Waaatcher

File Watcher Wrapper for macOS

Demo

FileSystemEvent

How to use

Start

let watcher = Waaatcher(paths: [path1, path2, path3])

// ...
watcher.watcherEventCallback = { events in
    print("Events: \(events)")
}

watcher.start()

Stop

watcher.stop()
// or watcher = nil

Each event is a structure which contains three parts as below

struct WaaaFSEvent {
    let path: String
    let flags: WaaaFSEventFlags
    let ID: FSEventStreamEventId
}

Also, WaaaFSEventFlags is defined as the wrapper of unreadable FSEventStreamEventFlags.

Reactive Extension

v1.0 extend Waaatcher with Reactive extension. Dead-simple API as below, Not like the Waaatcher native callback with event array parameter, rx extension emit each single event.

fileprivate let bag = DisposeBag()
// ...
let watcher = Waaatcher(paths: [path])
watcher?.rx.FSEventObservable.subscribe(onNext: { [weak self] in
    self?.output("Event: \($0)")
}).disposed(by: bag)

References

1. Using the FSEventsFramework
2. Apple FSEvents