WIP

samples/android-multi-module/dinosaurs/build.gradle.kts

@@ -0,0 +1,42 @@
+plugins {
+  id("com.android.library")
+  id("org.jetbrains.kotlin.android")
+  id("com.squareup.wire")
+}
+
+buildscript {
+  repositories {
+    mavenCentral()
+    google()
+  }
+  dependencies {
+    classpath(libs.pluginz.android)
+    classpath("com.squareup.wire:wire-gradle-plugin")
+  }
+}
+
+android {
+  namespace = "com.squareup.wire.android.app.multi.dinosaurs"
+}
+
+dependencies {
+  implementation(libs.androidx.appcompat)
+  implementation(libs.androidx.constraintLayout)
+  implementation(libs.androidMaterial)
+  testImplementation(libs.junit)
+}
+
+wire {
+  sourcePath {
+    srcDir("src/main/proto")
+  }
+
+  sourcePath {
+    srcProject(":samples:android-multi-module:location")
+    include("squareup/location/continent.proto")
+  }
+
+  kotlin {
+    out = "src/main/kotlin"
+  }
+}

samples/android-multi-module/dinosaurs/src/main/proto/squareup/dinosaurs/dinosaur.proto

@@ -0,0 +1,21 @@
+syntax = "proto2";
+
+package squareup.dinosaurs;
+
+option java_package = "com.squareup.dinosaurs";
+
+import "squareup/geology/period.proto";
+import "squareup/location/continent.proto";
+
+message Dinosaur {
+  /** Common name of this dinosaur, like "Stegosaurus". */
+  optional string name = 1;
+
+  /** URLs with images of this dinosaur. */
+  repeated string picture_urls = 2;
+
+  optional double length_meters = 3;
+  optional double mass_kilograms = 4;
+  optional squareup.geology.Period period = 5;
+  optional squareup.location.Continent continent = 6;
+}

samples/android-multi-module/geology/build.gradle.kts

@@ -0,0 +1,34 @@
+plugins {
+  id("com.android.library")
+  id("org.jetbrains.kotlin.android")
+  id("com.squareup.wire")
+}
+
+buildscript {
+  repositories {
+    mavenCentral()
+    google()
+  }
+  dependencies {
+    classpath(libs.pluginz.android)
+    classpath("com.squareup.wire:wire-gradle-plugin")
+  }
+}
+
+android {
+  namespace = "com.squareup.wire.android.app.multi.geology"
+}
+
+dependencies {
+  implementation(libs.androidx.appcompat)
+  implementation(libs.androidx.constraintLayout)
+  implementation(libs.androidMaterial)
+  testImplementation(libs.junit)
+}
+
+wire {
+  protoLibrary = true
+
+  kotlin {
+  }
+}

samples/android-multi-module/geology/src/main/proto/squareup/geology/period.proto

@@ -0,0 +1,16 @@
+syntax = "proto2";
+
+package squareup.geology;
+
+option java_package = "com.squareup.geology";
+
+enum Period {
+  /** 145.5 million years ago — 66.0 million years ago. */
+  CRETACEOUS = 1;
+
+  /** 201.3 million years ago — 145.0 million years ago. */
+  JURASSIC = 2;
+
+  /** 252.17 million years ago — 201.3 million years ago. */
+  TRIASSIC = 3;
+}

samples/android-multi-module/location/build.gradle.kts

@@ -0,0 +1,55 @@
+plugins {
+  id("com.android.library")
+  id("org.jetbrains.kotlin.android")
+  id("com.squareup.wire")
+  id("maven-publish")
+}
+
+buildscript {
+  repositories {
+    mavenCentral()
+    google()
+  }
+  dependencies {
+    classpath(libs.pluginz.android)
+    classpath("com.squareup.wire:wire-gradle-plugin")
+  }
+}
+
+android {
+  namespace = "com.squareup.wire.android.app.multi.location"
+
+  publishing {
+    singleVariant("debug") {
+      withSourcesJar()
+    }
+  }
+}
+
+publishing {
+  publications {
+    create("debug", MavenPublication::class.java) {
+      groupId = "com.my-company"
+      artifactId = "my-library"
+      version = "1.0"
+
+      afterEvaluate {
+        from(components.getByName("debug"))
+      }
+    }
+  }
+}
+
+dependencies {
+  implementation(libs.androidx.appcompat)
+  implementation(libs.androidx.constraintLayout)
+  implementation(libs.androidMaterial)
+  testImplementation(libs.junit)
+}
+
+wire {
+  protoLibrary = true
+
+  kotlin {
+  }
+}

samples/android-multi-module/location/src/main/kotlin/london/Main.kt

@@ -0,0 +1,20 @@
+/*
+ * Copyright (C) 2024 Square, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package london
+
+fun main() {
+  println("hello")
+}

samples/android-multi-module/location/src/main/proto/squareup/location/continent.proto

