add release Android target by default for KMP

CHANGELOG.md

@@ -2,6 +2,9 @@
 
 ## 0.28.0 **UNRELEASED**
 
+- For Kotlin Multiplatform the main plugin will now automatically publish the
+  `release` variant if the project has an Android target.
+- Support specifying the Android variants to publish in `KotlinMultiplatform(...)`.
 - Updated minimum supported Gradle, Android Gradle Plugin and Kotlin versions.
 - Removed support for the deprecated Kotlin/JS plugin.
 - Removed the deprecated `closeAndReleaseRepository` task. Use `releaseRepository`, which

docs/what.md

@@ -196,8 +196,10 @@ For projects using the `org.jetbrains.kotlin.multiplatform` plugin.
       // - `JavadocJar.None()` don't publish this artifact
       // - `JavadocJar.Empty()` publish an emprt jar
       // - `JavadocJar.Dokka("dokkaHtml")` when using Kotlin with Dokka, where `dokkaHtml` is the name of the Dokka task that should be used as input
-      // sources publishing is always enabled by the Kotlin Multiplatform plugin
-      configure(new KotlinMultiplatform(new JavadocJar.Dokka("dokkaHtml")))
+      // the second whether to publish a sources jar
+      // the third parameters configures which Android library variants to publish if this project has an Android target
+      // defaults to "release" when using the main plugin and nothing for the base plugin
+      configure(new KotlinMultiplatform(new JavadocJar.Dokka("dokkaHtml"), true, ["debug", "release"]))
     }
     ```
 
@@ -215,6 +217,11 @@ For projects using the `org.jetbrains.kotlin.multiplatform` plugin.
         // - `JavadocJar.Empty()` publish an emprt jar
         // - `JavadocJar.Dokka("dokkaHtml")` when using Kotlin with Dokka, where `dokkaHtml` is the name of the Dokka task that should be used as input
         javadocJar = JavadocJar.Dokka("dokkaHtml"),
+        // whether to publish a sources jar
+        sourcesJar = true,
+        // configure which Android library variants to publish if this project has an Android target
+        // defaults to "release" when using the main plugin and nothing for the base plugin
+        androidVariantsToPublish = listOf("debug", release"),
       ))
     }
     ```

plugin/src/integrationTest/kotlin/com/vanniktech/maven/publish/MavenPublishPluginPlatformTest.kt

@@ -462,6 +462,112 @@ class MavenPublishPluginPlatformTest {
     assertThat(androidReleaseResult).javadocJar().exists()
     assertThat(androidReleaseResult).javadocJar().isSigned()
 
