mirror of https://github.com/sbt/sbt.git
44 lines
1.6 KiB
Scala
44 lines
1.6 KiB
Scala
package sbt
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package std
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import Def.{Initialize,Setting}
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import Types.{idFun,Id}
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import appmacro.{Convert, Instance, MixedBuilder, MonadInstance}
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object InitializeInstance extends MonadInstance
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{
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type M[x] = Initialize[x]
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def app[K[L[x]], Z](in: K[Initialize], f: K[Id] => Z)(implicit a: AList[K]): Initialize[Z] = Def.app[K,Z](in)(f)(a)
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def map[S,T](in: Initialize[S], f: S => T): Initialize[T] = Def.map(in)(f)
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def flatten[T](in: Initialize[Initialize[T]]): Initialize[T] = Def.bind(in)(idFun[Initialize[T]])
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def pure[T](t: () => T): Initialize[T] = Def.pure(t)
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}
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object InitializeConvert extends Convert
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{
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def apply[T: c.TypeTag](c: reflect.makro.Context)(in: c.Tree): c.Tree =
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if(in.tpe <:< c.typeOf[Initialize[Task[T]]] || in.tpe <:< c.typeOf[Task[T]])
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c.abort(in.pos, "A setting cannot depend on a task")
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else if(in.tpe <:< c.typeOf[Initialize[T]])
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{
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val i = c.Expr[Initialize[T]](in)
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c.universe.reify( i.splice ).tree
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}
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else
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c.abort(in.pos, "Unknown input type: " + in.tpe)
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}
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import language.experimental.macros
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import scala.reflect._
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import makro._
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object SettingMacro
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{
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def setting[T](t: T): Initialize[T] = macro settingMacroImpl[T]
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def settingMacroImpl[T: c.TypeTag](c: Context)(t: c.Expr[T]): c.Expr[Initialize[T]] =
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Instance.contImpl[T](c, InitializeInstance, InitializeConvert, MixedBuilder)(Left(t))
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def settingDyn[T](t: Initialize[T]): Initialize[T] = macro settingDynMacroImpl[T]
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def settingDynMacroImpl[T: c.TypeTag](c: Context)(t: c.Expr[Initialize[T]]): c.Expr[Initialize[T]] =
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Instance.contImpl[T](c, InitializeInstance, InitializeConvert, MixedBuilder)(Right(t))
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}
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