Make OPML import and export respect multiple accounts

Mac/MainWindow/OPML/ExportOPMLWindowController.swift

@@ -0,0 +1,85 @@
+//
+//  ExportOPMLWindowController.swift
+//  NetNewsWire
+//
+//  Created by Maurice Parker on 5/1/19.
+//  Copyright © 2019 Ranchero Software. All rights reserved.
+//
+
+import AppKit
+import Account
+
+class ExportOPMLWindowController: NSWindowController {
+
+	@IBOutlet weak var accountPopUpButton: NSPopUpButton!
+	private weak var hostWindow: NSWindow?
+	
+	convenience init() {
+		self.init(windowNibName: NSNib.Name("ExportOPMLSheet"))
+	}
+	
+	override func windowDidLoad() {
+		
+		accountPopUpButton.removeAllItems()
+		let menu = NSMenu()
+		for oneAccount in AccountManager.shared.sortedAccounts {
+			let oneMenuItem = NSMenuItem()
+			oneMenuItem.title = oneAccount.nameForDisplay
+			oneMenuItem.representedObject = oneAccount
+			menu.addItem(oneMenuItem)
+		}
+		accountPopUpButton.menu = menu
+		
+	}
+
+	// MARK: API
+	
+	func runSheetOnWindow(_ hostWindow: NSWindow) {
+		self.hostWindow = hostWindow
+		hostWindow.beginSheet(window!)
+	}
+	
+	// MARK: Actions
+	
+	@IBAction func cancel(_ sender: Any) {
+		hostWindow!.endSheet(window!, returnCode: NSApplication.ModalResponse.cancel)
+	}
+	
+	@IBAction func exportOPML(_ sender: Any) {
+
+		guard let menuItem = accountPopUpButton.selectedItem else {
+			return
+		}
+		let account = menuItem.representedObject as! Account
+		
+		hostWindow!.endSheet(window!, returnCode: NSApplication.ModalResponse.OK)
+		
+		let panel = NSSavePanel()
+		panel.allowedFileTypes = ["opml"]
+		panel.allowsOtherFileTypes = false
+		panel.prompt = NSLocalizedString("Export OPML", comment: "Export OPML")
+		panel.title = NSLocalizedString("Export OPML", comment: "Export OPML")
+		panel.nameFieldLabel = NSLocalizedString("Export to:", comment: "Export OPML")
+		panel.message = NSLocalizedString("Choose a location for the exported OPML file.", comment: "Export OPML")
+		panel.isExtensionHidden = false
+		panel.nameFieldStringValue = "MySubscriptions.opml"
+		
+		panel.beginSheetModal(for: hostWindow!) { result in
+			if result == NSApplication.ModalResponse.OK, let url = panel.url {
+				DispatchQueue.main.async {
+					let filename = url.lastPathComponent
+					let opmlString = OPMLExporter.OPMLString(with: account, title: filename)
+					do {
+						try opmlString.write(to: url, atomically: true, encoding: String.Encoding.utf8)
+					}
+					catch let error as NSError {
+						NSApplication.shared.presentError(error)
+					}
+				}
+			}
+		}
+		
+
+
+	}
+}