+    val androidDebugResult = result.withArtifactIdSuffix("android-debug")
+    assertThat(androidDebugResult).outcome().succeeded()
+    assertThat(androidDebugResult).artifact("aar").doesNotExist()
+    assertThat(androidDebugResult).pom().doesNotExist()
+    assertThat(androidDebugResult).module().doesNotExist()
+    assertThat(androidDebugResult).sourcesJar().doesNotExist()
+    assertThat(androidDebugResult).javadocJar().doesNotExist()
+  }
+
+  @TestParameterInjectorTest
+  fun kotlinMultiplatformWithAndroidLibraryAndSpecifiedVariantsProject(
+    @TestParameter(valuesProvider = AgpVersionProvider::class) agpVersion: AgpVersion,
+    @TestParameter(valuesProvider = KotlinVersionProvider::class) kotlinVersion: KotlinVersion,
+  ) {
+    agpVersion.assumeSupportedJdkAndGradleVersion(gradleVersion)
+    kotlinVersion.assumeSupportedJdkAndGradleVersion(gradleVersion)
+
+    val project = kotlinMultiplatformWithAndroidLibraryAndSpecifiedVariantsProjectSpec(agpVersion, kotlinVersion)
+    val result = project.run(fixtures, testProjectDir, testOptions)
+
+    assertThat(result).outcome().succeeded()
+    assertThat(result).artifact("jar").exists()
+    assertThat(result).artifact("jar").isSigned()
+    assertThat(result).pom().exists()
+    assertThat(result).pom().isSigned()
+    assertThat(result).pom().matchesExpectedPom(
+      kotlinStdlibCommon(kotlinVersion).copy(scope = "runtime"),
+    )
+    assertThat(result).module().exists()
+    assertThat(result).module().isSigned()
+    assertThat(result).sourcesJar().exists()
+    assertThat(result).sourcesJar().isSigned()
+    assertThat(result).sourcesJar().containsSourceSetFiles("commonMain")
+    assertThat(result).javadocJar().exists()
+    assertThat(result).javadocJar().isSigned()
+
+    val jvmResult = result.withArtifactIdSuffix("jvm")
+    assertThat(jvmResult).outcome().succeeded()
+    assertThat(jvmResult).artifact("jar").exists()
+    assertThat(jvmResult).artifact("jar").isSigned()
+    assertThat(jvmResult).pom().exists()
+    assertThat(jvmResult).pom().isSigned()
+    assertThat(jvmResult).pom().matchesExpectedPom(
+      kotlinStdlibJdk(kotlinVersion),
+      kotlinStdlibCommon(kotlinVersion),
+    )
+    assertThat(jvmResult).module().exists()
+    assertThat(jvmResult).module().isSigned()
+    assertThat(jvmResult).sourcesJar().exists()
+    assertThat(jvmResult).sourcesJar().isSigned()
+    assertThat(jvmResult).sourcesJar().containsSourceSetFiles("commonMain", "jvmMain")
+    assertThat(jvmResult).javadocJar().exists()
+    assertThat(jvmResult).javadocJar().isSigned()
+
+    val linuxResult = result.withArtifactIdSuffix("linux")
+    assertThat(linuxResult).outcome().succeeded()
+    assertThat(linuxResult).artifact("klib").exists()
+    assertThat(linuxResult).artifact("klib").isSigned()
+    assertThat(linuxResult).pom().exists()
+    assertThat(linuxResult).pom().isSigned()
+    assertThat(linuxResult).pom().matchesExpectedPom(
+      "klib",
+      kotlinStdlibCommon(kotlinVersion),
+    )
+    assertThat(linuxResult).module().exists()
+    assertThat(linuxResult).module().isSigned()
+    assertThat(linuxResult).sourcesJar().exists()
+    assertThat(linuxResult).sourcesJar().isSigned()
+    assertThat(linuxResult).sourcesJar().containsSourceSetFiles("commonMain", "linuxMain")
+    assertThat(linuxResult).javadocJar().exists()
+    assertThat(linuxResult).javadocJar().isSigned()
+
+    val nodejsResult = result.withArtifactIdSuffix("nodejs")
+    assertThat(nodejsResult).outcome().succeeded()
+    assertThat(nodejsResult).artifact("klib").exists()
+    assertThat(nodejsResult).artifact("klib").isSigned()
+    assertThat(nodejsResult).pom().exists()
+    assertThat(nodejsResult).pom().isSigned()
+    assertThat(nodejsResult).pom().matchesExpectedPom("klib", kotlinStdlibJs(kotlinVersion), kotlinDomApi(kotlinVersion))
+    assertThat(nodejsResult).module().exists()
+    assertThat(nodejsResult).module().isSigned()
+    assertThat(nodejsResult).sourcesJar().exists()
+    assertThat(nodejsResult).sourcesJar().isSigned()
+    assertThat(nodejsResult).sourcesJar().containsSourceSetFiles("commonMain", "nodeJsMain")
+    assertThat(nodejsResult).javadocJar().exists()
+    assertThat(nodejsResult).javadocJar().isSigned()
+
+    val androidReleaseResult = result.withArtifactIdSuffix("android")
+    assertThat(androidReleaseResult).outcome().succeeded()
+    assertThat(androidReleaseResult).artifact("aar").exists()
+    assertThat(androidReleaseResult).artifact("aar").isSigned()
+    assertThat(androidReleaseResult).pom().exists()
+    assertThat(androidReleaseResult).pom().isSigned()
+    assertThat(androidReleaseResult).pom().matchesExpectedPom(
+      "aar",
+      kotlinStdlibJdk(kotlinVersion),
+      kotlinStdlibCommon(kotlinVersion),
+    )
+    assertThat(androidReleaseResult).module().exists()
+    assertThat(androidReleaseResult).module().isSigned()
+    assertThat(androidReleaseResult).sourcesJar().exists()
+    assertThat(androidReleaseResult).sourcesJar().isSigned()
+    assertThat(androidReleaseResult).sourcesJar().containsSourceSetFiles("commonMain", "androidMain", "androidRelease")
+    assertThat(androidReleaseResult).javadocJar().exists()
+    assertThat(androidReleaseResult).javadocJar().isSigned()
+
     val androidDebugResult = result.withArtifactIdSuffix("android-debug")
     assertThat(androidDebugResult).outcome().succeeded()
     assertThat(androidDebugResult).artifact("aar").exists()

