build-logic: rework implementation details of versioning plugin

Author: msfjarvis

build-logic/android-plugins/src/main/kotlin/dev/msfjarvis/aps/gradle/versioning/VersioningPlugin.kt

@@ -5,12 +5,17 @@
 
 package dev.msfjarvis.aps.gradle.versioning
 
+import com.android.build.api.variant.ApplicationAndroidComponentsExtension
+import com.android.build.api.variant.VariantOutputConfiguration
 import com.android.build.gradle.internal.plugins.AppPlugin
 import com.vdurmont.semver4j.Semver
 import java.util.Properties
+import java.util.concurrent.atomic.AtomicBoolean
 import org.gradle.api.Plugin
 import org.gradle.api.Project
+import org.gradle.kotlin.dsl.getByType
 import org.gradle.kotlin.dsl.register
+import org.gradle.kotlin.dsl.withType
 
 /**
  * A Gradle [Plugin] that takes a [Project] with the [AppPlugin] applied and dynamically sets the
@@ -23,10 +28,7 @@ class VersioningPlugin : Plugin<Project> {
 
   override fun apply(project: Project) {
     with(project) {
-      val appPlugin =
-        requireNotNull(plugins.findPlugin(AppPlugin::class.java)) {
-          "Plugin 'com.android.application' must be applied to use this plugin"
-        }
+      val androidAppPluginApplied = AtomicBoolean(false)
       val propFile = layout.projectDirectory.file(VERSIONING_PROP_FILE)
       require(propFile.asFile.exists()) {
         "A 'version.properties' file must exist in the project subdirectory to use this plugin"
@@ -41,29 +43,44 @@ class VersioningPlugin : Plugin<Project> {
         requireNotNull(versionProps.getProperty(VERSIONING_PROP_VERSION_CODE).toInt()) {
           "version.properties must contain a '$VERSIONING_PROP_VERSION_CODE' property"
         }
-      appPlugin.extension.defaultConfig.versionName = versionName
-      appPlugin.extension.defaultConfig.versionCode = versionCode
-      afterEvaluate {
-        val version = Semver(versionName)
-        tasks.register<VersioningTask>("clearPreRelease") {
-          semverString.set(version.withClearedSuffix().toString())
-          propertyFile.set(propFile)
-        }
-        tasks.register<VersioningTask>("bumpMajor") {
-          semverString.set(version.withIncMajor().withClearedSuffix().toString())
-          propertyFile.set(propFile)
+      project.plugins.withType<AppPlugin> {
+        androidAppPluginApplied.set(true)
+        extensions.getByType<ApplicationAndroidComponentsExtension>().onVariants { variant ->
+          val mainOutput =
+            variant.outputs.single { it.outputType == VariantOutputConfiguration.OutputType.SINGLE }
+          mainOutput.versionName.set(versionName)
+          mainOutput.versionCode.set(versionCode)
         }
-        tasks.register<VersioningTask>("bumpMinor") {
-          semverString.set(version.withIncMinor().withClearedSuffix().toString())
-          propertyFile.set(propFile)
-        }
-        tasks.register<VersioningTask>("bumpPatch") {
-          semverString.set(version.withIncPatch().withClearedSuffix().toString())
-          propertyFile.set(propFile)
-        }
-        tasks.register<VersioningTask>("bumpSnapshot") {
-          semverString.set(version.withIncMinor().withSuffix("SNAPSHOT").toString())
-          propertyFile.set(propFile)
+      }
+      val version = Semver(versionName)
+      tasks.register<VersioningTask>("clearPreRelease") {
+        description = "Remove the pre-release suffix from the version"
+        semverString.set(version.withClearedSuffix().toString())
+        propertyFile.set(propFile)
+      }
+      tasks.register<VersioningTask>("bumpMajor") {
+        description = "Increment the major version"
+        semverString.set(version.withIncMajor().withClearedSuffix().toString())
+        propertyFile.set(propFile)
+      }
+      tasks.register<VersioningTask>("bumpMinor") {
+        description = "Increment the minor version"
+        semverString.set(version.withIncMinor().withClearedSuffix().toString())
+        propertyFile.set(propFile)
+      }
+      tasks.register<VersioningTask>("bumpPatch") {
+        description = "Increment the patch version"
+        semverString.set(version.withIncPatch().withClearedSuffix().toString())
+        propertyFile.set(propFile)
+      }
+      tasks.register<VersioningTask>("bumpSnapshot") {
+        description = "Increment the minor version and add the `SNAPSHOT` suffix"
+        semverString.set(version.withIncMinor().withSuffix("SNAPSHOT").toString())
+        propertyFile.set(propFile)
+      }
+      afterEvaluate {
+        check(androidAppPluginApplied.get()) {
+          "Plugin 'com.android.application' must be applied to ${project.displayName} to use the Versioning Plugin"
         }
       }
     }

build-logic/android-plugins/src/main/kotlin/dev/msfjarvis/aps/gradle/versioning/VersioningTask.kt

@@ -39,6 +39,10 @@ abstract class VersioningTask : DefaultTask() {
     }
   }
 
+  override fun getGroup(): String {
+    return "versioning"
+  }
+
   @TaskAction
   fun execute() {
     propertyFile.get().asFile.writeText(Semver(semverString.get()).toPropFileText())