package startup

// Pre-defined queues...
var (
	Logger    StartupQueue
	PostFlags StartupQueue
)

type StartupQueue struct {
	items  []func()
	hasRun bool
}

func (q *StartupQueue) Add(initFn ...func()) {
	if q.hasRun {
		panic("Added init function after startup")
	}
	for _, fn := range initFn {
		q.items = append(q.items, fn)
	}
}

func (q *StartupQueue) Run() {
	if q.hasRun {
		panic("Attempted to run init function twice")
	}
	q.hasRun = true
	for _, fn := range q.items {
		fn()
	}
}