plugin/src/integrationTest/kotlin/com/vanniktech/maven/publish/ProjectSpecs.kt

@@ -174,6 +174,8 @@ fun kotlinMultiplatformWithAndroidLibraryProjectSpec(agpVersion: AgpVersion, kot
       SourceFile("androidDebug", "kotlin", "com/vanniktech/maven/publish/test/ExpectedTestClass.kt"),
       SourceFile("androidRelease", "kotlin", "com/vanniktech/maven/publish/test/ExpectedTestClass.kt"),
     ),
+    // needs to explicitly specify release to match the main plugin default behavior
+    basePluginConfig = "configure(new KotlinMultiplatform(new JavadocJar.Empty(), true, [\"release\"]))",
     buildFileExtra = baseProject.buildFileExtra + """
 
         android {
@@ -187,9 +189,7 @@ fun kotlinMultiplatformWithAndroidLibraryProjectSpec(agpVersion: AgpVersion, kot
         }
 
         kotlin {
-          android {
-            publishLibraryVariants("release", "debug")
-          }
+          androidTarget {}
 
           jvmToolchain {
               languageVersion.set(JavaLanguageVersion.of("8"))
@@ -199,6 +199,24 @@ fun kotlinMultiplatformWithAndroidLibraryProjectSpec(agpVersion: AgpVersion, kot
   )
 }
 
+fun kotlinMultiplatformWithAndroidLibraryAndSpecifiedVariantsProjectSpec(
+  agpVersion: AgpVersion,
+  kotlinVersion: KotlinVersion,
+): ProjectSpec {
+  val baseProject = kotlinMultiplatformWithAndroidLibraryProjectSpec(agpVersion, kotlinVersion)
+  return baseProject.copy(
+    basePluginConfig = "configure(new KotlinMultiplatform(new JavadocJar.Empty()))",
+    buildFileExtra = baseProject.buildFileExtra + """
+
+        kotlin {
+          androidTarget {
+            publishLibraryVariants("release", "debug")
+          }
+        }
+    """.trimIndent(),
+  )
+}
+
 fun androidLibraryProjectSpec(version: AgpVersion) = ProjectSpec(
   plugins = listOf(
     androidLibraryPlugin.copy(version = version.value),

plugin/src/integrationTest/kotlin/com/vanniktech/maven/publish/Subjects.kt

@@ -114,6 +114,13 @@ open class ArtifactSubject internal constructor(
     }
   }
 
