Returns the NSURLDocumentIdentifierKey for a file.

DocumentIdentifier.swift

#!/usr/bin/env swift

import Foundation

let args = Process.arguments

if (args.count != 2) {
    print("usage: \(args[0]) <file>\n")
    exit(-1)
}

if let url = NSURL(fileURLWithPath:args[1]) where url.checkResourceIsReachableAndReturnError(nil) {
    var error: NSError?
    var rsrc: AnyObject?
    var success = url.getResourceValue(&rsrc, forKey:NSURLDocumentIdentifierKey, error:&error)

    if let number = rsrc as? NSNumber {
        print("\(url.lastPathComponent!) : \(number)\n")
    } else {
        if let error = error {
           print("Error: \(error)")
        } else {
            print("\(url.lastPathComponent!) : \(rsrc)\n")
        }
    }

    exit(0)
} else {
    print("File not found!\n")
    exit(-1)
}