Split out libraries into SPM packages (#298)

Sources/Secretive/Controllers/JustUpdatedChecker.swift

@@ -0,0 +1,34 @@
+import Foundation
+import Combine
+import AppKit
+
+protocol JustUpdatedCheckerProtocol: ObservableObject {
+    var justUpdated: Bool { get }
+}
+
+class JustUpdatedChecker: ObservableObject, JustUpdatedCheckerProtocol {
+
+    @Published var justUpdated: Bool = false
+
+    init() {
+        check()
+    }
+
+    func check() {
+        let lastBuild = UserDefaults.standard.object(forKey: Constants.previousVersionUserDefaultsKey) as? String ?? "None"
+        let currentBuild = Bundle.main.infoDictionary!["CFBundleShortVersionString"] as! String
+        UserDefaults.standard.set(currentBuild, forKey: Constants.previousVersionUserDefaultsKey)
+        justUpdated = lastBuild != currentBuild
+    }
+
+
+
+}
+
+extension JustUpdatedChecker {
+
+    enum Constants {
+        static let previousVersionUserDefaultsKey = "com.maxgoedjen.Secretive.lastBuild"
+    }
+
+}