Add javadoc generation target

Author: jody

build.xml

@@ -9,6 +9,7 @@
   <property name="build.dir"   value="build/classes"/>
   <property name="jar.dir"     value="build/jar"/>
   <property name="dist.dir"    value="dist"/>
+  <property name="docs.dir"    value="build/docs"/>
 
   <condition property="isMac">
     <os family="mac"/>
@@ -52,6 +53,16 @@
     <java jar="${jar.dir}/${app.name}.jar" fork="true"/>
   </target>
 
+  <target name="javadoc" description="Generate API documentation with Javadoc">
+    <mkdir dir="${docs.dir}"/>
+    <javadoc destdir="${docs.dir}"
+             sourcepath="${src.dir}"
+             packagenames="*"
+             use="true"
+             author="true"
+             version="true"/>
+  </target>
+
   <target name="package" description="Build the native installer for the current OS (DMG or DEB)">
     <antcall target="dmg"/>
     <antcall target="debian"/>