@@ -0,0 +1,14 @@
+syntax = "proto2";
+
+package squareup.location;
+
+option java_package = "com.squareup.location";
+
+enum Continent {
+  AFRICA = 0;
+  AMERICA = 1;
+  ANTARCTICA = 2;
+  ASIA = 3;
+  AUSTRALIA = 4;
+  EUROPE = 5;
+}

samples/android-multi-module/location/src/main/proto/squareup/location/planet.proto

@@ -0,0 +1,16 @@
+syntax = "proto2";
+
+package squareup.location;
+
+option java_package = "com.squareup.location";
+
+enum Planet {
+  MERCURY = 0;
+  VENUS = 1;
+  EARTH = 2;
+  MARS = 3;
+  JUPITER = 4;
+  SATURN = 5;
+  URANUS = 6;
+  NEPTUNE = 7;
+}

settings.gradle.kts

@@ -44,7 +44,7 @@ include(":wire-bom")
 include(":wire-compiler")
 include(":wire-golden-files")
 include(":wire-gradle-plugin")
-include(":wire-gradle-plugin-playground")
+// include(":wire-gradle-plugin-playground")
 include(":wire-grpc-client")
 include(":wire-grpc-mockwebserver")
 include(":wire-grpc-tests")
@@ -77,9 +77,12 @@ if (startParameter.projectProperties.get("swift") != "false") {
 // include(":samples:android-lib-java-sample")
 // include(":samples:android-lib-kotlin-sample")
 // include(":samples:js")
-include(":samples:multi-platform-multi-module:dinosaurs-native")
-include(":samples:multi-platform-multi-module:geology-native")
-include(":samples:multi-platform-multi-module:location-js")
+// include(":samples:multi-platform-multi-module:dinosaurs-native")
+// include(":samples:multi-platform-multi-module:geology-native")
+// include(":samples:multi-platform-multi-module:location-js")
+include(":samples:android-multi-module:dinosaurs")
+include(":samples:android-multi-module:geology")
+include(":samples:android-multi-module:location")
 // include(":samples:native")
 // include(":samples:wire-codegen-sample")
 // include(":samples:wire-grpc-sample:client")
@@ -88,6 +91,6 @@ include(":samples:multi-platform-multi-module:location-js")
 // include(":samples:wire-grpc-sample:server-plain")
 // include(":wire-benchmarks")
 // include(":wire-golden-files")
-include(":wire-gradle-plugin-playground")
+// include(":wire-gradle-plugin-playground")
 // include(":wire-grpc-tests")
 // include(":wire-protoc-compatibility-tests")

wire-gradle-plugin/src/main/kotlin/com/squareup/wire/gradle/WireExtension.kt

@@ -15,15 +15,19 @@
  */
 package com.squareup.wire.gradle
 
+import com.android.build.api.attributes.BuildTypeAttr
+import com.android.build.gradle.internal.attributes.VariantAttr
 import com.squareup.wire.schema.EventListener
 import java.io.File
+import java.io.Serializable
 import org.gradle.api.Action
 import org.gradle.api.Project
 import org.gradle.api.artifacts.MinimalExternalModuleDependency
 import org.gradle.api.internal.catalog.DelegatingProjectDependency
 import org.gradle.api.internal.file.FileOrUriNotationConverter
 import org.gradle.api.provider.Provider
 import org.gradle.api.provider.ProviderConvertible
+import org.jetbrains.kotlin.gradle.plugin.KotlinPlatformType
 
 open class WireExtension(
   private val project: Project,
@@ -285,6 +289,12 @@ open class WireExtension(
       .apply {
         isCanBeConsumed = false
         isTransitive = false
+          attributes { attributesContainer ->
+            attributesContainer.attribute(
+              BuildTypeAttr.ATTRIBUTE,
+              project.objects.named(BuildTypeAttr::class.java, "debug")
+            )
+          }
       }
     internal val sourceDirectoriesAndLocalJars = mutableListOf<File>()
 

