Remove dependency to Android Gradle Plugin in build scripts

gradle/publish.gradle

@@ -1,7 +1,7 @@
 
 project.description = "Generate Android version code and version name automatically from git tags, date,... ."
 project.group = "me.moallemi.gradle"
-project.version = "2.0.0"
+project.version = "2.0.1"
 
 project.ext {
     pluginId = 'me.moallemi.advanced-build-version'

src/main/kotlin/me/moallemi/gradle/advancedbuildversion/utils/CompatibilityManager.kt

@@ -24,12 +24,7 @@ import org.gradle.util.GradleVersion
 
 fun checkAndroidGradleVersion(project: Project) {
     val androidGradlePlugin = getAndroidPlugin(project)
-    if (androidGradlePlugin == null) {
-        throw IllegalStateException(
-            "The Android Gradle plugin not found. " +
-                "gradle-advanced-build-version only works with Android gradle library."
-        )
-    } else if (!checkAndroidVersion(androidGradlePlugin.version)) {
+    if (androidGradlePlugin != null && !checkAndroidVersion(androidGradlePlugin.version)) {
         throw GradleException("gradle-advanced-build-version does not support Android Gradle plugin ${androidGradlePlugin.version}")
     } else if (!project.plugins.hasPlugin("com.android.application")) {
         throw GradleException("gradle-advanced-build-version only works with android application modules")

src/test/kotlin/me/moallemi/gradle/advancedbuildversion/integration/AdvancedBuildVersionPluginSetUpIntegrationTest.kt

@@ -87,7 +87,7 @@ class AdvancedBuildVersionPluginSetUpIntegrationTest {
         }
         assertThat(
             exception.message,
-            containsString("gradle-advanced-build-version only works with Android gradle library.")
+            containsString("gradle-advanced-build-version only works with android application modules")
         )
     }
 
@@ -172,6 +172,49 @@ class AdvancedBuildVersionPluginSetUpIntegrationTest {
         assertThat(output.output, containsString("Applying Advanced Build Version Plugin"))
     }
 
+    @Test
+    fun `plugin works with android application plugin applied`() {
+        publishToLocalMaven()
+
+        File("src/test/test-data", "app").copyRecursively(testProjectRoot.root)
+
+        writeBuildGradle(
+            """
+                buildscript {
+                  repositories {
+                    google()
+                    jcenter()
+                    mavenLocal()
+                  }
+                }
+
+                plugins {
+                    id("com.android.application")
+                    id("$PLUGIN_ID")
+                }
+
+                android {
+                  compileSdkVersion 29
+                  buildToolsVersion "29.0.2"
+                  defaultConfig {
+                    applicationId "com.example.myapplication"
+                    minSdkVersion 14
+                    targetSdkVersion 22
+                    versionCode 1
+                    versionName "1.0"
+                  }
+                }
+                """.trimIndent()
+        )
+
+        val output = GradleRunner.create()
+            .withProjectDir(testProjectRoot.root)
+            .withPluginClasspath()
+            .withGradleVersion(CURRENT_GRADLE_VERSION)
+            .build()
+        assertThat(output.output, containsString("Applying Advanced Build Version Plugin"))
+    }
+
     @Test
     fun `build fails with unsupported android gradle plugin 3_1_0`() {
         publishToLocalMaven()

src/test/kotlin/me/moallemi/gradle/advancedbuildversion/utils/CompatibilityManagerKtTest.kt

@@ -48,12 +48,13 @@ class CompatibilityManagerKtTest {
             every { iterator().hasNext() } returns false
         }
 
-        val exception = assertThrows(IllegalStateException::class.java) {
+        every { project.plugins.hasPlugin(any<String>()) } returns false
+
+        val exception = assertThrows(GradleException::class.java) {
             checkAndroidGradleVersion(project)
         }
         assertEquals(
-            exception.message, "The Android Gradle plugin not found. " +
-                "gradle-advanced-build-version only works with Android gradle library."
+            exception.message, "gradle-advanced-build-version only works with android application modules"
         )
     }