Added executable modular build options.

* Added a new property 'executable.jar'. When set to true, the build creates an
  executable jar. It expects the fully qualified main class name in the
  'main.class' property. The executable jar expects all the runtime libs to be
  located in a folder called 'lib' next to the jar.

jdb-build-1.8.xml

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
-<project name="Jonathan Bernard Build Common">
+<project name="Jonathan Bernard Build Common"
+    xmlns:ivy="antlib:org.apache.ivy.ant">
 
     <property environment="env"/>
 
@@ -16,6 +17,7 @@
         <property name="build.dir" value="${basedir}/build"/>
         <property name="lib.dir" value="${basedir}/lib"/>
         <property name="resources.dir" value="${basedir}/resources"/>
+        <property name="splash.image" value="splash.png"/>
 
         <!--======== PATHS ========-->
         <path id="groovy.classpath">
@@ -71,6 +73,12 @@
             conf="compile,runtime"/>
     </target>
 
+    <target name="-lib-groovy" if="${lib.local}">
+        <copy todir="${build.dir}/lib/runtime/jar">
+            <fileset dir="${env.GROOVY_HOME}/embeddable"/>
+        </copy>
+    </target>
+
     <target name="-lib-local" if="${lib.local}">
         <echo message="Resolving libraries locally."/>
         <mkdir dir="${build.dir}/lib/compile/jar"/>
@@ -104,7 +112,7 @@
     </target>
 
     <!--======== COMPILATION TARGETS ========-->
-    <target name="-compile-groovy" depends="-init,-init-groovy,lib">
+    <target name="-compile-groovy" depends="-init,-init-groovy,lib,-lib-groovy">
         <mkdir dir="${build.dir}/main/classes"/>
         <groovyc srcdir="${src.dir}/main" destdir="${build.dir}/main/classes"
             includeAntRuntime="false">
@@ -186,13 +194,42 @@
     </target>
 
     <!--======== BUILD TARGETS ========-->
-    <target name="-build-modular"
+    <target name="-build-modular-lib" unless="executable.jar"
         depends="compile,increment-build-number,resources">
 
         <jar destfile="${build.dir}/${name}-${version}.${build.number}.jar"
             basedir="${build.dir}/main/classes"/>
     </target>
 
+    <target name="-build-modular-executable" if="executable.jar"
+        depends="compile,increment-build-number,resources">
+
+        <pathconvert property="jar.classpath" pathsep=" " refid="runtime-libs">
+            <mapper>
+                <chainedmapper>
+                    <!-- remove absolute path -->
+                    <flattenmapper />
+
+                    <!-- add lib/ prefix -->
+                    <globmapper from="*" to="lib/*" />
+                </chainedmapper>
+            </mapper>
+        </pathconvert>
+
+        <jar destfile="${build.dir}/${name}-${version}.${build.number}.jar"
+            basedir="${build.dir}/main/classes">
+
+            <manifest>
+                <attribute name="Main-Class" value="${main.class}"/>
+                <attribute name="Class-Path" value="${jar.classpath}"/>
+                <attribute name="SplashScreen-Image" value="${splash.image}"/>
+            </manifest>
+        </jar>
+    </target>
+
+    <target name="-build-modular"
+        depends="-build-modular-lib,-build-modular-executable"/>
+
     <target name="-build-packed-libs"
         depends="compile,increment-build-number,resources">