Add GradleKts build system

This commit adds a BuildSystem implementation for the Gradle Kotlin DSL

See gh-851

initializr-generator/src/main/java/io/spring/initializr/generator/buildsystem/gradle/GradleBuildSystem.java

@@ -19,7 +19,8 @@ package io.spring.initializr.generator.buildsystem.gradle;
 import io.spring.initializr.generator.buildsystem.BuildSystem;
 
 /**
- * Gradle {@link BuildSystem}.
+ * Gradle {@link BuildSystem} using the Groovy DSL (i.e. settings.gradle and
+ * build.gradle).
  *
  * @author Andy Wilkinson
  */

initializr-generator/src/main/java/io/spring/initializr/generator/buildsystem/gradle/GradleKtsBuildSystem.java

@@ -0,0 +1,44 @@
+/*
+ * Copyright 2012-2019 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.spring.initializr.generator.buildsystem.gradle;
+
+import io.spring.initializr.generator.buildsystem.BuildSystem;
+
+/**
+ * Gradle {@link BuildSystem} using the Kotlin DSL (i.e. settings.gradle.kts and
+ * build.gradle.kts).
+ *
+ * @author Jean-Baptiste Nizet
+ */
+public final class GradleKtsBuildSystem implements BuildSystem {
+
+	/**
+	 * Gradle KTS {@link BuildSystem} identifier.
+	 */
+	public static final String ID = "gradle-kts";
+
+	@Override
+	public String id() {
+		return ID;
+	}
+
+	@Override
+	public String toString() {
+		return id();
+	}
+
+}

initializr-generator/src/main/java/io/spring/initializr/generator/buildsystem/gradle/GradleKtsBuildSystemFactory.java

@@ -0,0 +1,37 @@
+/*
+ * Copyright 2012-2019 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.spring.initializr.generator.buildsystem.gradle;
+
+import io.spring.initializr.generator.buildsystem.BuildSystem;
+import io.spring.initializr.generator.buildsystem.BuildSystemFactory;
+
+/**
+ * {@link BuildSystemFactory Factory} for {@link GradleKtsBuildSystem}.
+ *
+ * @author Jean-Baptiste Nizet
+ */
+class GradleKtsBuildSystemFactory implements BuildSystemFactory {
+
+	@Override
+	public BuildSystem createBuildSystem(String id) {
+		if (GradleKtsBuildSystem.ID.equals(id)) {
+			return new GradleKtsBuildSystem();
+		}
+		return null;
+	}
+
+}

initializr-generator/src/main/resources/META-INF/spring.factories

@@ -1,5 +1,6 @@
 io.spring.initializr.generator.buildsystem.BuildSystemFactory=\
 io.spring.initializr.generator.buildsystem.gradle.GradleBuildSystemFactory,\
+io.spring.initializr.generator.buildsystem.gradle.GradleKtsBuildSystemFactory,\
 io.spring.initializr.generator.buildsystem.maven.MavenBuildSystemFactory
 
 io.spring.initializr.generator.language.LanguageFactory=\