//
// 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 var isDirty = false {
didSet {
queueSaveToDiskIfNeeded()
}
}
private let saveQueue = CoalescingQueue(name: "Save Queue", interval: 0.5)
init(filename: String, account: Account) {
self.fileURL = URL(fileURLWithPath: filename)
self.account = account
}
func markAsDirty() {
isDirty = true
}
func load() {
guard let fileData = opmlFileData(), let opmlItems = parsedOPMLItems(fileData: fileData) else {
return
}
BatchUpdate.shared.perform {
account.loadOPMLItems(opmlItems)
}
}
func save() {
guard !account.isDeleted else { return }
let opmlDocumentString = opmlDocument()
do {
try opmlDocumentString.write(to: fileURL, atomically: true, encoding: .utf8)
} catch let error as NSError {
os_log(.error, log: log, "OPML save to disk failed: %@.", error.localizedDescription)
}
}
}
private extension OPMLFile {
func queueSaveToDiskIfNeeded() {
saveQueue.add(self, #selector(saveToDiskIfNeeded))
}
@objc func saveToDiskIfNeeded() {
if isDirty {
isDirty = false
save()
}
}
func opmlFileData() -> Data? {
var fileData: Data? = nil
do {
fileData = try Data(contentsOf: fileURL)
} catch {
os_log(.error, log: log, "OPML read from disk failed: %@.", error.localizedDescription)
}
return fileData
}
func parsedOPMLItems(fileData: Data) -> [RSOPMLItem]? {
let parserData = ParserData(url: fileURL.absoluteString, data: fileData)
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.escapingSpecialXMLCharacters
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, allowCustomAttributes: true)
let closingText =
"""
</body>
</opml>
"""
let opml = openingText + middleText + closingText
return opml
}
}