applicationDidFinishLaunching not invoked on Console App - macos

Question

I'm trying to write a simple command line app that can display some info on a notification. But, the Delegate is not being called, and neither is the Notification and I'm not sure what's missing here.
Judging from my output, I think the whole problem stems from the AppDelegate not being instantiated. But I am creating one just before I show call showNotification.
What am I missing here?
src/main.swift
import Foundation
import AppKit
var sema = DispatchSemaphore( value: 0 )
let server: String = "http://jsonip.com"
let port: String = "80"
let path: String = "/"
let todoEndpoint: String = server + ":" + port + path
let config = URLSessionConfiguration.default
let session = URLSession(configuration: config)
let url = URL(string: todoEndpoint)!
let task = session.dataTask(with: url, completionHandler: {
(data, response, error) in
if error != nil {
print(error!.localizedDescription)
} else {
do {
if let json = try JSONSerialization.jsonObject(with: data!, options: .allowFragments) as? [String: Any]
{
print(json)
let ad = AppDelegate()
ad.showNotification(title: "Title", subtitle: "SubTitle", informativeText: String(describing: json))
sema.signal()
}
} catch {
print("error in JSONSerialization")
}
}
})
print("Resume Task")
task.resume()
print("Wait for Semaphore")
sema.wait()
src/AppDelegate.swift
import Cocoa
class AppDelegate: NSObject, NSApplicationDelegate, NSUserNotificationCenterDelegate {
func applicationDidFinishLaunching(aNotification: Notification) {
NSUserNotificationCenter.default.delegate = self
print("Delegate Self")
}
// NSUserNotificationCenterDelegate implementation
private func userNotificationCenter(center: NSUserNotificationCenter!, didDeliverNotification notification: NSUserNotification!) {
//implementation
}
private func userNotificationCenter(center: NSUserNotificationCenter!, didActivateNotification notification: NSUserNotification!) {
//implementation
}
private func userNotificationCenter(center: NSUserNotificationCenter!, shouldPresentNotification notification: NSUserNotification!) -> Bool {
//implementation
return true
}
func showNotification(title: String, subtitle: String, informativeText: String) -> Void {
let notification: NSUserNotification = NSUserNotification()
print("Show Notification")
notification.title = title
notification.subtitle = subtitle
notification.informativeText = informativeText
//notification.contentImage = contentImage
notification.soundName = NSUserNotificationDefaultSoundName
NSUserNotificationCenter.default.deliver(notification)
print(notification.isPresented)
}
}
Output
Resume Task
Wait for Semaphore
["about": /about, "reject-fascism":
Impeach Trump!, "ip": 110.50.73.141, "Pro!": http://getjsonip.com]
Show Notification
false
Program ended with exit code: 0