ref: rename PreviewGenerator

src/Preview+FileInfo.swift

@@ -0,0 +1,43 @@
+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 formattedValue : String
+		if let attrs = try? FileManager.default.attributesOfItem(atPath: url.path) {
+			let size = ByteCountFormatter.string(fromByteCount: getFileSize(url.path), countStyle: .file)
+			formattedValue = "\(size), Modified \((attrs[.modificationDate] as! Date).mediumFormat())"
+		} else {
+			formattedValue = ""
+		}
+		self.apply([
+			"FileName": escapeXML(url.lastPathComponent),
+			"FileInfo": formattedValue,
+		])
+	}
+}
+
+
+/// Replace occurrences of chars `&"'<>` with html encoding.
+private func escapeXML(_ stringToEscape: String) -> String {
+	return stringToEscape
+		.replacingOccurrences(of: "&", with: "&amp;")
+		.replacingOccurrences(of: "\"", with: "&quot;")
+		.replacingOccurrences(of: "'", with: "&apos;")
+		.replacingOccurrences(of: "<", with: "&lt;")
+		.replacingOccurrences(of: ">", with: "&gt;")
+}