feat(build-logic): introduce versioning plugin

build-logic/android-plugins/build.gradle.kts

@@ -42,10 +42,15 @@ gradlePlugin {
       id = "dev.msfjarvis.claw.rename-artifacts"
       implementationClass = "dev.msfjarvis.aps.gradle.RenameArtifactsPlugin"
     }
+    register("versioning") {
+      id = "dev.msfjarvis.claw.versioning-plugin"
+      implementationClass = "dev.msfjarvis.aps.gradle.versioning.VersioningPlugin"
+    }
   }
 }
 
 dependencies {
   implementation(libs.build.agp)
   implementation(libs.build.cachefix)
+  implementation(libs.build.semver)
 }

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

@@ -0,0 +1,9 @@
+package dev.msfjarvis.aps.gradle.versioning
+
+const val VERSIONING_PROP_FILE = "version.properties"
+const val VERSIONING_PROP_VERSION_NAME = "versioning-plugin.versionName"
+const val VERSIONING_PROP_VERSION_CODE = "versioning-plugin.versionCode"
+const val VERSIONING_PROP_COMMENT =
+  """#
+# This file was automatically generated by 'versioning-plugin'. DO NOT EDIT MANUALLY.
+#"""

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

@@ -0,0 +1,83 @@
+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
+ * versionCode and versionName properties based on values read from a [VERSIONING_PROP_FILE] file in
+ * the [Project.getBuildDir] directory. It also adds Gradle tasks to bump the major, minor, and
+ * patch versions along with one to prepare the next snapshot.
+ */
+@Suppress("Unused")
+class VersioningPlugin : Plugin<Project> {
+
+  override fun apply(project: Project) {
+    with(project) {
+      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"
+      }
+      val contents = providers.fileContents(propFile).asText
+      val versionProps = Properties().also { it.load(contents.get().byteInputStream()) }
+      val versionName =
+        requireNotNull(versionProps.getProperty(VERSIONING_PROP_VERSION_NAME)) {
+          "version.properties must contain a '$VERSIONING_PROP_VERSION_NAME' property"
+        }
+      val versionCode =
+        requireNotNull(versionProps.getProperty(VERSIONING_PROP_VERSION_CODE).toInt()) {
+          "version.properties must contain a '$VERSIONING_PROP_VERSION_CODE' property"
+        }
+      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)
+        }
+      }
+      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

@@ -0,0 +1,45 @@
+package dev.msfjarvis.aps.gradle.versioning
+
+import com.vdurmont.semver4j.Semver
+import org.gradle.api.DefaultTask
+import org.gradle.api.file.RegularFileProperty
+import org.gradle.api.provider.Property
+import org.gradle.api.tasks.CacheableTask
+import org.gradle.api.tasks.Input
+import org.gradle.api.tasks.OutputFile
+import org.gradle.api.tasks.TaskAction
+
+@CacheableTask
+abstract class VersioningTask : DefaultTask() {
+  @get:Input abstract val semverString: Property<String>
+
+  @get:OutputFile abstract val propertyFile: RegularFileProperty
+
+  /** Generate the Android 'versionCode' property */
+  private fun Semver.androidCode(): Int {
+    return major * 1_00_00 + minor * 1_00 + patch
+  }
+
+  private fun Semver.toPropFileText(): String {
+    val newVersionCode = androidCode()
+    val newVersionName = toString()
+    return buildString {
+      appendLine(VERSIONING_PROP_COMMENT)
+      append(VERSIONING_PROP_VERSION_CODE)
+      append('=')
+      appendLine(newVersionCode)
+      append(VERSIONING_PROP_VERSION_NAME)
+      append('=')
+      appendLine(newVersionName)
+    }
+  }
+
+  override fun getGroup(): String {
+    return "versioning"
+  }
+
+  @TaskAction
+  fun execute() {
+    propertyFile.get().asFile.writeText(Semver(semverString.get()).toPropFileText())
+  }
+}