move scalapb-validation sbt instructions to scripted

docs/src/main/paradox/apidesign.md

@@ -51,15 +51,7 @@ Follow the [documentation](https://scalapb.github.io/docs/validation) to update
 in order to generate the validators using `sbt-protoc` (@ref[used by Akka gRPC](buildtools/sbt.md#sbt-protoc-settings)).
 
 With the default parameters and target set by Akka gRPC, additions to your `build.sbt` should be:
-```scala
-import scalapb.GeneratorOption._
-
-libraryDependencies +=
-  "com.thesamet.scalapb" %% "scalapb-validate-core" % scalapb.validate.compiler.BuildInfo.version % "protobuf"
-
-Compile / PB.targets +=
-  scalapb.validate.gen(FlatPackage) -> (Compile / akkaGrpcCodeGeneratorSettings / target).value
-```
+@@snip[build.sbt](/sbt-plugin/src/sbt-test/gen-scala-server/10-scalapb-validate/build.sbt) { #setup }
 
 The `validate_at_construction` option can be particularly interesting in a server-side context
 since method implementations will automatically receive pre-validated requests and will not

sbt-plugin/src/sbt-test/gen-scala-server/10-scalapb-validate/build.sbt

@@ -0,0 +1,13 @@
+resolvers += Resolver.sonatypeRepo("staging")
+resolvers += Resolver.bintrayRepo("akka", "snapshots")
+
+//#setup
+import scalapb.GeneratorOption._
+
+enablePlugins(AkkaGrpcPlugin)
+
+libraryDependencies +=
+  "com.thesamet.scalapb" %% "scalapb-validate-core" % scalapb.validate.compiler.BuildInfo.version % "protobuf"
+Compile / PB.targets +=
+  scalapb.validate.gen(FlatPackage) -> (Compile / akkaGrpcCodeGeneratorSettings / target).value
+//#setup

sbt-plugin/src/sbt-test/gen-scala-server/10-scalapb-validate/project/plugins.sbt

@@ -0,0 +1,3 @@
+addSbtPlugin("com.lightbend.akka.grpc" % "sbt-akka-grpc" % sys.props("project.version"))
+
+libraryDependencies ++= Seq("com.thesamet.scalapb" %% "scalapb-validate-codegen" % "0.2.1")

sbt-plugin/src/sbt-test/gen-scala-server/10-scalapb-validate/src/main/protobuf/helloworld.proto

@@ -0,0 +1,29 @@
+syntax = "proto3";
+
+option java_package = "example.myapp.helloworld.grpc";
+
+package helloworld;
+
+import "validate/validate.proto";
+
+// The greeting service definition.
+service GreeterService {
+    // Sends a greeting
+    rpc SayHello (HelloRequest) returns (HelloReply) {}
+
+    rpc ItKeepsTalking (stream HelloRequest) returns (HelloReply) {}
+
+    rpc ItKeepsReplying (HelloRequest) returns (stream HelloReply) {}
+
+    rpc StreamHellos (stream HelloRequest) returns (stream HelloReply) {}
+}
+
+// The request message containing the user's name.
+message HelloRequest {
+    string name = 1 [(validate.rules).string.min_len = 3];;
+}
+
+// The response message containing the greetings
+message HelloReply {
+    string message = 1;
+}

sbt-plugin/src/sbt-test/gen-scala-server/10-scalapb-validate/src/main/scala/example/myapp/helloworld/GreeterServiceImpl.scala

@@ -0,0 +1,19 @@
+package example.myapp.helloworld
+
+import scala.concurrent.Future
+
+import akka.NotUsed
+import akka.stream.scaladsl.Source
+
+import example.myapp.helloworld.grpc._
+
+class GreeterServiceImpl extends GreeterService {
+  override def sayHello(in: HelloRequest): Future[HelloReply] = ???
+
+  override def streamHellos(in: Source[HelloRequest, NotUsed]): Source[HelloReply, NotUsed] = ???
+
+  override def itKeepsTalking(in: Source[HelloRequest, NotUsed]): Future[HelloReply] = ???
+
+  override def itKeepsReplying(in: HelloRequest): Source[HelloReply, NotUsed] = ???
+
+}

sbt-plugin/src/sbt-test/gen-scala-server/10-scalapb-validate/test

@@ -0,0 +1 @@
+> compile