func_lister.swift

//  UPGRADED TO SWIFT 3
//  fn_lister.swift
//  MTB_Kit
//
//  Created by Mel Massadian on 04/10/16.
//  Copyright © 2016 Mel Massadian. All rights reserved.
//
import Cocoa
import Foundation
import AppKit

// Get contents of directory at specified path, returning (filenames, nil) or (nil, error)

func lutLister(path: String) -> [(filenames: String,luts:[String])] {
    
    // Returns the array containing a tupple per folder with an Array of the folder content.
    
    // INITIALIZE
    var newPath = ""
    var thosLut:[String] = []
    var collection:[(String,[String])]=[("Collections",["LUTS"])]
    
    let fm = FileManager.default
    var isDir: ObjCBool = true
    
    
    do {
        // Return folder content as Array
        let items = try fm.contentsOfDirectory(atPath: path)
        // Loop Lut Folders Cats
        for item in items {
            // Check if is Directory
            if fm.fileExists(atPath: item, isDirectory: &isDir)==false{
            
                // TODO: Find a better way for path concatenation
                newPath = path+"/"+item
                
                // Return LUTs as Array in Category
                thosLut = try fm.contentsOfDirectory(atPath: newPath)
 
                // Append to Collection
                collection.append((item,thosLut))
                
            }
        }
        return collection

    } catch {
        print(error)
        return [(filenames:"Nope",error:["error"]) as! (filenames: String, luts: Array<String>)]
    }
    
    
}

//let bundleURL = Bundle.main.resourceURL!
//let lutURL = URL(string:"luts", relativeTo:bundleURL)!

let lut = "/Users/me/LUT_Folders/"
var lutFolders = lutLister(path: lut)

for (categorie,luts) in lutFolders {
        print(categorie,luts)
}