Resolve "Create script to include commit in version string"

Closes #20 (closed)

src/main/java/org/jastadd/relast/compiler/Compiler.java

@@ -8,14 +8,11 @@ import org.jastadd.relast.parser.RelAstParser;
 import org.jastadd.relast.scanner.RelAstScanner;
 
 import java.io.*;
-import java.util.ArrayList;
-import java.util.Arrays;
+import java.util.*;
 import java.util.List;
 
 public class Compiler {
 
-  private static final String VERSION = "0.2.4";
-
   private ArrayList<Option<?>> options;
   private FlagOption optionWriteToFile;
   private FlagOption optionPrintAST;
@@ -35,7 +32,7 @@ public class Compiler {
     commandLine = new CommandLine(options);
     commandLine.parse(args);
 
-    printMessage("Running RelAST " + VERSION);
+    printMessage("Running RelAST " + readVersion());
 
     if (commandLine.getArguments().size() < 1) {
       error("specify at least one input file");
@@ -126,6 +123,26 @@ public class Compiler {
     }
   }
 
+  /**
+   * Reads the version string.
+   *
+   * The version string is read from the property file
+   * src/main/resources/Version.properties. This
+   * file should be generated during the build process. If it is missing
+   * then there is some problem in the build script.
+   *
+   * @author Jesper Öqvist <jesper.oqvist@cs.lth.se>
+   * @return the read version string, or <code>version ?</code>
+   */
+  private String readVersion() {
+    try {
+      ResourceBundle resources = ResourceBundle.getBundle("Version");
+      return resources.getString("version");
+    } catch (MissingResourceException e) {
+      return "version ?";
+    }
+  }
+
   public static void main(String[] args) {
     try {
       new Compiler(args);