Add integration with Gradle Plugin Development Plugin

src/main/kotlin/io/github/sgtsilvio/gradle/metadata/MetadataPlugin.kt

@@ -10,6 +10,7 @@ import org.gradle.kotlin.dsl.configure
 import org.gradle.kotlin.dsl.create
 import org.gradle.kotlin.dsl.getByType
 import org.gradle.kotlin.dsl.withType
+import org.gradle.plugin.devel.GradlePluginDevelopmentExtension
 
 /**
  * @author Silvio Giebl
@@ -31,6 +32,9 @@ class MetadataPlugin : Plugin<Project> {
         project.plugins.withId("biz.aQute.bnd.builder") {
             setBndMetadata(project, metadata)
         }
+        project.plugins.withId("org.gradle.java-gradle-plugin") {
+            setGradlePluginMetadata(project, metadata)
+        }
     }
 
     private fun setPomMetadata(project: Project, metadata: MetadataExtensionImpl) {
@@ -101,6 +105,18 @@ class MetadataPlugin : Plugin<Project> {
             }
         }
     }
+
+    private fun setGradlePluginMetadata(project: Project, metadata: MetadataExtensionImpl) {
+        val gradlePluginExtension = project.extensions.getByType<GradlePluginDevelopmentExtension>()
+        gradlePluginExtension.website.convention(metadata.url)
+        gradlePluginExtension.vcsUrl.convention(metadata.scm.provider.flatMap { it.url })
+        project.afterEvaluate {
+            gradlePluginExtension.plugins.configureEach {
+                if (displayName == null) displayName = metadata.readableName.get()
+                if (description == null) description = metadata.description.get()
+            }
+        }
+    }
 }
 
 const val EXTENSION_NAME = "metadata"

src/test/kotlin/io/github/sgtsilvio/gradle/metadata/GradlePluginDevelopmentInteroperabilityTest.kt

@@ -0,0 +1,99 @@
+package io.github.sgtsilvio.gradle.metadata
+
+import org.gradle.testkit.runner.GradleRunner
+import org.gradle.testkit.runner.TaskOutcome
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.io.TempDir
+import java.io.File
+import java.util.Properties
+
+/**
+ * @author Silvio Giebl
+ */
+internal class GradlePluginDevelopmentInteroperabilityTest {
+
+    @Test
+    fun test(@TempDir projectDir: File) {
+        projectDir.resolve("settings.gradle.kts").writeText(
+            """
+            rootProject.name = "test"
+            """.trimIndent()
+        )
+        projectDir.resolve("build.gradle.kts").writeText(
+            """
+            import java.util.Properties
+            plugins {
+                `java-gradle-plugin`
+                id("io.github.sgtsilvio.gradle.metadata")
+            }
+            group = "com.example"
+            version = "1.2.3"
+            description = "Test is a generic gradle plugin provided by Example Org"
+            metadata {
+                readableName.set("Test")
+                url.set("www.example.com/test")
+                github {}
+            }
+            gradlePlugin {
+                plugins {
+                    create("test") {
+                        id = "com.example.test"
+                        implementationClass = "com.example.test.TestPlugin"
+                    }
+                    create("test2") {
+                        id = "com.example.test2"
+                        implementationClass = "com.example.test.Test2Plugin"
+                    }
+                    create("test3") {
+                        id = "com.example.test3"
+                        implementationClass = "com.example.test.Test3Plugin"
+                        displayName = "Test 3 (custom)"
+                        description = "Test 3 description (custom)"
+                    }
+                }
+            }
+            tasks.register("gradlePluginProperties") {
+                doLast {
+                    val properties = Properties()
+                    properties["website"] = gradlePlugin.website.get()
+                    properties["vcsUrl"] = gradlePlugin.vcsUrl.get()
+                    val testPlugin = gradlePlugin.plugins["test"]
+                    properties["plugins.test.displayName"] = testPlugin.displayName
+                    properties["plugins.test.description"] = testPlugin.description
+                    val test2Plugin = gradlePlugin.plugins["test2"]
+                    properties["plugins.test2.displayName"] = test2Plugin.displayName
+                    properties["plugins.test2.description"] = test2Plugin.description
+                    val test3Plugin = gradlePlugin.plugins["test3"]
+                    properties["plugins.test3.displayName"] = test3Plugin.displayName
+                    properties["plugins.test3.description"] = test3Plugin.description
+                    file("gradle-plugin.properties").outputStream().use {
+                        properties.store(it, null)
+                    }
+                }
+            }
+            """.trimIndent()
+        )
+
+        val result = GradleRunner.create()
+            .withProjectDir(projectDir)
+            .withPluginClasspath()
+            .withArguments("gradlePluginProperties")
+            .build()
+
+        assertEquals(TaskOutcome.SUCCESS, result.task(":gradlePluginProperties")?.outcome)
+
+        val properties = Properties()
+        projectDir.resolve("gradle-plugin.properties").inputStream().use {
+            properties.load(it)
+        }
+        assertEquals("www.example.com/test", properties["website"])
+        assertEquals("https://github.com/example/test.git", properties["vcsUrl"])
+        assertEquals("Test", properties["plugins.test.displayName"])
+        assertEquals("Test is a generic gradle plugin provided by Example Org", properties["plugins.test.description"])
+        assertEquals("Test", properties["plugins.test2.displayName"])
+        assertEquals("Test is a generic gradle plugin provided by Example Org", properties["plugins.test2.description"])
+        assertEquals("Test 3 (custom)", properties["plugins.test3.displayName"])
+        assertEquals("Test 3 description (custom)", properties["plugins.test3.description"])
+    }
+}