Refactors GeneralPrefs Model

Multiplatform/macOS/Preferences/Preference Panes/General/GeneralPreferencesModel.swift

@@ -0,0 +1,129 @@
+//
+//  GeneralPreferencesModel.swift
+//  Multiplatform macOS
+//
+//  Created by Stuart Breckenridge on 12/7/20.
+//  Copyright © 2020 Ranchero Software. All rights reserved.
+//
+
+import Foundation
+
+
+
+class GeneralPreferencesModel: ObservableObject {
+	
+	@Published var rssReaders = [RSSReader]()
+	@Published var readerSelection: Int = 0 {
+		willSet {
+			if newValue != readerSelection {
+				registerAppWithBundleID(rssReaders[newValue].bundleID)
+			}
+		}
+	}
+	
+	private let readerInfo = RSSReaderInfo()
+	
+	init() {
+		prepareRSSReaders()
+	}
+	
+}
+
+// MARK:- RSS Readers
+
+private extension GeneralPreferencesModel {
+	
+	func prepareRSSReaders() {
+		
+		// Populate rssReaders
+		var thisApp = RSSReader(bundleID: Bundle.main.bundleIdentifier!)
+		thisApp?.nameMinusAppSuffix.append(" (this app—multiplatform)")
+		
+		let otherRSSReaders = readerInfo.rssReaders.filter { $0.bundleID != Bundle.main.bundleIdentifier! }.sorted(by: { $0.nameMinusAppSuffix < $1.nameMinusAppSuffix })
+		rssReaders.append(thisApp!)
+		rssReaders.append(contentsOf: otherRSSReaders)
+		
+		if readerInfo.defaultRSSReaderBundleID != nil {
+			let defaultReader = rssReaders.filter({ $0.bundleID == readerInfo.defaultRSSReaderBundleID })
+			if defaultReader.count == 1 {
+				let reader = defaultReader[0]
+				readerSelection = rssReaders.firstIndex(of: reader)!
+			}
+		}
+	}
+	
+	func registerAppWithBundleID(_ bundleID: String) {
+		NSWorkspace.shared.setDefaultAppBundleID(forURLScheme: "feed", to: bundleID)
+		NSWorkspace.shared.setDefaultAppBundleID(forURLScheme: "feeds", to: bundleID)
+	}
+	
+}
+
+
+// MARK: - RSSReaderInfo
+
+struct RSSReaderInfo {
+
+	var defaultRSSReaderBundleID: String? {
+		NSWorkspace.shared.defaultAppBundleID(forURLScheme: RSSReaderInfo.feedURLScheme)
+	}
+	let rssReaders: Set<RSSReader>
+	static let feedURLScheme = "feed:"
+
+	init() {
+		self.rssReaders = RSSReaderInfo.fetchRSSReaders()
+	}
+
+	static func fetchRSSReaders() -> Set<RSSReader> {
+		let rssReaderBundleIDs = NSWorkspace.shared.bundleIDsForApps(forURLScheme: feedURLScheme)
+
+		var rssReaders = Set<RSSReader>()
+		rssReaderBundleIDs.forEach { (bundleID) in
+			if let reader = RSSReader(bundleID: bundleID) {
+				rssReaders.insert(reader)
+			}
+		}
+		return rssReaders
+	}
+}
+
+
+// MARK: - RSSReader
+
+struct RSSReader: Hashable {
+
+	let bundleID: String
+	let name: String
+	var nameMinusAppSuffix: String
+	let path: String
+
+	init?(bundleID: String) {
+		guard let path = NSWorkspace.shared.urlForApplication(withBundleIdentifier: bundleID) else {
+			return nil
+		}
+
+		self.path = path.path
+		self.bundleID = bundleID
+
+		let name = (self.path as NSString).lastPathComponent
+		self.name = name
+		if name.hasSuffix(".app") {
+			self.nameMinusAppSuffix = name.stripping(suffix: ".app")
+		}
+		else {
+			self.nameMinusAppSuffix = name
+		}
+	}
+
+	// MARK: - Hashable
+
+	func hash(into hasher: inout Hasher) {
+		hasher.combine(bundleID)
+	}
+
+	// MARK: - Equatable
+
+	static func ==(lhs: RSSReader, rhs: RSSReader) -> Bool {
+		return lhs.bundleID == rhs.bundleID
+	}
+}