" + blocking.size + "): " +
         keyString
 
     private[this] def keyString =
-      (static.toSeq.flatMap {
-        case (key, value) =>
-          if (value eq this) init.showFullKey.show(key) :: Nil else List.empty[String]
+      (static.toSeq.flatMap { case (key, value) =>
+        if (value eq this) init.showFullKey.show(key) :: Nil else List.empty[String]
       }).headOption getOrElse "non-static"
 
-    final def get: T = synchronized {
+    final def get: A1 = synchronized {
       assert(value != null, toString + " not evaluated")
       value
     }
@@ -149,10 +152,8 @@ abstract class EvaluateSettings[ScopeType] {
       assert(state == New, "Already registered and: " + toString)
       val deps = dependsOn
       blockedOn = deps.size - deps.count(_.doneOrBlock(this))
-      if (blockedOn == 0)
-        schedule()
-      else
-        state = Blocked
+      if blockedOn == 0 then schedule()
+      else state = Blocked
     }
 
     final def schedule(): Unit = synchronized {
@@ -170,13 +171,13 @@ abstract class EvaluateSettings[ScopeType] {
 
     final def evaluate(): Unit = synchronized { evaluate0() }
 
-    protected final def makeCall(source: BindNode[_, T], target: INode[T]): Unit = {
+    protected final def makeCall(source: BindNode[_, A1], target: INode[A1]): Unit = {
       assert(state == Ready, "Invalid state for call to makeCall: " + toString)
       state = Calling
       target.call(source)
     }
 
-    protected final def setValue(v: T): Unit = {
+    protected final def setValue(v: A1): Unit = {
       assert(
         state != Evaluated,
         "Already evaluated (trying to set value to " + v + "): " + toString
@@ -192,7 +193,7 @@ abstract class EvaluateSettings[ScopeType] {
       calledBy.clear()
     }
 
-    final def call(by: BindNode[_, T]): Unit = synchronized {
+    final def call(by: BindNode[_, A1]): Unit = synchronized {
       registerIfNew()
       state match {
         case Evaluated => submitCallComplete(by, value)
@@ -204,29 +205,29 @@ abstract class EvaluateSettings[ScopeType] {
 
     protected def dependsOn: Seq[INode[_]]
     protected def evaluate0(): Unit
-  }
+  end INode
 
-  private[this] def strictConstant[T](v: T): INode[T] = constant(() => v)
+  private[this] def strictConstant[A1](v: A1): INode[A1] = constant(() => v)
 
-  private[this] def constant[T](f: () => T): INode[T] =
-    new MixedNode[ConstK[Unit]#l, T]((), _ => f(), AList.empty)
+  private[this] def constant[A1](f: () => A1): INode[A1] =
+    MixedNode[[F[_]] =>> Unit, A1]((), _ => f(), AList.empty)
 
-  private[this] def single[S, T](in: INode[S], f: S => T): INode[T] =
-    new MixedNode[λ[L[x] => L[S]], T](in, f, AList.single[S])
+  private[this] def single[A1, A2](in: INode[A1], f: A1 => A2): INode[A2] =
+    MixedNode[[F[_]] =>> F[A1], A2](in, f, AList.single[A1])
 
-  private[this] final class BindNode[S, T](in: INode[S], f: S => INode[T]) extends INode[T] {
-    protected def dependsOn = in :: Nil
+  private[this] final class BindNode[A1, A2](in: INode[A1], f: A1 => INode[A2]) extends INode[A2]:
+    protected def dependsOn: Seq[INode[_]] = in :: Nil
     protected def evaluate0(): Unit = makeCall(this, f(in.get))
-    def callComplete(value: T): Unit = synchronized {
+    def callComplete(value: A2): Unit = synchronized {
       assert(isCalling, "Invalid state for callComplete(" + value + "): " + toString)
       setValue(value)
     }
-  }
+  end BindNode
 