+  fun doesNotExist() {
+    if (artifact.exists()) {
+      val files = result.repo.toFile().walkTopDown().filter { it.isFile }.toList()
+      failWithActual(fact("expected not to exist", artifact), fact("but repo contained", files))
+    }
+  }
+
   fun isSigned() {
     val signedArtifact = artifact.resolveSibling("${artifact.name}.asc")
     if (!signedArtifact.exists()) {

plugin/src/main/kotlin/com/vanniktech/maven/publish/MavenPublishBaseExtension.kt

@@ -364,8 +364,17 @@ abstract class MavenPublishBaseExtension(
     }
 
     when {
-      project.plugins.hasPlugin("org.jetbrains.kotlin.multiplatform") ->
-        configure(KotlinMultiplatform(defaultJavaDocOption(plainJavadocSupported = false)))
+      project.plugins.hasPlugin("org.jetbrains.kotlin.multiplatform") -> {
+        val variant = project.findOptionalProperty("ANDROID_VARIANT_TO_PUBLISH") ?: "release"
+        configure(
+          KotlinMultiplatform(
+            javadocJar = defaultJavaDocOption(plainJavadocSupported = false),
+            sourcesJar = true,
+            androidVariantsToPublish = listOf(variant),
+            forceAndroidVariantsIfNotEmpty = false,
+          ),
+        )
+      }
       project.plugins.hasPlugin("com.android.library") -> {
         val variant = project.findOptionalProperty("ANDROID_VARIANT_TO_PUBLISH") ?: "release"
         configure(AndroidSingleVariantLibrary(variant))

plugin/src/main/kotlin/com/vanniktech/maven/publish/Platform.kt

@@ -18,6 +18,7 @@ import org.gradle.jvm.component.internal.DefaultJvmSoftwareComponent
 import org.gradle.jvm.tasks.Jar
 import org.gradle.util.GradleVersion
 import org.jetbrains.kotlin.gradle.dsl.KotlinMultiplatformExtension
+import org.jetbrains.kotlin.gradle.plugin.mpp.KotlinAndroidTarget
 
 /**
  * Represents a platform that the plugin supports to publish. For example [JavaLibrary], [AndroidMultiVariantLibrary] or
@@ -269,10 +270,18 @@ data class AndroidMultiVariantLibrary @JvmOverloads constructor(
  *
  * This does not include javadoc jars because there are no APIs for that available.
  */
-data class KotlinMultiplatform @JvmOverloads constructor(
-  override val javadocJar: JavadocJar = JavadocJar.Empty(),
-  override val sourcesJar: Boolean = true,
+data class KotlinMultiplatform internal constructor(
+  override val javadocJar: JavadocJar,
+  override val sourcesJar: Boolean,
+  val androidVariantsToPublish: List<String>,
+  val forceAndroidVariantsIfNotEmpty: Boolean,
 ) : Platform() {
+  @JvmOverloads constructor(
+    javadocJar: JavadocJar = JavadocJar.Empty(),
+    sourcesJar: Boolean = true,
+    androidVariantsToPublish: List<String> = emptyList(),
+  ) : this(javadocJar, sourcesJar, androidVariantsToPublish, forceAndroidVariantsIfNotEmpty = true)
+
   override fun configure(project: Project) {
     check(project.plugins.hasPlugin("org.jetbrains.kotlin.multiplatform")) {
       "Calling configure(KotlinMultiplatform(...)) requires the org.jetbrains.kotlin.multiplatform plugin to be applied"
@@ -286,6 +295,16 @@ data class KotlinMultiplatform @JvmOverloads constructor(
 
     project.extensions.configure(KotlinMultiplatformExtension::class.java) {
       it.withSourcesJar(sourcesJar)
+
+      if (androidVariantsToPublish.isNotEmpty()) {
+        it.targets.configureEach { target ->
+          if (target is KotlinAndroidTarget) {
+            if (forceAndroidVariantsIfNotEmpty || target.publishLibraryVariants.isNullOrEmpty()) {
+              target.publishLibraryVariants = androidVariantsToPublish
+            }
+          }
+        }
+      }
     }
   }
 }