Getting the Size of a file or directory in Swift

fiindsize.swift

//
//  main.swift
//  findsize
//
//  Created by Ray Fix on 2/6/16.
//  Copyright © 2016 Neko Labs. All rights reserved.
//

import Foundation

enum FileErrors : ErrorType {
    case BadEnumeration
    case BadResource
}

func findSize(path: String) throws -> UInt64 {
    

    let fullPath = (path as NSString).stringByExpandingTildeInPath
    let fileAttributes: NSDictionary = try NSFileManager.defaultManager().attributesOfItemAtPath(fullPath)

    if fileAttributes.fileType() == NSFileTypeRegular {
        return fileAttributes.fileSize()
    }
    
    let url = NSURL(fileURLWithPath: fullPath)
    guard let directoryEnumerator = NSFileManager.defaultManager().enumeratorAtURL(url, includingPropertiesForKeys: [NSURLFileSizeKey], options: [.SkipsHiddenFiles], errorHandler: nil) else { throw FileErrors.BadEnumeration }
    
    var total: UInt64 = 0
    
    for (index, object) in directoryEnumerator.enumerate() {
        guard let fileURL = object as? NSURL else { throw FileErrors.BadResource }
        var fileSizeResource: AnyObject?
        try fileURL.getResourceValue(&fileSizeResource, forKey: NSURLFileSizeKey)
        guard let fileSize = fileSizeResource as? NSNumber else { continue }
        total += fileSize.unsignedLongLongValue
        if index % 1000 == 0 {
            print(".", terminator: "")
        }
    }
    return total
}


if Process.arguments.count < 2 {
    print("usage: findsize filenames")
}

do {
    let totalSize = try Process.arguments.dropFirst().reduce(UInt64(0)) { $0 + (try findSize($1)) }
    
    let formatter = NSNumberFormatter()
    formatter.numberStyle = .DecimalStyle
    formatter.formatterBehavior = .Behavior10_4
    let pretty = formatter.stringFromNumber(NSNumber(unsignedLongLong: totalSize))
    
    
    print("\nTotal Size: \(pretty)")
}
catch let error as NSError {
    print(error.localizedDescription)
}
catch {
    print(error)
}