Transitive clean task in Gradle

gistfile1.groovy

apply plugin: "base"

tasks.all { task ->
  task.ext.transitiveClean = { 
    tasks."clean${task.name.capitalize()}".dependsOn { 
      depsOf(task).flatten().collect { "clean${it.name.capitalize()}" }
    }
  }
}

def depsOf(Task task, allDeps = []) {
  def thisDeps = task.taskDependencies.getDependencies(task)
  allDeps.addAll(thisDeps)
  thisDeps.each {
    depsOf(it, allDeps)
  }
  allDeps
}

task a
task b
task c {
  dependsOn a,b
  transitiveClean()
}