A minimal Gradle buildfile for running a DITA-OT transformation

build.gradle

defaultTasks 'ditaOt'

def ditaHome = System.env.DITA_HOME
def antHome = System.env.ANT_HOME

task ditaOt << {
  ant.java(classname: "org.apache.tools.ant.launch.Launcher", fork: "true", failonerror: "true") {
    ant.jvmarg(value: "-Dant.library.dir=${antHome}/lib")

    ant.classpath {
      ant.pathelement(location: "${antHome}/lib/ant-launcher.jar")
    }

    ant.arg(line: "-lib ${ditaHome}")
    ant.arg(line: "-lib ${ditaHome}/lib")
    // For DITA-OT < 2.0
    ant.arg(line: "-lib ${ditaHome}/lib/saxon")
    // For DITA-OT < 1.6
    ant.arg(line: "-lib ${ditaHome}/demo/fo/fop/lib")
    ant.arg(line: "-buildfile ${ditaHome}/build.xml")

    // Properties passed to DITA-OT transformation
    ant.sysproperty(key: "transtype", value: "xhtml")
    ant.sysproperty(key: "args.input", value: "${inputFile}")
  }
}