Create default directory layout for an empty project.

init.gradle

// $ gradle initLayout
// $ gradle initLayout -PapplyPlugins=java,groovy

projectsEvaluated {
  rootProject.allprojects {
    tasks.withType(Compile) {
      options.compilerArgs << "-Xlint:unchecked"
    }
    
    if (!tasks.findByName('initLayout')) {
      task initLayout(description : 'Create default directory layout') << {
        if (project.hasProperty('applyPlugins')) {
          applyPlugins.split(',').each { applyPlugin ->
            project.apply {  
              plugin(applyPlugin.trim())
            }
          }
        }
        
        sourceSets*.allSource*.srcDirs.flatten().each { dir ->
          println "Create directory $dir"
          dir.mkdirs()
        }
      }   
    }   
  }
}