Use delay to gather files

openFilesDelay.swift

var rawFilenames = [String]()
// instance counter
var timer:NSTimer! = nil

func application(sender: NSApplication, openFiles filenames: [String]) {
    if shouldQuitAppAfterConvert == nil {
        shouldQuitAppAfterConvert = true
    }
    if timer != nil {
        timer.invalidate()
    }
    self.rawFilenames += filenames
    timer = NSTimer.scheduledTimerWithTimeInterval(0.1, target: self, selector: #selector(prepareConvert), userInfo: nil, repeats: false)
}

func prepareConvert() {
    // do something
}