ant extract distversion from project_params

- don't hardcode distversion anymore
  - extract it from project_version= line of project_params

build.xml

@@ -12,7 +12,19 @@
   <property name="dist"  location="dist"/>
   <!-- Fill me please / todo -->
   <property name="artgraphicslib" value="artgaphics-0.2.0"/>
-  <property name="distversion" value="1.1"/>
+  <target name="gather_project_params">
+    <!-- original source parameter is in project_params project_version -->
+    <loadfile property="distversion" srcfile="${basedir}/project_params">
+      <filterchain>
+        <tokenfilter>
+          <containsregex
+              pattern="project_version=([0-9.]+)$"
+              replace="\1" />
+            </tokenfilter>
+      </filterchain>
+    </loadfile>
+    <echo message="distversion : ${distversion}" />
+  </target>
 
   <target name="init">
     <!-- Create the time stamp -->
@@ -30,7 +42,7 @@
     </javac>
   </target>
 
-  <target name="dist" depends="compile"
+  <target name="dist" depends="gather_project_params,compile"
         description="generate the distribution" >
     <!-- Create the distribution directory -->
     <mkdir dir="${dist}/lib"/>