gradle snippet: sources and javadoc jars for every subproject

sources_javadoc.gradle

/* Add this to the parent "build.gradle" to enable xyz-sources.jar and xyz-javadoc.jar generation
 * for every java and groovy subproject of the given parent project.
 * The script tolerates non-java subprojects.
 */
subprojects {

  afterEvaluate { 
    if(tasks.findByName("classes")) {
      task sourcesJar(type: Jar, dependsOn: classes) {
        classifier = 'sources'
        from sourceSets.main.allSource
      }
      artifacts {
        archives sourcesJar
      }
    }

    if(tasks.findByName("javadoc")) {
      task javadocJar(type: Jar) {
        dependsOn javadoc
        classifier = 'javadoc'
        from javadoc.destinationDir
        if(tasks.findByName("groovydoc")) {
          dependsOn groovydoc
          from groovydoc.destinationDir          
        }
      }
      artifacts {
        archives javadocJar
      }
    }
  }
}