fetch Implementation-Version from manifest

Author: reugn

pom.xml

@@ -43,9 +43,8 @@
                         <configuration>
                             <archive>
                                 <manifest>
-                                    <mainClass>
-                                        com.github.reugn.devtools.Main
-                                    </mainClass>
+                                    <mainClass>com.github.reugn.devtools.Main</mainClass>
+                                    <addDefaultImplementationEntries>true</addDefaultImplementationEntries>
                                 </manifest>
                             </archive>
                             <descriptorRefs>

src/main/java/com/github/reugn/devtools/controllers/MainController.java

@@ -10,12 +10,10 @@
 import javafx.scene.input.KeyCode;
 import javafx.scene.input.KeyEvent;
 import javafx.scene.layout.VBox;
-import org.apache.maven.model.Model;
-import org.apache.maven.model.io.xpp3.MavenXpp3Reader;
 
-import java.io.FileReader;
 import java.net.URL;
 import java.util.ResourceBundle;
+import java.util.jar.Manifest;
 
 public class MainController implements Initializable, Logger {
 
@@ -60,12 +58,17 @@ public void initialize(URL location, ResourceBundle resources) {
     }
 
     private String getVersion() {
+        String version;
         try {
-            MavenXpp3Reader reader = new MavenXpp3Reader();
-            Model model = reader.read(new FileReader("pom.xml"));
-            return model.getVersion();
+            Class clazz = this.getClass();
+            String classPath = clazz.getResource(clazz.getSimpleName() + ".class").toString();
+            String manifestPath = classPath.substring(0, classPath.lastIndexOf("!") + 1) +
+                    "/META-INF/MANIFEST.MF";
+            Manifest manifest = new Manifest(new URL(manifestPath).openStream());
+            version = manifest.getMainAttributes().getValue("Implementation-Version");
         } catch (Exception e) {
             return "NA";
         }
+        return version;
     }
 }