Add R8 shrinker support, update gradle wrapper and android plugin

Author: creati8e

README.md

@@ -1,6 +1,6 @@
 Gradle Plugin that generates randomized dictionaries for proguard
 
-**Tested on latest (3.3) Android Gradle Plugin.**
+**Tested on latest (3.3.2) Android Gradle Plugin.**
 
 # How to add
 In your root project's `build.gradle`
@@ -10,7 +10,7 @@ buildscript {
     gradlePluginPortal()
 
     dependencies {
-        classpath "gradle.plugin.ru.cleverpumpkin.proguard-dictionaries-generator:plugin:1.0.1"
+        classpath "gradle.plugin.ru.cleverpumpkin.proguard-dictionaries-generator:plugin:1.0.2"
     }
 }
 ```
@@ -71,6 +71,11 @@ In your `proguard-rules.pro` file
 Plugin runs automatically when android plugin executes proguard task,
 so you don't need anything special to get it work.
 
+Also plugin supports R8, new code shrinker. If you'd apply it in 
+your gradle properties file
+(`android.enableR8=true` or `android.enableR8.fullMode=true`),
+the plugin will take it in account automatically. 
+
 White space, punctuation characters, duplicate words,
 and comments after a # sign are ignored in dictionaries by Proguard.
 So generated file could contains any symbols except above.

buildSrc/src/main/kotlin/Dependencies.kt

@@ -5,9 +5,9 @@ import Versions.projectVer
 
 object Versions {
     const val kotlinVer = "1.3.11"
-    const val projectVer = "1.0.1"
+    const val projectVer = "1.0.2"
     const val androidXVer = "1.0.0"
-    const val gradlePluginVer = "3.3.0"
+    const val gradlePluginVer = "3.3.2"
 }
 
 object BuildScriptPlugins {

gradle/wrapper/gradle-wrapper.properties

@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-5.1.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.3-all.zip

plugin/src/main/java/ru/cleverpumpkin/plugin/ProguardDictionaryGeneratorPlugin.kt

@@ -11,10 +11,13 @@ import org.gradle.api.Task
 class ProguardDictionaryGeneratorPlugin : Plugin<Project> {
 
     private companion object {
-        // Task on which we depends on.
+        // Tasks on which we depends on.
+        const val TARGET_R8_TASK = "transformClassesAndResourcesWithR8For"
         const val TARGET_PROGUARD_TASK = "transformClassesAndResourcesWithProguardFor"
 
         const val LOG_TAG = "ProguardDictionaryGenerator"
+
+        val PROP_R8 = listOf("android.enableR8", "android.enableR8.fullMode")
     }
 
     override fun apply(project: Project) {
@@ -33,10 +36,11 @@ class ProguardDictionaryGeneratorPlugin : Plugin<Project> {
     private fun Project.setupPlugin() {
         val pluginExtension = findPluginExtension()
 
-        val proguardTask = findProguardTransformTask()
+        val targetTaskName = getTargetTaskName()
+        val proguardTask = findTransformTask(targetTaskName)
         if (proguardTask == null) {
             logger.lifecycle(
-                "$LOG_TAG: proguard task ($TARGET_PROGUARD_TASK) not found"
+                "$LOG_TAG: proguard task ($targetTaskName) not found"
             )
             return
         }
@@ -59,8 +63,16 @@ class ProguardDictionaryGeneratorPlugin : Plugin<Project> {
         proguardTask.dependsOn(createGeneratorTask)
     }
 
-    private fun Project.findProguardTransformTask(): Task? {
-        return tasks.find { task -> task.name.startsWith(TARGET_PROGUARD_TASK) }
+    private fun Project.getTargetTaskName(): String {
+        return if (isR8Enabled()) TARGET_R8_TASK else TARGET_PROGUARD_TASK
+    }
+
+    private fun Project.isR8Enabled(): Boolean {
+        return properties.any { (key) -> key in PROP_R8 }
+    }
+
+    private fun Project.findTransformTask(taskName: String): Task? {
+        return tasks.find { task -> task.name.startsWith(taskName) }
     }
 
     private fun Project.findPluginExtension(): ProguardDictionaryPluginExtension {