wire-gradle-plugin/src/main/kotlin/com/squareup/wire/gradle/WirePlugin.kt

@@ -17,6 +17,8 @@
 
 package com.squareup.wire.gradle
 
+import java.lang.reflect.Array as JavaArray
+import com.android.build.api.attributes.BuildTypeAttr
 import com.squareup.wire.VERSION
 import com.squareup.wire.gradle.internal.libraryProtoOutputPath
 import com.squareup.wire.gradle.internal.targetDefaultOutputPath
@@ -26,7 +28,6 @@ import com.squareup.wire.schema.ProtoTarget
 import com.squareup.wire.schema.Target
 import com.squareup.wire.schema.newEventListenerFactory
 import java.io.File
-import java.lang.reflect.Array as JavaArray
 import java.util.concurrent.atomic.AtomicBoolean
 import org.gradle.api.Plugin
 import org.gradle.api.Project
@@ -37,6 +38,7 @@ import org.gradle.api.tasks.SourceSetContainer
 import org.gradle.api.tasks.compile.JavaCompile
 import org.jetbrains.kotlin.gradle.dsl.KotlinJsProjectExtension
 import org.jetbrains.kotlin.gradle.dsl.KotlinMultiplatformExtension
+import org.jetbrains.kotlin.gradle.dsl.KotlinProjectExtension
 import org.jetbrains.kotlin.gradle.plugin.KotlinPlatformType
 import org.jetbrains.kotlin.gradle.plugin.sources.DefaultKotlinSourceSet
 import org.jetbrains.kotlin.gradle.tasks.AbstractKotlinCompile
@@ -68,7 +70,11 @@ class WirePlugin : Plugin<Project> {
         // TODO(Benoit) If another project, on which this one depends, exposes multiple variants,
         //  Wire won't be able to pick one. We force the resolution to JVM. On the other hand, this
         //  breaks inter-module dependencies for non-jvm modules. We need to fix it.
-        attributesContainer.attribute(KotlinPlatformType.attribute, KotlinPlatformType.jvm)
+        attributesContainer.attribute(KotlinPlatformType.attribute, KotlinPlatformType.androidJvm)
+        attributesContainer.attribute(
+          BuildTypeAttr.ATTRIBUTE,
+          project.objects.named(BuildTypeAttr::class.java, "debug"),
+        )
       }
     }
 
@@ -120,7 +126,8 @@ class WirePlugin : Plugin<Project> {
 
     val protoSourceConfiguration = project.configurations.getByName("protoSource")
     val protoPathConfiguration = project.configurations.getByName("protoPath")
-    val projectDependenciesJvmConfiguration = project.configurations.getByName("protoProjectDependenciesJvm")
+    val projectDependenciesJvmConfiguration =
+      project.configurations.getByName("protoProjectDependenciesJvm")
 
     val outputs = extension.outputs
     check(outputs.isNotEmpty()) {
@@ -258,7 +265,8 @@ class WirePlugin : Plugin<Project> {
         task.projectDirProperty.set(project.layout.projectDirectory)
         task.buildDirProperty.set(project.layout.buildDirectory)
 
-        val factories = extension.eventListenerFactories + extension.eventListenerFactoryClasses().map(::newEventListenerFactory)
+        val factories = extension.eventListenerFactories + extension.eventListenerFactoryClasses()
+          .map(::newEventListenerFactory)
         task.eventListenerFactories.set(factories)
       }
 
@@ -271,17 +279,27 @@ class WirePlugin : Plugin<Project> {
 
       val protoOutputDirectory = task.map { it.protoLibraryOutput }
       if (extension.protoLibrary) {
-        val sourceSets = project.extensions.getByType(SourceSetContainer::class.java)
-        // Note that there are no source sets for some platforms such as native.
-        // TODO(Benoit) Probably should be checking for other names than `main`. As well, source
-        //  sets might be created 'afterEvaluate'. Does that mean we should do this work in
-        //  `afterEvaluate` as well? See: https://kotlinlang.org/docs/multiplatform-dsl-reference.html#source-sets
-        if (sourceSets.findByName("main") != null) {
-          sourceSets.getByName("main") { main: SourceSet ->
-            main.resources.srcDir(protoOutputDirectory)
+        val sourceContainerNames = project.extensions.extensionsSchema.map { it.name }
+        sourceContainerNames.forEach { sourceContainerName ->
+          val extension = project.extensions.getByName(sourceContainerName)
+          when (extension) {
+            is SourceSetContainer -> {
+              extension.findByName("main")?.let { main: SourceSet ->
+                main.resources.srcDir(protoOutputDirectory)
+              }
+            }
+
+            is KotlinProjectExtension -> {
+              extension.sourceSets.findByName("main")?.resources?.srcDir(protoOutputDirectory)
+            }
+
+            else -> {
+              project.logger.warn(
+                "${project.displayName} doesn't have a 'main' source sets. The .proto files will not automatically be added to the artifact.",
+              )
+            }
           }
-        } else {
-          project.logger.warn("${project.displayName} doesn't have a 'main' source sets. The .proto files will not automatically be added to the artifact.")
+          (project.extensions.getByName("kotlin") as? KotlinProjectExtension)?.sourceSets
         }
       }