NetNewsWire/Evergreen/FeedList/FeedListTreeControllerDeleg...

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//
// FeedListTreeControllerDelegate.swift
// Evergreen
//
// Created by Brent Simmons on 11/4/17.
// Copyright © 2017 Ranchero Software. All rights reserved.
//
import Foundation
import RSTree
import RSCore
// Folders and feeds that appear in the Feed Directory are pulled from three sources:
// 1. Feeds added in code here. (Evergreen News should be the only one.)
// 2. Default feeds for new users see DefaultFeeds.plist.
// 3. FeedList.plist the main directory. Its top level is all folders. There are no sub-folders.
// Its okay if theres overlap: a feed may appear in multiple places.
// If theres any problem with the data (wrong types), this will crash. By design.
final class FeedListTreeControllerDelegate: TreeControllerDelegate {
private let topLevelFeeds: Set<FeedListFeed>
private let folders: Set<FeedListFolder>
init() {
let evergreenNewsFeed = FeedListFeed(name: "Evergreen News", url: "https://ranchero.com/evergreen/feed.json", homePageURL: "https://ranchero.com/evergreen/blog/")
self.topLevelFeeds = Set([evergreenNewsFeed])
let defaultFeeds = FeedListReader.defaultFeeds()
let defaultFeedsFolder = FeedListFolder(name: NSLocalizedString("Default Feeds (for new users)", comment: "Feed Directory"), feeds: defaultFeeds)
self.folders = Set(FeedListReader.folders() + [defaultFeedsFolder])
}
func treeController(treeController: TreeController, childNodesFor node: Node) -> [Node]? {
if node.isRoot {
return childNodesForRootNode(node)
}
return childNodesForFolderNode(node)
}
}
// MARK: - Private
private extension FeedListTreeControllerDelegate {
func childNodesForRootNode(_ rootNode: Node) -> [Node]? {
let children = (Array(topLevelFeeds) as [AnyHashable]) + (Array(folders) as [AnyHashable])
return childNodesForContainerNode(rootNode, children)
}
func childNodesForFolderNode(_ folderNode: Node) -> [Node]? {
let folder = folderNode.representedObject as! FeedListFolder
return childNodesForContainerNode(folderNode, Array(folder.feeds))
}
func childNodesForContainerNode(_ containerNode: Node, _ children: [AnyHashable]) -> [Node]? {
let nodes = unsortedNodes(parent: containerNode, children: children)
return Node.nodesSortedAlphabeticallyWithFoldersAtEnd(nodes)
}
func unsortedNodes(parent: Node, children: [AnyHashable]) -> [Node] {
return children.map{ createNode(child: $0, parent: parent) }
}
func createNode(child: AnyHashable, parent: Node) -> Node {
if let feed = child as? FeedListFeed {
return createNode(feed: feed, parent: parent)
}
let folder = child as! FeedListFolder
return createNode(folder: folder, parent: parent)
}
func createNode(feed: FeedListFeed, parent: Node) -> Node {
return Node(representedObject: feed, parent: parent)
}
func createNode(folder: FeedListFolder, parent: Node) -> Node {
let node = Node(representedObject: folder, parent: parent)
node.canHaveChildNodes = true
return node
}
}
// MARK: - Loading from Disk
private struct FeedListReader {
static func folders() -> Set<FeedListFolder> {
return Set(foldersDictionary().map { (arg: (key: String, value: [[String : String]])) -> FeedListFolder in
let (name, feedDictionaries) = arg
return FeedListFolder(name: name, feeds: feeds(with: feedDictionaries))
})
}
static func defaultFeeds() -> Set<FeedListFeed> {
return feeds(with: defaultFeedDictionaries())
}
private static func defaultFeedDictionaries() -> [[String: String]] {
let f = Bundle.main.path(forResource: "DefaultFeeds", ofType: "plist")!
return NSArray(contentsOfFile: f)! as! [[String: String]]
}
private static func foldersDictionary() -> [String: [[String: String]]] {
let f = Bundle.main.path(forResource: "FeedList", ofType: "plist")!
return NSDictionary(contentsOfFile: f)! as! [String: [[String: String]]]
}
private static func feeds(with dictionaries: [[String: String]]) -> Set<FeedListFeed> {
return Set(dictionaries.map { FeedListFeed(dictionary: $0) })
}
}