o

cats.derived

semiauto

object semiauto extends SemiAutoInstances

allows semi automatically derive each instance. The derivation might need help when there are fields with a type constructor that comes with instances, e.g.

scala> case class Bar(a: String)
scala> case class Foo(bars: List[Bar])
scala> import cats.instances.all._

scala> cats.derived.semiauto.show[Foo].show(Foo(List(Bar("a"))))
res1: String = Foo(bars = $colon$colon(head = Bar(a = a), tl$access$1 = Nil.type()))

Note that semi.show didn't respect the native Show[List] instance

You could either derive a Bar instance first

scala> implicit val barShow = cats.derived.semi.show[Bar]

scala> cats.derived.semiauto.show[Foo].show(Foo(List(Bar("a"))))
res2: String = Foo(bars = List(Bar(a = a)))

Or you can take advantage of a controlled auto derivation

 scala> implicit val fooShow: Show[Foo] = { |
           import cats.derived.auto.show._  |
           cats.derived.semiauto.show       |
        }
scala> Foo(List(Bar("a"))).show
res3: String = Foo(bars = List(Bar(a = a)))
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  1. final def !=(arg0: Any): Boolean
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  2. final def ##(): Int
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  4. def applicative[F[_]](implicit F: Lazy[MkApplicative[F]]): Applicative[F]
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  5. def apply[F[_]](implicit F: Lazy[MkApply[F]]): Apply[F]
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  6. final def asInstanceOf[T0]: T0
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  7. def clone(): AnyRef
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  8. def commutativeMonoid[A](implicit ev: Lazy[MkCommutativeMonoid[A]]): CommutativeMonoid[A]
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  9. def commutativeSemigroup[T](implicit ev: Lazy[MkCommutativeSemigroup[T]]): CommutativeSemigroup[T]
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  10. def consK[F[_]](implicit F: Lazy[MkConsK[F, F]]): ConsK[F]
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  11. def contravariant[F[_]](implicit F: Lazy[MkContravariant[F]]): Contravariant[F]
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  12. def empty[A](implicit ev: Lazy[MkEmpty[A]]): Empty[A]
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  13. def emptyK[F[_]](implicit F: Lazy[MkEmptyK[F]]): EmptyK[F]
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  14. def eq[A](implicit ev: Lazy[MkEq[A]]): Eq[A]
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  15. final def eq(arg0: AnyRef): Boolean
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  18. def foldable[F[_]](implicit F: Lazy[MkFoldable[F]]): Foldable[F]
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  19. def functor[F[_]](implicit F: Lazy[MkFunctor[F]]): Functor[F]
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  21. def hash[A](implicit ev: Lazy[MkHash[A]]): Hash[A]
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  25. def iterable[F[_], A](fa: F[A])(implicit F: MkIterable[F]): Iterable[A]
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  26. def monoid[A](implicit ev: Lazy[MkMonoid[A]]): Monoid[A]
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  27. def monoidK[F[_]](implicit F: Lazy[MkMonoidK[F]]): MonoidK[F]
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  28. final def ne(arg0: AnyRef): Boolean
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  29. def nonEmptyTraverse[F[_]](implicit F: Lazy[MkNonEmptyTraverse[F]]): NonEmptyTraverse[F]
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  30. final def notify(): Unit
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  31. final def notifyAll(): Unit
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  32. def order[A](implicit ev: Lazy[MkOrder[A]]): Order[A]
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  33. def partialOrder[A](implicit ev: Lazy[MkPartialOrder[A]]): PartialOrder[A]
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  34. def pure[F[_]](implicit F: Lazy[MkPure[F]]): Pure[F]
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  35. def reducible[F[_]](implicit F: Lazy[MkReducible[F]]): Reducible[F]
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  36. def semigroup[T](implicit ev: Lazy[MkSemigroup[T]]): Semigroup[T]
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  37. def semigroupK[F[_]](implicit F: Lazy[MkSemigroupK[F]]): SemigroupK[F]
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  38. def show[A](implicit ev: Lazy[MkShow[A]]): Show[A]
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  39. def showPretty[A](implicit ev: Lazy[MkShowPretty[A]]): ShowPretty[A]
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  40. final def synchronized[T0](arg0: ⇒ T0): T0
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  41. def toString(): String
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  42. def traverse[F[_]](implicit F: Lazy[MkTraverse[F]]): Traverse[F]
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  43. final def wait(): Unit
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  44. final def wait(arg0: Long, arg1: Int): Unit
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  45. final def wait(arg0: Long): Unit
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