Feed count model

Model/UnwatchedFeedCountModel.swift

@@ -0,0 +1,32 @@
+import Foundation
+import SwiftUI
+
+final class UnwatchedFeedCountModel: ObservableObject {
+    static let shared = UnwatchedFeedCountModel()
+
+    @Published var unwatched = [Account: Int]()
+    @Published var unwatchedByChannel = [Account: [Channel.ID: Int]]()
+
+    private var accounts = AccountsModel.shared
+
+    var unwatchedText: Text? {
+        if let account = accounts.current,
+           !account.anonymous,
+           let count = unwatched[account]
+        {
+            return Text(String(count))
+        }
+
+        return nil
+    }
+
+    func unwatchedByChannelText(_ channel: Channel) -> Text? {
+        if let account = accounts.current,
+           !account.anonymous,
+           let count = unwatchedByChannel[account]?[channel.id]
+        {
+            return Text(String(count))
+        }
+        return nil
+    }
+}