settings.gradle

rootProject.name = 'how-to-gradle-project-variations'

// define versions of javax.servlet:servlet-api for which to generate variations of the app
def variations = ['2.3', '2.4', '2.5']

def projects = variations.collect { "${rootProject.name}-${it}" }

// include the app subproject with the servlet definitions
include('app')
// include a subproject for each variation of the servlet-api
include(*projects)

// create a subproject directory in directory "variations" for each variation
projects.findAll({ it != 'app' }).collect({ project(":${it}") }).forEach {
  // extract variation encoded in the project name
  def variation = it.name.substring(rootProject.name.length() + 1)
  // group these subprojects in the "variations" directory
  def dir = new File("variations/${variation}")
  // make sure the subproject directory exists
  assert !dir.isFile()
  if (!dir.exists()) {
    assert dir.mkdirs()
  }
  // at this time, we could generate files and properties in the subproject directory
  // set the project's directory
  it.projectDir = dir
}