Additional OptionsWatcher interface. Didn't actually attempt to use, just an idea.

fsnotify-additions.go

type FileNotification interface {
	IsCreate() bool
	IsDelete() bool
	IsModify() bool
	IsRename() bool
	Path() string // relative path to the file
}

type OptionWatcher interface {
	Close() error
	RemoveWatch(string) error
	WatchPath(string, *Options) error
	NextNotification() (FileNotification, error)
}

func NewOptionWatcher() (OptionWatcher, error) {
	return NewWatcher()
}

func (w *Watcher) NextNotification() (fn FileNotification, err error) {
	select {
	case fn = <-w.internalEvent:
	case err = <-w.Error:
	}
	return
}

@howeyc One of my concerns is what happens when multiple watches have overlapping options, like a recursive watch on a subfolder with a different pattern match?

I'm wondering about the ability to watch multiple paths in a single watcher? Do we really need that. And if so, should some or all of the options be part of NewOptionWatcher() instead?

What would the calling code for Next() look like?

Lots of iterator options http://ewencp.org/blog/golang-iterators/