GlobFiltering.swift

// known-good: Xcode 7.3.1, Swift 2.2

/**
 Filters to only those file URLs whose filenames match the glob pattern.
 - parameter fileURLs: file URLs to filter
 - parameter filenameGlobPattern: a glob pattern to match against the filename of the file pointed to by a file URL
 */
func URLsWithFilenamesMatchingGlobPattern(fileURLs:[NSURL],filenameGlobPattern:String) -> [NSURL]
{
  let filenamePredicate = NSPredicate(format: "SELF like %@", argumentArray: [filenameGlobPattern])
  func urlFilenameMatchesGlobPattern(url:NSURL) -> Bool {
    guard url.scheme == "file" else { NSLog("%@","passed a non-file URL"); return false }
    do {
      var filenameObj:AnyObject?
      try url.getResourceValue(&filenameObj, forKey: NSURLNameKey)
      guard let filename = filenameObj as? NSString else { return false }
      return filenamePredicate.evaluateWithObject(filename)
    } catch { return false }
  }
  
  return fileURLs.filter(urlFilenameMatchesGlobPattern)
}