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NetNewsWire/Frameworks/Account/OPMLFile.swift

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Move OPML I/O functions into a separate OPMLFile class
2019-09-13 01:05:29 +02:00
//
// 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: NSObject, NSFilePresenter {
private var log = OSLog(subsystem: Bundle.main.bundleIdentifier!, category: "account")
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private var isDirty = false {
didSet {
queueSaveToDiskIfNeeded()
}
}
private var isLoading = false
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private let fileURL: URL
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private let account: Account
private let operationQueue: OperationQueue
var presentedItemURL: URL? {
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return fileURL
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}
var presentedItemOperationQueue: OperationQueue {
return operationQueue
}
init(filename: String, account: Account) {
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self.fileURL = URL(fileURLWithPath: filename)
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self.account = account
operationQueue = OperationQueue()
operationQueue.maxConcurrentOperationCount = 1
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super.init()
NSFileCoordinator.addFilePresenter(self)
}
func presentedItemDidChange() {
DispatchQueue.main.async {
self.reload()
}
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}
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func markAsDirty() {
if !isLoading {
isDirty = true
}
}
func queueSaveToDiskIfNeeded() {
Account.saveQueue.add(self, #selector(saveToDiskIfNeeded))
}
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func load() {
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isLoading = true
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guard let opmlItems = parsedOPMLItems() else { return }
BatchUpdate.shared.perform {
account.loadOPMLItems(opmlItems, parentFolder: nil)
}
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isLoading = false
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}
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}
private extension OPMLFile {
@objc func saveToDiskIfNeeded() {
if isDirty && !account.isDeleted {
isDirty = false
save()
}
}
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func save() {
let opmlDocumentString = opmlDocument()
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let errorPointer: NSErrorPointer = nil
let fileCoordinator = NSFileCoordinator(filePresenter: self)
fileCoordinator.coordinate(writingItemAt: fileURL, options: .forReplacing, 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)
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}
}
func reload() {
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isLoading = true
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guard let opmlItems = parsedOPMLItems() else { return }
BatchUpdate.shared.perform {
account.topLevelFeeds.removeAll()
account.loadOPMLItems(opmlItems, parentFolder: nil)
}
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isLoading = false
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}
func parsedOPMLItems() -> [RSOPMLItem]? {
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var fileData: Data? = nil
let errorPointer: NSErrorPointer = nil
let fileCoordinator = NSFileCoordinator(filePresenter: self)
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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)
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}
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Move OPML I/O functions into a separate OPMLFile class
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guard let opmlData = fileData else {
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return nil
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}
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let parserData = ParserData(url: fileURL.absoluteString, data: opmlData)
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var opmlDocument: RSOPMLDocument?
do {
opmlDocument = try RSOPMLParser.parseOPML(with: parserData)
} catch {
os_log(.error, log: log, "OPML Import failed: %@.", error.localizedDescription)
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return nil
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}
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return opmlDocument?.children
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}
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)
let closingText =
"""
</body>
</opml>
"""
let opml = openingText + middleText + closingText
return opml
}
}