Small command-line macOS application using Swift

webkit.swift

#!/usr/bin/env xcrun swift

// Adapted from
// https://forums.developer.apple.com/thread/5137
// https://joearms.github.io/2016/01/04/fun-with-swift.html

import WebKit

class ApplicationDelegate: NSObject, NSApplicationDelegate {
    internal var window: NSWindow

    init(window: NSWindow) {
        self.window = window
    }

    func applicationDidFinishLaunching(_ notification: Notification) {
        let webView = WebView(frame: self.window.contentView!.frame)
        let search = "https://duckduckgo.com/?q=adrian+kosmaczewski"
        let url = URL(string: search)!
        let request = URLRequest(url: url)

        self.window.contentView?.addSubview(webView)
        webView.mainFrame.load(request)
    }
}

class WindowDelegate: NSObject, NSWindowDelegate {
    func windowWillClose(_ notification: Notification) {
        NSApplication.shared().terminate(0)
    }
}

let windowDelegate = WindowDelegate()
let window = NSWindow(contentRect: NSMakeRect(0, 0, 800, 600),
                      styleMask: [.titled, .closable, .miniaturizable],
                      backing: .buffered,
                      defer: false)
                      
window.center()
window.title = "Adrian Kosmaczewski"
window.delegate = windowDelegate
window.makeKeyAndOrderFront(window)

let applicationDelegate = ApplicationDelegate(window: window)

let application = NSApplication.shared()
application.setActivationPolicy(.regular)
application.delegate = applicationDelegate
application.activate(ignoringOtherApps: true)
application.run()