ref: URL utils class

src/Preview+FileInfo.swift

@@ -1,27 +1,12 @@
 import Foundation
 
 extension PreviewGenerator {
-	/// Calculate file / folder size.
-	private func getFileSize(_ path: String) -> Int64 {
-		var isDir: ObjCBool = false
-		FileManager.default.fileExists(atPath: path, isDirectory: &isDir)
-		if !isDir.boolValue {
-			return try! FileManager.default.attributesOfItem(atPath: path)[.size] as! Int64
-		}
-		var fileSize: Int64 = 0
-		for child in try! FileManager.default.subpathsOfDirectory(atPath: path) {
-			fileSize += try! FileManager.default.attributesOfItem(atPath: path + "/" + child)[.size] as! Int64
-		}
-		return fileSize
-	}
-	
 	/// Process meta information about the file itself. Like file size and last modification.
 	mutating func procFileInfo(_ url: URL) {
-		let attrs = try? FileManager.default.attributesOfItem(atPath: url.path)
 		self.apply([
 			"FileName": escapeXML(url.lastPathComponent),
-			"FileSize": ByteCountFormatter.string(fromByteCount: getFileSize(url.path), countStyle: .file),
-			"FileModified": (attrs?[.modificationDate] as? Date)?.mediumFormat() ?? "",
+			"FileSize": url.fileSizeHuman(),
+			"FileModified": url.modificationDate()?.mediumFormat() ?? "",
 		])
 	}
 }
@@ -36,3 +21,32 @@ private func escapeXML(_ stringToEscape: String) -> String {
 		.replacingOccurrences(of: "<", with: "&lt;")
 		.replacingOccurrences(of: ">", with: "&gt;")
 }
+
+
+extension URL {
+	/// Last modification date of file (or folder)
+	@inlinable func modificationDate() -> Date? {
+		(try? FileManager.default.attributesOfItem(atPath: self.path))?[.modificationDate] as? Date
+	}
+	
+	/// Calls `fileSize()`. Will convert `Int` to human readable `String`.
+	func fileSizeHuman() -> String {
+		ByteCountFormatter.string(fromByteCount: self.fileSize(), countStyle: .file)
+	}
+	
+	// MARK: - private methods
+	
+	/// Calculate file or folder size.
+	private func fileSize() -> Int64 {
+		var isDir: ObjCBool = false
+		FileManager.default.fileExists(atPath: self.path, isDirectory: &isDir)
+		if !isDir.boolValue {
+			return try! FileManager.default.attributesOfItem(atPath: self.path)[.size] as! Int64
+		}
+		var fileSize: Int64 = 0
+		for child in try! FileManager.default.subpathsOfDirectory(atPath: self.path) {
+			fileSize += try! FileManager.default.attributesOfItem(atPath: self.path + "/" + child)[.size] as! Int64
+		}
+		return fileSize
+	}
+}

src/URL+File.swift

@@ -0,0 +1,12 @@
+import Foundation
+
+extension URL {
+	/// Folder where user can mofifications to html template
+	static let UserModDir: URL? =
+		FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first
+	
+	/// Returns `true` if file or folder exists.
+	@inlinable func exists() -> Bool {
+		FileManager.default.fileExists(atPath: self.path)
+	}
+}