mirror of https://github.com/sbt/sbt.git
50 lines
1.8 KiB
Scala
50 lines
1.8 KiB
Scala
/* sbt -- Simple Build Tool
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* Copyright 2010 Mark Harrah
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*/
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package sbt
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import Types._
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import Task._
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// Action, Task, and Info are intentionally invariant in their type parameter.
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// Various natural transformations used, such as PMap, require invariant type constructors for correctness
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sealed trait Action[T]
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final case class Pure[T](f: () => T) extends Action[T]
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final case class Mapped[T, In <: HList](in: Tasks[In], f: Results[In] => T) extends Action[T]
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final case class FlatMapped[T, In <: HList](in: Tasks[In], f: Results[In] => Task[T]) extends Action[T]
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final case class DependsOn[T](in: Task[T], deps: Seq[Task[_]]) extends Action[T]
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final case class Join[T, U](in: Seq[Task[U]], f: Seq[Result[U]] => Either[Task[T], T]) extends Action[T]
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object Task
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{
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type Tasks[HL <: HList] = KList[Task, HL]
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type Results[HL <: HList] = KList[Result, HL]
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}
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final case class Task[T](info: Info[T], work: Action[T])
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{
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def original = info.original getOrElse this
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override def toString = info.name orElse original.info.name getOrElse ("Task(" + info + ")")
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}
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/** `original` is used during transformation only.*/
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final case class Info[T](attributes: AttributeMap = AttributeMap.empty, original: Option[Task[T]] = None)
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{
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import Info._
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def name = attributes.get(Name)
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def description = attributes.get(Description)
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def setName(n: String) = set(Name, n)
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def setDescription(d: String) = set(Description, d)
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def set[T](key: AttributeKey[T], value: T) = copy(attributes = this.attributes.put(key, value))
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override def toString =
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if(attributes.isEmpty && original.isEmpty)
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"_"
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else
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attributes.toString + (original match { case Some(o) => ", original: " + o; case None => "" })
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}
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object Info
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{
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val Name = AttributeKey[String]("name")
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val Description = AttributeKey[String]("description")
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} |