//
// OPMLFile.swift
// Account
//
// Created by Maurice Parker on 9/12/19.
// Copyright © 2019 Ranchero Software, LLC. All rights reserved.
//
import Foundation
import os.log
import RSCore
import RSParser
final class OPMLFile {
private var log = OSLog(subsystem: Bundle.main.bundleIdentifier!, category: "opmlFile")
private let fileURL: URL
private let account: Account
private lazy var managedFile = ManagedResourceFile(fileURL: fileURL, load: loadCallback, save: saveCallback)
init(filename: String, account: Account) {
self.fileURL = URL(fileURLWithPath: filename)
self.account = account
}
func markAsDirty() {
managedFile.markAsDirty()
}
func load() {
managedFile.load()
}
func save() {
managedFile.saveIfNecessary()
}
}
private extension OPMLFile {
func loadCallback() {
guard let opmlItems = parsedOPMLItems() else { return }
BatchUpdate.shared.perform {
account.topLevelWebFeeds.removeAll()
account.loadOPMLItems(opmlItems, parentFolder: nil)
}
}
func saveCallback() {
guard !account.isDeleted else { return }
let opmlDocumentString = opmlDocument()
let errorPointer: NSErrorPointer = nil
let fileCoordinator = NSFileCoordinator(filePresenter: managedFile)
fileCoordinator.coordinate(writingItemAt: fileURL, options: [], error: errorPointer, byAccessor: { writeURL in
do {
try opmlDocumentString.write(to: writeURL, atomically: true, encoding: .utf8)
} catch let error as NSError {
os_log(.error, log: log, "OPML save to disk failed: %@.", error.localizedDescription)
}
})
if let error = errorPointer?.pointee {
os_log(.error, log: log, "OPML save to disk coordination failed: %@.", error.localizedDescription)
}
}
func parsedOPMLItems() -> [RSOPMLItem]? {
var fileData: Data? = nil
let errorPointer: NSErrorPointer = nil
let fileCoordinator = NSFileCoordinator(filePresenter: managedFile)
fileCoordinator.coordinate(readingItemAt: fileURL, options: [], error: errorPointer, byAccessor: { readURL in
do {
fileData = try Data(contentsOf: readURL)
} catch {
// Commented out because it’s not an error on first run.
// TODO: make it so we know if it’s first run or not.
//NSApplication.shared.presentError(error)
os_log(.error, log: log, "OPML read from disk failed: %@.", error.localizedDescription)
}
})
if let error = errorPointer?.pointee {
os_log(.error, log: log, "OPML read from disk coordination failed: %@.", error.localizedDescription)
}
guard let opmlData = fileData else {
return nil
}
let parserData = ParserData(url: fileURL.absoluteString, data: opmlData)
var opmlDocument: RSOPMLDocument?
do {
opmlDocument = try RSOPMLParser.parseOPML(with: parserData)
} catch {
os_log(.error, log: log, "OPML Import failed: %@.", error.localizedDescription)
return nil
}
return opmlDocument?.children
}
func opmlDocument() -> String {
let escapedTitle = account.nameForDisplay.rs_stringByEscapingSpecialXMLCharacters()
let openingText =
"""
<?xml version="1.0" encoding="UTF-8"?>
<!-- OPML generated by NetNewsWire -->
<opml version="1.1">
<head>
<title>\(escapedTitle)</title>
</head>
<body>
"""
let middleText = account.OPMLString(indentLevel: 0, strictConformance: false)
let closingText =
"""
</body>
</opml>
"""
let opml = openingText + middleText + closingText
return opml
}
}