63 lines
1.6 KiB
Swift
63 lines
1.6 KiB
Swift
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//
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// File.swift
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//
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//
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// Created by iMac on 01.12.21.
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//
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import Foundation
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protocol DiskWriter {
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var storageFile: FileHandle { get }
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var storageFileUrl: URL { get }
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}
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extension DiskWriter {
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static func prepareFile(at url: URL) throws -> FileHandle {
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if !FileManager.default.fileExists(atPath: url.path) {
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try Data().write(to: url)
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}
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return try FileHandle(forUpdating: url)
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}
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func writeToDisk(line: String) -> Bool {
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let data = (line + "\n").data(using: .utf8)!
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do {
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if #available(macOS 10.15.4, *) {
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try storageFile.write(contentsOf: data)
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} else {
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storageFile.write(data)
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}
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try storageFile.synchronize()
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return true
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} catch {
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print("Failed to save data to file: \(storageFileUrl.path): \(error)")
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return false
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}
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}
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func readLinesFromDisk() throws -> [String] {
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if #available(macOS 10.15.4, *) {
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guard let data = try storageFile.readToEnd() else {
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try storageFile.seekToEnd()
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return []
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}
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return parseLines(data: data)
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} else {
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let data = storageFile.readDataToEndOfFile()
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return parseLines(data: data)
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}
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}
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private func parseLines(data: Data) -> [String] {
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String(data: data, encoding: .utf8)!
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.components(separatedBy: "\n")
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.map { $0.trimmingCharacters(in: .whitespacesAndNewlines) }
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.filter { $0 != "" }
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}
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}
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