fix: only use semiauto derivation

On large APIs this can dramatically speed up compilation.

Author: plaflamme

modules/openapi-generator/src/main/resources/scala-sttp4/model.mustache

@@ -36,6 +36,16 @@ case class {{classname}}(
   {{! Empty case class for models with no properties }}
   {{/allVars}}
 ) extends {{vendorExtensions.x-oneOfParent}}
+{{#circe}}
+object {{classname}} {
+  import io.circe._
+  import io.circe.syntax._
+  import io.circe.generic.semiauto._
+
+  implicit val encoder: Encoder[{{classname}}] = deriveEncoder
+  implicit val decoder: Decoder[{{classname}}] = deriveDecoder
+}
+{{/circe}}
 
 {{/vendorExtensions.x-oneOfMembers}}
 object {{classname}} {
@@ -90,7 +100,6 @@ object {{classname}} {
   // oneOf without discriminator - using semiauto derivation
   import io.circe.{Encoder, Decoder}
   import io.circe.generic.semiauto._
-  import io.circe.generic.auto._
 
   implicit val encoder: Encoder[{{classname}}] = deriveEncoder
   implicit val decoder: Decoder[{{classname}}] = deriveDecoder
@@ -100,7 +109,6 @@ object {{classname}} {
   import io.circe.{Encoder, Decoder}
   import io.circe.generic.extras._
   import io.circe.generic.extras.semiauto._
-  import io.circe.generic.auto._
 
   private implicit val config: Configuration = Configuration.default.withDiscriminator("{{discriminator.propertyName}}")
     .copy(
@@ -185,6 +193,16 @@ case class {{classname}}(
   {{/vars}}
 ){{#parent}} extends {{parent}}{{/parent}}
 {{/isEnum}}
+{{#circe}}
+object {{classname}} {
+  import io.circe._
+  import io.circe.syntax._
+  import io.circe.generic.semiauto._
+
+  implicit val encoder: Encoder[{{classname}}] = deriveEncoder
+  implicit val decoder: Decoder[{{classname}}] = deriveDecoder
+}
+{{/circe}}
 {{#hasEnums}}
 object {{classname}}Enums {
   {{#vars}}

samples/client/petstore/scala-sttp4-circe/src/main/scala/org/openapitools/client/model/ApiResponse.scala

@@ -21,3 +21,11 @@ case class ApiResponse(
   `type`: Option[String] = None,
   message: Option[String] = None
 )
+object ApiResponse {
+  import io.circe._
+  import io.circe.syntax._
+  import io.circe.generic.semiauto._
+
+  implicit val encoder: Encoder[ApiResponse] = deriveEncoder
+  implicit val decoder: Decoder[ApiResponse] = deriveDecoder
+}

samples/client/petstore/scala-sttp4-circe/src/main/scala/org/openapitools/client/model/Category.scala

@@ -20,3 +20,11 @@ case class Category(
   id: Option[Long] = None,
   name: Option[String] = None
 )
+object Category {
+  import io.circe._
+  import io.circe.syntax._
+  import io.circe.generic.semiauto._
+
+  implicit val encoder: Encoder[Category] = deriveEncoder
+  implicit val decoder: Decoder[Category] = deriveDecoder
+}

samples/client/petstore/scala-sttp4-circe/src/main/scala/org/openapitools/client/model/Order.scala

@@ -26,6 +26,14 @@ case class Order(
   status: Option[OrderEnums.Status] = None,
   complete: Option[Boolean] = None
 )
+object Order {
+  import io.circe._
+  import io.circe.syntax._
+  import io.circe.generic.semiauto._
+
+  implicit val encoder: Encoder[Order] = deriveEncoder
+  implicit val decoder: Decoder[Order] = deriveDecoder
+}
 object OrderEnums {
 
   sealed trait Status

samples/client/petstore/scala-sttp4-circe/src/main/scala/org/openapitools/client/model/Pet.scala

@@ -25,6 +25,14 @@ case class Pet(
   /* pet status in the store */
   status: Option[PetEnums.Status] = None
 )
+object Pet {
+  import io.circe._
+  import io.circe.syntax._
+  import io.circe.generic.semiauto._
+
+  implicit val encoder: Encoder[Pet] = deriveEncoder
+  implicit val decoder: Decoder[Pet] = deriveDecoder
+}
 object PetEnums {
 
   sealed trait Status

samples/client/petstore/scala-sttp4-circe/src/main/scala/org/openapitools/client/model/Tag.scala

@@ -20,3 +20,11 @@ case class Tag(
   id: Option[Long] = None,
   name: Option[String] = None
 )
+object Tag {
+  import io.circe._
+  import io.circe.syntax._
+  import io.circe.generic.semiauto._
+
+  implicit val encoder: Encoder[Tag] = deriveEncoder
+  implicit val decoder: Decoder[Tag] = deriveDecoder
+}

samples/client/petstore/scala-sttp4-circe/src/main/scala/org/openapitools/client/model/User.scala

@@ -27,3 +27,11 @@ case class User(
   /* User Status */
   userStatus: Option[Int] = None
 )
+object User {
+  import io.circe._
+  import io.circe.syntax._
+  import io.circe.generic.semiauto._
+
+  implicit val encoder: Encoder[User] = deriveEncoder
+  implicit val decoder: Decoder[User] = deriveDecoder
+}