Support for --version, fixes #2

pom.xml

@@ -80,6 +80,12 @@
     </dependencies>
 
     <build>
+        <resources>
+            <resource>
+                <directory>${basedir}/src/main/resources</directory>
+                <filtering>true</filtering>
+            </resource>
+        </resources>
         <plugins>
             <plugin>
                 <groupId>io.takari.maven.plugins</groupId>

src/main/java/org/jboss/fuse/mvnd/daemon/Client.java

@@ -15,17 +15,21 @@
  */
 package org.jboss.fuse.mvnd.daemon;
 
+import java.io.InputStream;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
+import java.util.Date;
 import java.util.LinkedHashMap;
 import java.util.List;
+import java.util.Properties;
 import java.util.UUID;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
+import org.apache.maven.cli.CLIReportingUtils;
 import org.jboss.fuse.mvnd.daemon.Message.BuildEvent;
 import org.jboss.fuse.mvnd.daemon.Message.BuildMessage;
 import org.jboss.fuse.mvnd.daemon.Message.MessageSerializer;
@@ -51,6 +55,24 @@ public class Client {
         LOGGER.debug("Starting client");
         List<String> args = new ArrayList<>(Arrays.asList(argv));
 
+        // Print version if needed
+        boolean version = args.remove("-v") || args.remove("--version");
+        boolean showVersion = args.contains("-V") || args.contains("--show-version");
+        boolean debug = args.contains("-X") || args.contains("--debug");
+        if (version || showVersion || debug) {
+            Properties props = new Properties();
+            try (InputStream is = Client.class.getResourceAsStream("build.properties")) {
+                props.load(is);
+            }
+            String v = buffer().strong( "Maven Daemon " + props.getProperty("version") ).toString()
+                    + System.getProperty( "line.separator" )
+                    + CLIReportingUtils.showVersion();
+            System.out.println(v);
+            if (version) {
+                return;
+            }
+        }
+
         Path javaHome = Layout.javaHome();
         DaemonRegistry registry = DaemonRegistry.getDefault();
 

src/main/resources/org/jboss/fuse/mvnd/daemon/build.properties

@@ -0,0 +1,23 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you 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.
+
+buildNumber=${buildNumber}
+timestamp=${timestamp}
+version=${project.version}
+distributionId=${distributionId}
+distributionShortName=${distributionShortName}
+distributionName=${distributionName}