Add support for Maven <scm>

See gh-1051

initializr-generator/src/main/java/io/spring/initializr/generator/buildsystem/maven/MavenBuild.java

@@ -39,6 +39,8 @@ public class MavenBuild extends Build {
 
 	private final MavenDistributionManagement.Builder distributionManagement = new MavenDistributionManagement.Builder();
 
+	private final Scm.Builder scm = new Scm.Builder();
+
 	public MavenBuild(BuildItemResolver buildItemResolver) {
 		super(buildItemResolver);
 	}
@@ -47,6 +49,14 @@ public class MavenBuild extends Build {
 		this(null);
 	}
 
+	public Scm.Builder scm() {
+		return this.scm;
+	}
+
+	public Scm getScm() {
+		return this.scm.build();
+	}
+
 	@Override
 	public MavenBuildSettings.Builder settings() {
 		return this.settings;

initializr-generator/src/main/java/io/spring/initializr/generator/buildsystem/maven/MavenBuildWriter.java

@@ -66,6 +66,7 @@ public class MavenBuildWriter {
 	 */
 	public void writeTo(IndentingWriter writer, MavenBuild build) {
 		MavenBuildSettings settings = build.getSettings();
+		Scm scm = build.getScm();
 		writeProject(writer, () -> {
 			writeParent(writer, build);
 			writeProjectCoordinates(writer, settings);
@@ -79,6 +80,7 @@ public class MavenBuildWriter {
 			writeBuild(writer, build);
 			writeRepositories(writer, build);
 			writeDistributionManagement(writer, build);
+			writeScm(writer, scm);
 		});
 	}
 
@@ -468,6 +470,17 @@ public class MavenBuildWriter {
 		}
 	}
 
+	private void writeScm(IndentingWriter writer, Scm scm) {
+		if (!scm.isEmpty()) {
+			writeElement(writer, "scm", () -> {
+				writeSingleElement(writer, "connection", scm.getConnection());
+				writeSingleElement(writer, "developerConnection", scm.getDeveloperConnection());
+				writeSingleElement(writer, "tag", scm.getTag());
+				writeSingleElement(writer, "url", scm.getUrl());
+			});
+		}
+	}
+
 	private void writeSingleElement(IndentingWriter writer, String name, String text) {
 		if (text != null) {
 			writer.print(String.format("<%s>", name));

initializr-generator/src/main/java/io/spring/initializr/generator/buildsystem/maven/Scm.java

@@ -0,0 +1,142 @@
+/*
+ * 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
+ *
+ *      https://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.maven;
+
+import java.util.Optional;
+
+/**
+ * Maven Scm.
+ *
+ * @author Joachim Pasquali
+ */
+public class Scm {
+
+	private final String connection;
+
+	private final String developerConnection;
+
+	private final String tag;
+
+	private final String url;
+
+	protected Scm(Builder builder) {
+		this.connection = builder.connection;
+		this.developerConnection = builder.developerConnection;
+		this.tag = builder.tag;
+		this.url = builder.url;
+	}
+
+	public boolean isEmpty() {
+		return this.connection == null && this.developerConnection == null && this.tag == null;
+	}
+
+	/**
+	 * Return the source control management system URL that describes the repository and
+	 * how to connect to the repository.
+	 * @return the source control management system URL
+	 */
+	public String getConnection() {
+		return this.connection;
+	}
+
+	/**
+	 *
+	 * Just like <code>connection</code>, but for developers, i.e. this scm connection
+	 * will not be read only.
+	 * @return the source control management system URL for developers
+	 */
+	public String getDeveloperConnection() {
+		return this.developerConnection;
+	}
+
+	/**
+	 * The tag of current code. By default, it's set to HEAD during development.
+	 * @return the tag of current code
+	 */
+	public String getTag() {
+		return Optional.ofNullable(this.tag).orElse("HEAD");
+	}
+
+	/**
+	 * The URL to the project's browsable SCM repository.
+	 * @return the URL to the project's browsable SCM repository
+	 */
+	public String getUrl() {
+		return this.url;
+	}
+
+	public static class Builder {
+
+		private String connection;
+
+		private String developerConnection;
+
+		private String tag;
+
+		private String url;
+
+		/**
+		 * Specify the source control management system URL that describes the repository
+		 * and how to connect to the repository.
+		 * @param connection the source control management system URL
+		 * @return this for method chaining
+		 */
+		public Builder connection(String connection) {
+			this.connection = connection;
+			return this;
+		}
+
+		/**
+		 * Specify the source control management system URL for developers that describes
+		 * the repository and how to connect to the repository.
+		 * @param developerConnection the source control management system URL for
+		 * developers
+		 * @return this for method chaining
+		 */
+		public Builder developerConnection(String developerConnection) {
+			this.developerConnection = developerConnection;
+			return this;
+		}
+
+		/**
+		 * Specify the tag of current code. By default, it's set to HEAD during
+		 * development.
+		 * @param tag the tag of current code
+		 * @return this for method chaining
+		 */
+		public Builder tag(String tag) {
+			this.tag = tag;
+			return this;
+		}
+
+		/**
+		 * Specify the URL to the project's browsable SCM repository.
+		 * @param url the URL to the project's browsable SCM repository
+		 * @return this for method chaining
+		 */
+		public Builder url(String url) {
+			this.url = url;
+			return this;
+		}
+
+		public Scm build() {
+			return new Scm(this);
+		}
+
+	}
+
+}

initializr-generator/src/test/java/io/spring/initializr/generator/buildsystem/maven/MavenBuildWriterTests.java

@@ -767,6 +767,20 @@ class MavenBuildWriterTests {
 		});
 	}
 
+	@Test
+	void pomWithScm() {
+		MavenBuild build = new MavenBuild();
+		build.scm().connection("connection").developerConnection("developerConnection").tag("tag").url("url");
+
+		generatePom(build, (pom) -> {
+			NodeAssert dependency = pom.nodeAtPath("/project/scm");
+			assertThat(dependency).textAtPath("connection").isEqualTo("connection");
+			assertThat(dependency).textAtPath("developerConnection").isEqualTo("developerConnection");
+			assertThat(dependency).textAtPath("tag").isEqualTo("tag");
+			assertThat(dependency).textAtPath("url").isEqualTo("url");
+		});
+	}
+
 	private void generatePom(MavenBuild mavenBuild, Consumer<NodeAssert> consumer) {
 		MavenBuildWriter writer = new MavenBuildWriter();
 		StringWriter out = new StringWriter();

initializr-generator/src/test/java/io/spring/initializr/generator/buildsystem/maven/ScmTest.java

@@ -0,0 +1,50 @@
+/*
+ * 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
+ *
+ *      https://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.maven;
+
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link Scm}
+ *
+ * @author Joachim Pasquali
+ */
+public class ScmTest {
+
+	@Test
+	void emptyTest() {
+		Scm scm = this.builder().build();
+		assertThat(scm.isEmpty()).isTrue();
+	}
+
+	@Test
+	void allElementsTest() {
+		Scm scm = this.builder().connection("connection").developerConnection("developerConnection").url("url")
+				.tag("tag").build();
+		assertThat(scm.getConnection()).isEqualTo("connection");
+		assertThat(scm.getDeveloperConnection()).isEqualTo("developerConnection");
+		assertThat(scm.getTag()).isEqualTo("tag");
+		assertThat(scm.getUrl()).isEqualTo("url");
+	}
+
+	private Scm.Builder builder() {
+		return new Scm.Builder();
+	}
+
+}