Create PseudoFeed.swift. This will be used for Today, All Unread, Starred, etc.

Evergreen.xcodeproj/project.pbxproj

@@ -13,6 +13,7 @@
 		842E45E51ED8C6B7000A8B52 /* MainWindowSplitView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 842E45E41ED8C6B7000A8B52 /* MainWindowSplitView.swift */; };
 		842E45E71ED8C747000A8B52 /* DB5.plist in Resources */ = {isa = PBXBuildFile; fileRef = 842E45E61ED8C747000A8B52 /* DB5.plist */; };
 		84513F901FAA63950023A1A9 /* FeedListControlsView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 84513F8F1FAA63950023A1A9 /* FeedListControlsView.swift */; };
+		845B14921FC2028A0013CF92 /* PseudoFeed.swift in Sources */ = {isa = PBXBuildFile; fileRef = 845B14911FC2028A0013CF92 /* PseudoFeed.swift */; };
 		845F52ED1FB2B9FC00C10BF0 /* FeedPasteboardWriter.swift in Sources */ = {isa = PBXBuildFile; fileRef = 845F52EC1FB2B9FC00C10BF0 /* FeedPasteboardWriter.swift */; };
 		846E773D1F6EF67A00A165E2 /* Account.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 846E773A1F6EF5D700A165E2 /* Account.framework */; };
 		846E773E1F6EF67A00A165E2 /* Account.framework in Embed Frameworks */ = {isa = PBXBuildFile; fileRef = 846E773A1F6EF5D700A165E2 /* Account.framework */; settings = {ATTRIBUTES = (CodeSignOnCopy, RemoveHeadersOnCopy, ); }; };
@@ -396,6 +397,7 @@
 		842E45E41ED8C6B7000A8B52 /* MainWindowSplitView.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = MainWindowSplitView.swift; sourceTree = "<group>"; };
 		842E45E61ED8C747000A8B52 /* DB5.plist */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.plist.xml; name = DB5.plist; path = Evergreen/Resources/DB5.plist; sourceTree = "<group>"; };
 		84513F8F1FAA63950023A1A9 /* FeedListControlsView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FeedListControlsView.swift; sourceTree = "<group>"; };
+		845B14911FC2028A0013CF92 /* PseudoFeed.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = PseudoFeed.swift; sourceTree = "<group>"; };
 		845F52EC1FB2B9FC00C10BF0 /* FeedPasteboardWriter.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FeedPasteboardWriter.swift; sourceTree = "<group>"; };
 		846E77161F6EF5D000A165E2 /* Database.xcodeproj */ = {isa = PBXFileReference; lastKnownFileType = "wrapper.pb-project"; name = Database.xcodeproj; path = Frameworks/Database/Database.xcodeproj; sourceTree = "<group>"; };
 		846E77301F6EF5D600A165E2 /* Account.xcodeproj */ = {isa = PBXFileReference; lastKnownFileType = "wrapper.pb-project"; name = Account.xcodeproj; path = Frameworks/Account/Account.xcodeproj; sourceTree = "<group>"; };
@@ -587,6 +589,7 @@
 		849A97561ED9EB0D007D329B /* Data */ = {
 			isa = PBXGroup;
 			children = (
+				845B14911FC2028A0013CF92 /* PseudoFeed.swift */,
 				849A97581ED9EB0D007D329B /* ArticleUtilities.swift */,
 			);
 			name = Data;
@@ -1297,6 +1300,7 @@
 				84B99C691FAE36B800ECDEDB /* FeedListFolder.swift in Sources */,
 				84F204DE1FAACB8B0076E152 /* FeedListTimelineViewController.swift in Sources */,
 				849A97A31ED9F180007D329B /* FolderTreeControllerDelegate.swift in Sources */,
+				845B14921FC2028A0013CF92 /* PseudoFeed.swift in Sources */,
 				849A97851ED9ECCD007D329B /* PreferencesWindowController.swift in Sources */,
 				849A977A1ED9EC04007D329B /* TimelineTableCellView.swift in Sources */,
 				849A97761ED9EC04007D329B /* TimelineCellAppearance.swift in Sources */,

Evergreen/Data/PseudoFeed.swift

@@ -0,0 +1,92 @@
+//
+//  PseudoFeed.swift
+//  Evergreen
+//
+//  Created by Brent Simmons on 11/19/17.
+//  Copyright © 2017 Ranchero Software. All rights reserved.
+//
+
+import Foundation
+import Data
+import RSCore
+import Account
+
+protocol PseudoFeedDelegate: DisplayNameProvider {
+
+	func fetchUnreadCount(for: Account, callback: (Int) -> Void)
+}
+
+final class PseudoFeed: UnreadCountProvider, DisplayNameProvider {
+
+	private static let fetchCoalescingDelay: TimeInterval = 0.1
+	private var timer: Timer?
+	private var unreadCounts = [Account: Int]()
+	private let delegate: PseudoFeedDelegate
+
+	var nameForDisplay: String {
+		get {
+			return delegate.nameForDisplay
+		}
+	}
+
+	var unreadCount = 0 {
+		didSet {
+			if unreadCount != oldValue {
+				postUnreadCountDidChangeNotification()
+			}
+		}
+	}
+
+	init(delegate: PseudoFeedDelegate) {
+
+		self.delegate = delegate
+	}
+
+	@objc func unreadCountDidChange(_ note: Notification) {
+
+		if let object = note.object, object is Account {
+			startCoalescingTimer()
+		}
+	}
+
+	private func fetchUnreadCount(for account: Account) {
+
+		delegate.fetchUnreadCount(for: account) { (accountUnreadCount) in
+			unreadCounts[account] = accountUnreadCount
+		}
+	}
+
+	private func fetchUnreadCounts() {
+
+		AccountManager.shared.accounts.forEach { self.fetchUnreadCount(for: $0) }
+	}
+
+	private func updateUnreadCount() {
+
+		unreadCount = AccountManager.shared.accounts.reduce(0) { (result, account) -> Int in
+			if let oneUnreadCount = unreadCounts[account] {
+				return result + oneUnreadCount
+			}
+			return result
+		}
+	}
+
+	// MARK: - Timer
+
+	private func stopTimer() {
+
+		if let timer = timer {
+			timer.rs_invalidateIfValid()
+		}
+		timer = nil
+	}
+
+	private func startCoalescingTimer() {
+
+		stopTimer()
+		timer = Timer(timeInterval: PseudoFeed.fetchCoalescingDelay, repeats: false, block: { (_) in
+			self.fetchUnreadCounts()
+			self.stopTimer()
+		})
+	}
+}