Rework ExampleSubplugin for the new subplugins API

libraries/examples/kotlin-gradle-subplugin-example/src/main/kotlin/example/CompilerPlugin.kt

@@ -29,20 +29,23 @@ import com.intellij.mock.MockProject
 
 public object ExampleConfigurationKeys {
     public val EXAMPLE_KEY: CompilerConfigurationKey<String> = CompilerConfigurationKey.create<String>("example argument")
+    public val EXAMPLE_LEGACY_KEY: CompilerConfigurationKey<String> = CompilerConfigurationKey.create<String>("example legacy argument")
 }
 
 public class ExampleCommandLineProcessor : CommandLineProcessor {
     companion object {
         public val EXAMPLE_PLUGIN_ID: String = "example.plugin"
         public val EXAMPLE_OPTION: CliOption = CliOption("exampleKey", "<value>", "")
+        public val EXAMPLE_LEGACY_OPTION: CliOption = CliOption("exampleLegacyKey", "<value>", "")
     }
 
     override val pluginId: String = EXAMPLE_PLUGIN_ID
-    override val pluginOptions: Collection<CliOption> = listOf(EXAMPLE_OPTION)
+    override val pluginOptions: Collection<CliOption> = listOf(EXAMPLE_OPTION, EXAMPLE_LEGACY_OPTION)
 
     override fun processOption(option: CliOption, value: String, configuration: CompilerConfiguration) {
         when (option) {
             EXAMPLE_OPTION -> configuration.put(ExampleConfigurationKeys.EXAMPLE_KEY, value)
+            EXAMPLE_LEGACY_OPTION -> configuration.put(ExampleConfigurationKeys.EXAMPLE_LEGACY_KEY, value)
             else -> throw CliOptionProcessingException("Unknown option: ${option.name}")
         }
     }
@@ -51,7 +54,9 @@ public class ExampleCommandLineProcessor : CommandLineProcessor {
 public class ExampleComponentRegistrar : ComponentRegistrar {
     public override fun registerProjectComponents(project: MockProject, configuration: CompilerConfiguration) {
         val exampleValue = configuration.get(ExampleConfigurationKeys.EXAMPLE_KEY)
+        val exampleLegacyValue = configuration.get(ExampleConfigurationKeys.EXAMPLE_LEGACY_KEY)
         val messageCollector = configuration.get(CLIConfigurationKeys.MESSAGE_COLLECTOR_KEY, MessageCollector.NONE)
         messageCollector.report(CompilerMessageSeverity.INFO, "Project component registration: $exampleValue")
+        messageCollector.report(CompilerMessageSeverity.INFO, "Project component registration: $exampleLegacyValue")
     }
 }

libraries/examples/kotlin-gradle-subplugin-example/src/main/kotlin/example/ExampleLegacySubplugin.kt

@@ -0,0 +1,49 @@
+/*
+ * Copyright 2010-2015 JetBrains s.r.o.
+ *
+ * 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
+ *
+ * http://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 example
+
+import org.gradle.api.Project
+import org.gradle.api.tasks.compile.AbstractCompile
+import org.jetbrains.kotlin.gradle.plugin.*
+
+class ExampleLegacySubplugin : KotlinGradleSubplugin<AbstractCompile> {
+
+    override fun isApplicable(project: Project, task: AbstractCompile): Boolean {
+        return true
+    }
+
+    override fun apply(
+        project: Project,
+        kotlinCompile: AbstractCompile,
+        javaCompile: AbstractCompile?,
+        variantData: Any?,
+        androidProjectHandler: Any?,
+        kotlinCompilation: KotlinCompilation<*>?
+    ): List<SubpluginOption> {
+        println("ExampleLegacySubplugin loaded")
+        return listOf(
+            SubpluginOption("exampleLegacyKey", "exampleLegacyValue")
+        )
+    }
+
+    override fun getCompilerPluginId(): String {
+        return "example.plugin"
+    }
+
+    override fun getPluginArtifact(): SubpluginArtifact =
+        JetBrainsSubpluginArtifact("kotlin-gradle-subplugin-example")
+}

libraries/examples/kotlin-gradle-subplugin-example/src/main/kotlin/example/ExampleSubplugin.kt

@@ -16,26 +16,20 @@
 
 package example
 
-import org.gradle.api.Project
-import org.gradle.api.tasks.compile.AbstractCompile
+import org.gradle.api.provider.Provider
 import org.jetbrains.kotlin.gradle.plugin.*
 
-class ExampleSubplugin : KotlinGradleSubplugin<AbstractCompile> {
+class ExampleSubplugin : KotlinCompilerPluginSupportPlugin {
 
-    override fun isApplicable(project: Project, task: AbstractCompile): Boolean {
-        return true
-    }
+    override fun isApplicable(kotlinCompilation: KotlinCompilation<*>): Boolean = true
 
-    override fun apply(
-        project: Project,
-        kotlinCompile: AbstractCompile,
-        javaCompile: AbstractCompile?,
-        variantData: Any?,
-        androidProjectHandler: Any?,
-        kotlinCompilation: KotlinCompilation<*>?
-    ): List<SubpluginOption> {
+    override fun applyToCompilation(
+        kotlinCompilation: KotlinCompilation<*>
+    ): Provider<List<SubpluginOption>> {
         println("ExampleSubplugin loaded")
-        return listOf(SubpluginOption("exampleKey", "exampleValue"))
+        return kotlinCompilation.target.project.provider {
+            listOf(SubpluginOption("exampleKey", "exampleValue"))
+        }
     }
 
     override fun getCompilerPluginId(): String {

libraries/examples/kotlin-gradle-subplugin-example/src/main/resources/META-INF/gradle-plugins/kotlin-example-subplugin.properties

@@ -0,0 +1 @@
+implementation-class=example.ExampleSubplugin

libraries/examples/kotlin-gradle-subplugin-example/src/main/resources/META-INF/services/org.jetbrains.kotlin.gradle.plugin.KotlinGradleSubplugin

@@ -1 +1,6 @@
-example.ExampleSubplugin
+#
+# Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
+# Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+#
+
+example.ExampleLegacySubplugin

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/SubpluginsIT.kt

@@ -21,14 +21,18 @@ class SubpluginsIT : BaseGradleIT() {
         project.build("compileKotlin", "build") {
             assertSuccessful()
             assertContains("ExampleSubplugin loaded")
+            assertContains("ExampleLegacySubplugin loaded")
             assertContains("Project component registration: exampleValue")
+            assertContains("Project component registration: exampleLegacyValue")
             assertTasksExecuted(":compileKotlin")
         }
 
         project.build("compileKotlin", "build") {
             assertSuccessful()
             assertContains("ExampleSubplugin loaded")
+            assertContains("ExampleLegacySubplugin loaded")
             assertNotContains("Project component registration: exampleValue")
+            assertNotContains("Project component registration: exampleLegacyValue")
             assertTasksUpToDate(":compileKotlin")
         }
     }

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/kotlinGradleSubplugin/build.gradle

@@ -10,6 +10,7 @@ buildscript {
 }
 
 apply plugin: "kotlin"
+apply plugin: "kotlin-example-subplugin"
 
 repositories {
     mavenLocal()