note.swift

#!/usr/bin/xcrun swift
import Cocoa
import ObjectiveC

// Pretend to be Finder
extension Bundle { var __bundleIdentifier: String? { return "com.apple.finder" } }
guard let bundleClass : AnyClass = NSClassFromString("NSBundle")
    else { fatalError("Unable to fetch NSBundle class") }
let id1 = class_getInstanceMethod(bundleClass, #selector(getter: Bundle.bundleIdentifier))
let id2 = class_getInstanceMethod(bundleClass, #selector(getter: Bundle.__bundleIdentifier))
method_exchangeImplementations(id1, id2)

// Fetch Command Line Arguments
var arguments = CommandLine.arguments
let appName = arguments.remove(at: 0)
guard !arguments.isEmpty else {
    print("Usage: \(appName) [-d|--delay delay] message")
    exit(-1)
}

// Find delay if used
var delay = 0.0
let dashedArguments: [String] = arguments.filter({ $0.hasPrefix("-") })
for argument in dashedArguments {
    guard var argumentIndex = arguments.index(of: argument) else { continue }
    if !["-d", "--delay"].contains(argument) { continue }

    // Fetch the time to delay
    let nextIndex = argumentIndex.advanced(by: 1)
    if nextIndex < arguments.endIndex {
        let value = arguments[nextIndex]
        if let delayValue = Double(value) {
            // Set delay
            delay = delayValue
            // Remove flag and value from message
            arguments.remove(at: nextIndex)
            arguments.remove(at: argumentIndex)
            // Stop looking for delay
            break
        }
    }
}

// Compose message
let message = arguments.joined(separator: " ")

// Post notification
let note: NSUserNotification = {
    $0.soundName = NSUserNotificationDefaultSoundName
    $0.hasActionButton = true
    $0.title = message
    $0.deliveryDate = Date(timeIntervalSinceNow: delay)
    return $0
}(NSUserNotification())
NSUserNotificationCenter.default.scheduleNotification(note)