feat: Add application lifecycle convenience publisher (#78)

Sources/Interact/Extensions/NSNotificationCenter.swift

@@ -0,0 +1,36 @@
+// Copyright (c) 2018-2023 InSeven Limited
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+import Combine
+import Foundation
+
+extension NotificationCenter {
+
+#if os(macOS)
+
+    public func applicationWillBecomeActive() -> AnyPublisher<Notification, Never> {
+        let name = NSNotification.Name("NSApplicationWillBecomeActiveNotification")
+        return publisher(for: name)
+            .eraseToAnyPublisher()
+    }
+
+#endif
+
+}