Mac OSX Launcher: Adding the "launcher launcher" for startup functionality.

launchers/macosx/StartupItemApp/AppDelegate.swift

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+//
+//  AppDelegate.swift
+//  StartupItemApp
+//
+//  Created by Mikal Villa on 21/12/2018.
+//  Copyright © 2018 The I2P Project. All rights reserved.
+//
+
+import Cocoa
+
+extension Notification.Name {
+  static let killLauncher = Notification.Name("killStartupLauncher")
+}
+
+@NSApplicationMain
+class AppDelegate: NSObject {
+  
+  @objc func terminate() {
+    NSApp.terminate(nil)
+  }
+}
+
+extension AppDelegate: NSApplicationDelegate {
+  
+  func applicationDidFinishLaunching(_ aNotification: Notification) {
+    
+    let mainAppIdentifier = "net.i2p.bootstrap-macosx.I2PLauncher"
+    let runningApps = NSWorkspace.shared.runningApplications
+    let isRunning = !runningApps.filter { $0.bundleIdentifier == mainAppIdentifier }.isEmpty
+    
+    if !isRunning {
+      DistributedNotificationCenter.default().addObserver(self,
+                                                          selector: #selector(self.terminate),
+                                                          name: .killLauncher,
+                                                          object: mainAppIdentifier)
+      
+      let path = Bundle.main.bundlePath as NSString
+      var components = path.pathComponents
+      components.removeLast()
+      components.removeLast()
+      components.removeLast()
+      components.append("MacOS")
+      components.append("I2PLauncher") //main app name
+      
+      let newPath = NSString.path(withComponents: components)
+      
+      NSWorkspace.shared.launchApplication(newPath)
+    }
+    else {
+      self.terminate()
+    }
+  }
+}
+

launchers/macosx/StartupItemApp/Assets.xcassets/AppIcon.appiconset/Contents.json

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+{
+  "images" : [
+    {
+      "idiom" : "mac",
+      "size" : "16x16",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "mac",
+      "size" : "16x16",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "mac",
+      "size" : "32x32",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "mac",
+      "size" : "32x32",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "mac",
+      "size" : "128x128",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "mac",
+      "size" : "128x128",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "mac",
+      "size" : "256x256",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "mac",
+      "size" : "256x256",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "mac",
+      "size" : "512x512",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "mac",
+      "size" : "512x512",
+      "scale" : "2x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

launchers/macosx/StartupItemApp/Assets.xcassets/Contents.json

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+{
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

launchers/macosx/StartupItemApp/Info.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIconFile</key>
+	<string></string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+	<key>LSMinimumSystemVersion</key>
+	<string>$(MACOSX_DEPLOYMENT_TARGET)</string>
+	<key>NSHumanReadableCopyright</key>
+	<string>Copyright © 2018 The I2P Project. All rights reserved.</string>
+	<key>NSMainNibFile</key>
+	<string>MainMenu</string>
+	<key>NSPrincipalClass</key>
+	<string>NSApplication</string>
+	<key>LSBackgroundOnly</key>
+	<true/>
+</dict>
+</plist>

launchers/macosx/StartupItemApp/StartupItemApp.entitlements

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>com.apple.security.app-sandbox</key>
+	<true/>
+	<key>com.apple.security.application-groups</key>
+	<array>
+		<string>$(TeamIdentifierPrefix)</string>
+	</array>
+	<key>com.apple.security.files.user-selected.read-only</key>
+	<true/>
+</dict>
+</plist>