monitor

type FileMonitor struct {
	// log
	Log zerolog.Logger
	// list of subscribers and their states
	Subsciptions []Subscription
}

type FileMonitorOptions struct {
	// Directory that should be monitored for change
	Path string
	// File extension
	Extension string
}

type Subscriber interface {
	GetOptions() FileMonitorOptions
	OnError(err error)
	OnNotify()
}

type Subscription struct {
	Entity       Subscriber
	Options      FileMonitorOptions
	LastModified time.Time
	NumFiles     int
}