-  private[this] final class MixedNode[K[L[x]], T](in: K[INode], f: K[Id] => T, alist: AList[K])
-      extends INode[T] {
-    protected def dependsOn = alist.toList(in)
-    protected def evaluate0(): Unit = setValue(f(alist.transform(in, getValue)))
-  }
-}
- */
+  private[this] final class MixedNode[K[L[x]], A1](in: K[INode], f: K[Id] => A1, alist: AList[K])
+      extends INode[A1]:
+    protected override def dependsOn: Seq[INode[_]] = alist.toList(in)
+    protected override def evaluate0(): Unit = setValue(f(alist.transform(in) { getValue }))
+  end MixedNode
+
+end EvaluateSettings

util-collection/src/main/scala/sbt/internal/util/TypeFunctions.scala

@@ -15,7 +15,9 @@ trait TypeFunctions:
   import TypeFunctions._
   sealed trait Const[A] { type Apply[B] = A }
   sealed trait ConstK[A] { type l[L[x]] = A }
+  type ConstK[A] = [F[_]] =>> A
    */
+
   sealed trait Compose[A[_], B[_]] { type Apply[T] = A[B[T]] }
 
   sealed trait ∙[A[_], B[_]] { type l[T] = A[B[T]] }
@@ -47,7 +49,6 @@ trait TypeFunctions:
   type ~>|[A[_], B[_]] = A ~> Compose[Option, B]#Apply
    */
   type ~>|[F1[_], F2[_]] = [A] => F1[A] => Option[F2[A]]
-
 end TypeFunctions
 
 /*

util-collection/src/test/scala/SettingsExample.scala

@@ -25,12 +25,11 @@ case class SettingsExample() extends Init[Scope] {
   })
 
   // A sample delegation function that delegates to a Scope with a lower index.
-  val delegates: Scope => Seq[Scope] = {
-    case s @ Scope(index, proj) =>
-      s +: (if (index <= 0) Nil
-            else {
-              (if (proj > 0) List(Scope(index)) else Nil) ++: delegates(Scope(index - 1))
-            })
+  val delegates: Scope => Seq[Scope] = { case s @ Scope(index, proj) =>
+    s +: (if (index <= 0) Nil
+          else {
+            (if (proj > 0) List(Scope(index)) else Nil) ++: delegates(Scope(index - 1))
+          })
   }
 
   // Not using this feature in this example.
@@ -39,7 +38,7 @@ case class SettingsExample() extends Init[Scope] {
   // These three functions + a scope (here, Scope) are sufficient for defining our settings system.
 }
 
-/** Usage Example **/
+/** Usage Example * */
 case class SettingsUsage(val settingsExample: SettingsExample) {
   import settingsExample._
 
@@ -73,25 +72,25 @@ case class SettingsUsage(val settingsExample: SettingsExample) {
 	}*/
 
   /**
- * Output:
- * For the None results, we never defined the value and there was no value to delegate to.
- * For a3, we explicitly defined it to be 3.
- * a4 wasn't defined, so it delegates to a3 according to our delegates function.
- * b4 gets the value for a4 (which delegates to a3, so it is 3) and multiplies by 3
- * a5 is defined as the previous value of a5 + 1 and
- *   since no previous value of a5 was defined, it delegates to a4, resulting in 3+1=4.
- * b5 isn't defined explicitly, so it delegates to b4 and is therefore equal to 9 as well
- * a0 = None
- * b0 = None
- * a1 = None
- * b1 = None
- * a2 = None
- * b2 = None
- * a3 = Some(3)
- * b3 = None
- * a4 = Some(3)
- * b4 = Some(9)
- * a5 = Some(4)
- * b5 = Some(9)
- */
+   * Output:
+   * For the None results, we never defined the value and there was no value to delegate to.
+   * For a3, we explicitly defined it to be 3.
+   * a4 wasn't defined, so it delegates to a3 according to our delegates function.
+   * b4 gets the value for a4 (which delegates to a3, so it is 3) and multiplies by 3
+   * a5 is defined as the previous value of a5 + 1 and
+   *   since no previous value of a5 was defined, it delegates to a4, resulting in 3+1=4.
+   * b5 isn't defined explicitly, so it delegates to b4 and is therefore equal to 9 as well
+   * a0 = None
+   * b0 = None
+   * a1 = None
+   * b1 = None
+   * a2 = None
+   * b2 = None
+   * a3 = Some(3)
+   * b3 = None
+   * a4 = Some(3)
+   * b4 = Some(9)
+   * a5 = Some(4)
+   * b5 = Some(9)
+   */
 }