add markers to gradle output so it's easy to extract the block for a failed task

init.gradle

/* 
  add markers to gradle output so it's easy to extract the block for a failed task,
  e.g. with a stream editor like sed.
*/

useLogger(new CustomEventLogger())

class CustomEventLogger implements TaskExecutionListener {
    public void beforeExecute(Task task) {
        println "## Start-task: $task.name"
    }

    public void afterExecute(Task task, TaskState state) {
        if (state.getFailure() != null) {
            println "## End-task-ERR: $task.name"
        } else {
            println "## End-task-OK: $task.name"
        }
        println()
    }
}