Add package-scoped options and manifest attribute.

See scalapb/scalapb-validate#70

Author: thesamet

build.sbt

@@ -12,6 +12,7 @@ def commonProtos =
   ProtosProject(
     "com.google.api.grpc" % "proto-google-common-protos" % "1.18.1",
     grpc = true,
+    protoPackage = "google",
     buildNumber = 0
   )
 lazy val commonProtos09 = commonProtos.scalapb09
@@ -21,6 +22,7 @@ lazy val commonProtos11 = commonProtos.scalapb11
 val cloudPubSub = ProtosProject(
   "com.google.api.grpc" % "proto-google-cloud-pubsub-v1" % "1.92.3",
   grpc = true,
+  protoPackage = "google",
   buildNumber = 0
 ).dependsOn(commonProtos)
 lazy val cloudPubSub09 = cloudPubSub.scalapb09
@@ -30,6 +32,7 @@ lazy val cloudPubSub11 = cloudPubSub.scalapb11
 val pgvProto = ProtosProject(
   "io.envoyproxy.protoc-gen-validate" % "pgv-java-stub" % "0.4.1",
   grpc = false,
+  protoPackage = "validate",
   packageName = Some("pgv-proto"),
   buildNumber = 0
 )

project/BuildHelpers.scala

@@ -15,6 +15,7 @@ object NoProcessLogger extends ProcessLogger {
 final case class ProtosProject(
     module: ModuleID,
     grpc: Boolean,
+    protoPackage: String,
     buildNumber: Int = 0,
     packageName: Option[String] = None,
     dependencies: Seq[ProtosProject] = Seq.empty
@@ -27,6 +28,8 @@ final case class ProtosProject(
 
     val projectName = module.name + scalapbMajorMinor.replace('.', '_')
 
+    val optionsFile = protoPackage.replace('.', '/') + "/scalapb-options.proto"
+
     sbt
       .Project(projectName, new File(projectName))
       .settings(
@@ -67,7 +70,38 @@ final case class ProtosProject(
         publish / skip := (sys.env
           .getOrElse("PUBLISH_ONLY", basePackageName) != basePackageName),
         sonatypeBundleDirectory := (ThisBuild / baseDirectory).value / "target" / "sonatype-staging",
-        publishArtifact in (Compile, packageDoc) := scalaVersion.value != Scala3
+        publishArtifact in (Compile, packageDoc) := scalaVersion.value != Scala3,
+        Compile / resourceGenerators += Def.task {
+
+          val packageOptionsFile =
+            (Compile / resourceManaged).value / optionsFile
+          IO.write(
+            packageOptionsFile,
+            s"""|// This file is generated by ScalaPB/common-protos project/BuildHelpers.scala.
+                |// It is added as an input in user's builds to ensure the protos shipped with
+                |// this jar are interpreted with the original generator options, and not influenced
+                |// by generator options in the user's build.
+                |
+                |syntax = "proto3";
+                |package $protoPackage;
+                |
+                |import "scalapb/scalapb.proto";
+                |option (scalapb.options) = {
+                |  scope: PACKAGE
+                |  flat_package: false
+                |  lenses: true
+                |  // java_conversions as a file-level option is only introduced in 0.10.11
+                |  // so it is not yet included here for backwards-compatiblity.
+                |  // java_conversions: true
+                |  preserve_unknown_fields: true
+                |};
+            """.stripMargin
+          )
+          Seq(packageOptionsFile)
+        }.taskValue,
+        Compile / packageBin / packageOptions += {
+          Package.ManifestAttributes("ScalaPB-Options-Proto" -> optionsFile)
+        }
       )
   }
 
@@ -77,7 +111,7 @@ final case class ProtosProject(
     )
 
   val scalapb10: Project =
-    protoProject("0.10.10").dependsOn(
+    protoProject("0.10.11").dependsOn(
       dependencies.map(d => ClasspathDependency(d.scalapb10, None)): _*
     )