Add deep linking to Mac app.

Mac/AppDelegate.swift

@@ -341,6 +341,11 @@ class AppDelegate: NSObject, NSApplicationDelegate, NSUserInterfaceValidations,
         completionHandler([.alert, .badge, .sound])
     }
 	
+    func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {
+		mainWindowController?.handle(response)
+		completionHandler()
+    }
+	
 	// MARK: Add Feed
 
 	func addFeed(_ urlString: String?, name: String? = nil, account: Account? = nil, folder: Folder? = nil) {

Mac/MainWindow/MainWindowController.swift

@@ -7,6 +7,7 @@
 //
 
 import AppKit
+import UserNotifications
 import Articles
 import Account
 import RSCore
@@ -112,6 +113,12 @@ class MainWindowController : NSWindowController, NSUserInterfaceValidations {
 		return sidebarViewController?.selectedObjects
 	}
 
+	func handle(_ response: UNNotificationResponse) {
+		let userInfo = response.notification.request.content.userInfo
+		sidebarViewController?.deepLinkRevealAndSelect(for: userInfo)
+		currentTimelineViewController?.goToDeepLink(for: userInfo)
+	}
+
 	// MARK: - Notifications
 
 //	func window(_ window: NSWindow, willEncodeRestorableState state: NSCoder) {

Mac/MainWindow/Sidebar/SidebarViewController.swift

@@ -319,6 +319,13 @@ protocol SidebarDelegate: class {
 		
 	}
 	
+	func deepLinkRevealAndSelect(for userInfo: [AnyHashable : Any]) {
+		guard let accountNode = findAccountNode(userInfo), let feedNode = findFeedNode(userInfo, beginningAt: accountNode) else {
+			return
+		}
+		revealAndSelectRepresentedObject(feedNode.representedObject)
+	}
+	
 }
 
 // MARK: - NSUserInterfaceValidations
@@ -468,6 +475,36 @@ private extension SidebarViewController {
 		return nil
 	}
 
+	func findAccountNode(_ userInfo: [AnyHashable : Any]?) -> Node? {
+		guard let accountID = userInfo?[DeepLinkKey.accountID.rawValue] as? String else {
+			return nil
+		}
+		
+		if let node = treeController.rootNode.descendantNode(where: { ($0.representedObject as? Account)?.accountID == accountID }) {
+			return node
+		}
+
+		guard let accountName = userInfo?[DeepLinkKey.accountName.rawValue] as? String else {
+			return nil
+		}
+
+		if let node = treeController.rootNode.descendantNode(where: { ($0.representedObject as? Account)?.name == accountName }) {
+			return node
+		}
+
+		return nil
+	}
+	
+	func findFeedNode(_ userInfo: [AnyHashable : Any]?, beginningAt startingNode: Node) -> Node? {
+		guard let feedID = userInfo?[DeepLinkKey.feedID.rawValue] as? String else {
+			return nil
+		}
+		if let node = startingNode.descendantNode(where: { ($0.representedObject as? Feed)?.feedID == feedID }) {
+			return node
+		}
+		return nil
+	}
+	
 	func configure(_ cell: SidebarCell, _ node: Node) {
 		cell.cellAppearance = sidebarCellAppearance
 		cell.name = nameFor(node)

Mac/MainWindow/Timeline/TimelineViewController.swift

@@ -387,6 +387,15 @@ final class TimelineViewController: NSViewController, UndoableCommandRunner, Unr
 
 	// MARK: - Navigation
 	
+	func goToDeepLink(for userInfo: [AnyHashable : Any]) {
+		guard let articleID = userInfo[DeepLinkKey.articleID.rawValue] as? String else { return }
+		guard let ix = articles.firstIndex(where: { $0.articleID == articleID }) else {	return }
+		
+		NSCursor.setHiddenUntilMouseMoves(true)
+		tableView.rs_selectRow(ix)
+		tableView.scrollTo(row: ix)
+	}
+	
 	func goToNextUnread() {
 		guard let ix = indexOfNextUnreadArticle() else {
 			return