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Implement Local and Ask Instances #662

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merged 1 commit into from
Apr 25, 2023
Merged

Implement Local and Ask Instances #662

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10 changes: 10 additions & 0 deletions zio-interop-cats-tests/shared/src/test/scala/zio/interop/CatsMtlSpec.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,16 @@ class CatsMtlSpec extends ZioSpecBase {
type Ctx = String
type Error = String

checkAllAsync(
"Ask[ZIO[Ctx, Error, _]]",
implicit tc => AskTests[ZIO[Ctx, Error, _], ZEnvironment[Ctx]].ask[Ctx]
)

checkAllAsync(
"Local[ZIO[Ctx, Error, _]]",
implicit tc => LocalTests[ZIO[Ctx, Error, _], ZEnvironment[Ctx]].local[ZEnvironment[Ctx], Int]
)

checkAllAsync(
"Raise[ZIO[Ctx, Error, _]]",
implicit tc => RaiseTests[ZIO[Ctx, Error, _], Error].raise[Int]
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3 changes: 3 additions & 0 deletions zio-interop-cats-tests/shared/src/test/scala/zio/interop/CatsSpecBase.scala
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Expand Up @@ -264,4 +264,7 @@ private[interop] sealed trait CatsSpecBaseLowPriority { this: CatsSpecBase =>

implicit def arbitraryZEnvironment[R: Arbitrary: Tag]: Arbitrary[ZEnvironment[R]] =
Arbitrary(Arbitrary.arbitrary[R].map(ZEnvironment(_)))

implicit def eqForZEnvironment[R]: Eq[ZEnvironment[R]] =
Eq.fromUniversalEquals
}
16 changes: 15 additions & 1 deletion zio-interop-cats/shared/src/main/scala/zio/interop/catsmtl.scala
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Expand Up @@ -18,13 +18,27 @@ package zio.interop

import cats.Applicative
import cats.mtl.*
import zio.{ CanFail, ZIO }
import zio.{ CanFail, ZEnvironment, ZIO }
import zio.internal.stacktracer.InteropTracer

abstract class CatsMtlPlatform extends CatsMtlInstances

abstract class CatsMtlInstances {

implicit def zioLocal[R, E](implicit ev: Applicative[ZIO[R, E, _]]): Local[ZIO[R, E, _], ZEnvironment[R]] =
new Local[ZIO[R, E, _], ZEnvironment[R]] {
override def applicative: Applicative[ZIO[R, E, _]] = ev
override def ask[E2 >: ZEnvironment[R]]: ZIO[R, E, E2] = ZIO.environment
override def local[A](fa: ZIO[R, E, A])(f: ZEnvironment[R] => ZEnvironment[R]): ZIO[R, E, A] =
fa.provideSomeEnvironment(f)(InteropTracer.newTrace(f))
}

implicit def zioAsk[R1, R <: R1, E](implicit ev: Applicative[ZIO[R, E, _]]): Ask[ZIO[R, E, _], ZEnvironment[R1]] =
new Ask[ZIO[R, E, _], ZEnvironment[R1]] {
override def applicative: Applicative[ZIO[R, E, _]] = ev
override def ask[R2 >: ZEnvironment[R1]]: ZIO[R, E, R2] = ZIO.environment
}

implicit def zioHandle[R, E](implicit ev: Applicative[ZIO[R, E, _]]): Handle[ZIO[R, E, _], E] =
new Handle[ZIO[R, E, _], E] {
override def applicative: Applicative[ZIO[R, E, _]] = ev
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