fixed #49 build version is commit id from git

.gitignore

@@ -34,3 +34,4 @@ www-test/
 
 /src/main/java/META-INF/persistence.xml
 /deps/
+/buildNumber.properties

pom.xml

@@ -36,6 +36,9 @@
 		<maven>3.2.1</maven>
 	</prerequisites>
 
+	<scm>
+		<connection>scm:git:https://github.com/billy1380/blogwt.git</connection>
+	</scm>
 	<build>
 		<outputDirectory>${project.build.directory}/${project.build.finalName}/WEB-INF/classes</outputDirectory>
 
@@ -46,6 +49,25 @@
 		</resources>
 
 		<plugins>
+			<plugin>
+				<groupId>org.codehaus.mojo</groupId>
+				<artifactId>buildnumber-maven-plugin</artifactId>
+				<version>1.4</version>
+				<executions>
+					<execution>
+						<phase>validate</phase>
+						<goals>
+							<goal>create</goal>
+						</goals>
+					</execution>
+				</executions>
+				<configuration>
+					<doCheck>true</doCheck>
+					<doUpdate>true</doUpdate>
+					<!-- <shortRevisionLength>5</shortRevisionLength> -->
+				</configuration>
+			</plugin>
+
 			<plugin>
 				<!-- Don't deploy gwt-dev jar to GAE -->
 				<artifactId>maven-clean-plugin</artifactId>
@@ -90,6 +112,22 @@
 				</configuration>
 			</plugin>
 
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-war-plugin</artifactId>
+				<version>2.0.2</version>
+				<configuration>
+					<archive>
+						<manifest>
+							<addDefaultImplementationEntries>true</addDefaultImplementationEntries>
+						</manifest>
+						<manifestEntries>
+							<Implementation-Build>${buildNumber}</Implementation-Build>
+						</manifestEntries>
+					</archive>
+				</configuration>
+			</plugin>
+
 			<plugin>
 				<groupId>org.codehaus.mojo</groupId>
 				<artifactId>versions-maven-plugin</artifactId>

src/main/java/com/willshex/blogwt/client/part/FooterPart.java

@@ -21,6 +21,7 @@
 import com.willshex.blogwt.client.Resources;
 import com.willshex.blogwt.client.controller.PropertyController;
 import com.willshex.blogwt.client.helper.ApiHelper;
+import com.willshex.blogwt.shared.helper.PropertyHelper;
 
 public class FooterPart extends Composite {
 
@@ -32,13 +33,13 @@ interface FooterPartUiBinder extends UiBinder<Widget, FooterPart> {}
 	public interface FooterTemplates extends SafeHtmlTemplates {
 		FooterTemplates FOOTER_TEMPLATES = GWT.create(FooterTemplates.class);
 
-		@Template("Copyright &copy; <a href=\"{0}\" class=\"{4}\" target=\"_blank\" rel=\"noopener\">{1}</a> {2}. All rights reserved - {3}.")
+		@Template("{5}Copyright &copy; <a href=\"{0}\" class=\"{4}\" target=\"_blank\" rel=\"noopener\">{1}</a> {2}. All rights reserved - {3}.")
 		SafeHtml copyrightNotice (SafeUri uri, String holder, String years,
-				String name, String styleNames);
+				String name, String styleNames, String version);
 
-		@Template("Copyright &copy; <a href=\"{0}\">{1}</a> {2}. All rights reserved - {3}.")
+		@Template("{4}Copyright &copy; <a href=\"{0}\">{1}</a> {2}. All rights reserved - {3}.")
 		SafeHtml copyrightNoticeInternal (SafeUri uri, String holder,
-				String years, String name);
+				String years, String name, String version);
 	}
 
 	@UiField DivElement divCopyright;
@@ -55,15 +56,23 @@ private FooterPart () {
 				|| urlAsString.startsWith("#")) {
 			divCopyright.setInnerSafeHtml(FooterTemplates.FOOTER_TEMPLATES
 					.copyrightNoticeInternal(url, controller.copyrightHolder(),
-							years(controller), controller.title()));
+							years(controller), controller.title(), version()));
 		} else {
 			divCopyright.setInnerSafeHtml(FooterTemplates.FOOTER_TEMPLATES
 					.copyrightNotice(url, controller.copyrightHolder(),
 							years(controller), controller.title(),
-							Resources.RES.styles().externalLink()));
+							Resources.RES.styles().externalLink(), version()));
 		}
 	}
 
+	private String version () {
+		return PropertyController.get()
+				.booleanProperty(PropertyHelper.FOOTER_SHOW_VERSION, false)
+						? (PropertyController.get()
+								.stringProperty(PropertyHelper.VERSION) + " - ")
+						: "";
+	}
+
 	@SuppressWarnings("deprecation")
 	private String years (PropertyController controller) {
 		Date started = controller.started();

src/main/java/com/willshex/blogwt/server/MainServlet.java

@@ -12,6 +12,10 @@
 import java.io.InputStreamReader;
 import java.util.List;
 import java.util.Map;
+import java.util.jar.Attributes;
+import java.util.jar.Manifest;
+import java.util.logging.Level;
+import java.util.logging.Logger;
 import java.util.stream.Collectors;
 
 import javax.servlet.ServletException;
@@ -49,6 +53,9 @@
 @WebServlet(name = "Site", urlPatterns = MainServlet.URL)
 public class MainServlet extends ContextAwareServlet {
 
+	private static final Logger LOG = Logger
+			.getLogger(MainServlet.class.getName());
+
 	public static final String URL = "/";
 
 	private static String PAGE_FORMAT = null;
@@ -224,12 +231,29 @@ private List<Property> appendProperties (StringBuffer scriptVariables) {
 		List<Property> properties = PropertyServiceProvider.provide()
 				.getProperties(0, 10000, null, null);
 
+		String build = null;
+		try {
+			Manifest m = new Manifest(getServletContext()
+					.getResourceAsStream("/META-INF/MANIFEST.MF"));
+			Attributes a = m.getMainAttributes();
+
+			build = a.getValue("Implementation-Build");
+		} catch (IOException | NullPointerException e) {
+			if (LOG.isLoggable(Level.FINE)) {
+				LOG.log(Level.FINE, "Could not retrieve version number", e);
+			}
+		}
+
+		final String version = build == null ? "none" : build;
+
+		properties.add(new Property().name(PropertyHelper.VERSION)
+				.type("string").value(version));
+
 		if (properties.size() >= 0) {
 			scriptVariables.append("var properties='[")
-					.append(String.join(", ", properties.stream()
-							.filter( (property) -> !PropertyHelper
-									.isSecretProperty(property))
-							.map( (property) -> jsonForJsVar(slim(property)))
+					.append(String.join(",", properties.stream()
+							.filter(p -> !PropertyHelper.isSecretProperty(p))
+							.map(p -> jsonForJsVar(slim(p)))
 							.collect(Collectors.toList())))
 					.append("]';");
 		}

src/main/java/com/willshex/blogwt/shared/helper/PropertyHelper.java

@@ -27,6 +27,8 @@ public class PropertyHelper {
 
 	public static final String PASSWORD_HASH_SALT = "setup.password.hash.salt";
 
+	public static final String VERSION = "system.version";
+
 	// functional properties
 	public static final String MARKDOWN_MAPS_API_KEY = "markdown.maps.api.key";
 	public static final String MARKDOWN_PREFETCH_INCLUDES = "markdown.include.prefectch";