Scala, Ant

An example of building Scala applications using Ant and the Scala Ant tasks:

In the complete Ant build file given below, the key lines are:

<taskdef resource="scala/tools/ant/antlib.xml">
       <classpath>
           <pathelement location="${scala.home}/lib/scala-compiler.jar" />
           <pathelement location="${scala-library.jar}" />
       </classpath>
</taskdef>

Which loads the task definition

scala-library.jar defines Scala tasks for Ant, these are:

• scalac
• fsc
• scaladoc

Note: The Scala library scala-library.jar must be present in the Java class path. The actors and dbc libraries are available as separate JAR files: scala-actors.jarand scala-dbc.jar.


Example build.xml

// LJB 28-12-2008 - basic scala Ant build
<project name="Scala test" default="build" basedir="../">

<property name="base.dir" value="${basedir}" />
<property name="sources.dir" value="${base.dir}/src" />
<property name="build.dir" value="${base.dir}/build//classes.tmp" />

// take scala ant libs from scala installation, assumes SCALA_HOME is set to home of scala in env vars
<property environment="env"/>
<property name="scala.home" value="${env.SCALA_HOME}" />

<target name="init">

  <property name="scala-library.jar" value="${scala.home}/lib/scala-library.jar" />

  <path id="build.classpath">
        <pathelement location="${scala-library.jar}" />
        <!--<pathelement location="${your.path}" />-->
        <pathelement location="${build.dir}"   />
  </path>

  <taskdef resource="scala/tools/ant/antlib.xml">
      <classpath>
          <pathelement location="${scala.home}/lib/scala-compiler.jar" />
          <pathelement location="${scala-library.jar}" />
      </classpath>
  </taskdef>
</target>

<target name="build" depends="init">

  <mkdir dir="${build.dir}"   />

  <scalac srcdir="${sources.dir}"
        destdir="${build.dir}"
        classpathref="build.classpath"
        force="changed">

      <!-- <src location="src" /> -->
      <include name="**/*.scala" />
  </scalac>
</target>

<target name="run" depends="build">
  <java classname="test.Test"
      classpathref="build.classpath">
  </java>
</target>
</project>

Project directory structure:

/build
/build/build.xml
/src
/src/test.scala


Example "hello world" Scala test program

package test

object Test {

def main(args : Array[String]) {

println("Hello world")
}
}

If you type ant run in the /build directory, the application is compiled and run, giving "Hello world"...


References:

http://www.scala-lang.org/node/98


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