Start work on adding feeds and folders.

Evergreen/Data/DefaultFeedsImporter.swift

@@ -10,14 +10,14 @@ import Foundation
 import Data
 import Account
 
-private typealias DiskFeedDictionary = [String: String]
+typealias DiskFeedDictionary = [String: String]
 
 struct DefaultFeedsImporter {
 	
 	static func importIfNeeded(_ firstRun: Bool, account: Account) {
 		
 		if shouldImportDefaultFeeds(firstRun) {
-			FeedsImporter.import(defaultFeeds(), account: account)
+			FeedsImporter.importFeeds(defaultFeeds(), account: account)
 		}
 	}
 	
@@ -44,10 +44,10 @@ struct DefaultFeedsImporter {
 
 struct FeedsImporter {
 	
-	func import(_ feedDictionaries: [DiskFeedDictionary], account: Account) {
+	func importFeeds(_ feedDictionaries: [DiskFeedDictionary], account: Account) {
 		
-		let feeds = feeds(with: feedDictionaries)
-		feeds.forEach { let _ = account.addItem($0) }
+		let feedsToImport = feeds(with: feedDictionaries)
+		feedsToImport.forEach(account.addItem)
 	}
 	
 	private func feeds(with feedDictionaries: [DiskFeedDictionary]) -> Set<Feed> {

Evergreen/MainWindow/Timeline/TimelineViewController.swift

@@ -228,7 +228,7 @@ class TimelineViewController: NSViewController, NSTableViewDelegate, NSTableView
 		guard let articles = note.appInfo?.articles else {
 			return
 		}
-		reloadCellsForArticles(articles)
+		reloadCellsForArticles(Array(articles))
 	}
 
 	func fontSizeInDefaultsDidChange() {
@@ -312,7 +312,7 @@ class TimelineViewController: NSViewController, NSTableViewDelegate, NSTableView
 		return nil
 	}
 	
-	private func reloadCellsForArticles(_ articles: Set<Article>) {
+	private func reloadCellsForArticles(_ articles: [Article]) {
 		
 		let indexes = indexesForArticles(articles)
 		tableView.reloadData(forRowIndexes: indexes, columnIndexes: NSIndexSet(index: 0) as IndexSet)
@@ -320,7 +320,7 @@ class TimelineViewController: NSViewController, NSTableViewDelegate, NSTableView
 	
 	// MARK: Articles
 
-	private func indexesForArticles(_ articles: Set<Article>) -> IndexSet {
+	private func indexesForArticles(_ articles: [Article]) -> IndexSet {
 		
 		var indexes = IndexSet()
 		

Frameworks/Account/Account.swift

@@ -79,7 +79,35 @@ public final class Account: DisplayNameProvider, Hashable {
 		
 		return nil //TODO
 	}
-	
+
+	public func canAddFeed(_ feed: Feed, to folder: Folder?) -> Bool {
+
+		// If folder is nil, then it should go at the top level.
+		// The same feed in multiple folders is allowed.
+		// But the same feed can’t appear twice in the same folder
+		// (or at the top level).
+
+		return true // TODO
+	}
+
+	public func addFeed(_ feed: Feed, to folder: Folder?) -> Bool {
+
+		// Return false if it couldn’t be added.
+		// If it already existed in that folder, return true.
+
+		return true // TODO
+	}
+
+	public func canAddFolder(_ folder: Folder, to folder: Folder?) -> Bool {
+
+		return false // TODO
+	}
+
+	public func addFolder(_ folder: Folder, to folder: Folder?) -> Bool {
+
+		return false // TODO
+	}
+
 	public func importOPML(_ opmlDocument: RSOPMLDocument) {
 	
 		// TODO

Frameworks/Account/Container/Container.swift

@@ -18,7 +18,7 @@ extension NSNotification.Name {
 }
 
 public protocol Container {
-	
+
 	//Recursive
 	func hasAtLeastOneFeed() -> Bool
 	func flattenedFeeds() -> Set<Feed>

Frameworks/Account/Extensions/Feed+Account.swift

@@ -21,13 +21,4 @@ public extension Feed {
 			return accountWithID(accountID)
 		}
 	}
-	
-	struct DictionaryKey {
-		static let 
-	}
-	
-	init?(accountID: String, feedDictionary: FeedDictionary) {
-		
-		
-	}
 }

Frameworks/Data/Feed.swift

@@ -10,7 +10,7 @@ import Foundation
 import RSCore
 import RSWeb
 
-public final class Feed: DisplayNameProvider, UnreadCountProvider, Hashable {
+public final class Feed: DisplayNameProvider, UnreadCountProvider, Codable, Hashable {
 
 	public let accountID: String
 	public let url: String