Directory lookup will not include some folders at base of drive

NzbDrone.Common/DirectoryLookupService.cs

@@ -0,0 +1,62 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+
+namespace NzbDrone.Common
+{
+    public interface IDirectoryLookupService
+    {
+        List<String> LookupSubDirectories(string query);
+    }
+
+    public class DirectoryLookupService : IDirectoryLookupService
+    {
+        private readonly IDiskProvider _diskProvider;
+
+        public DirectoryLookupService(IDiskProvider diskProvider)
+        {
+            _diskProvider = diskProvider;
+        }
+
+        public List<String> LookupSubDirectories(string query)
+        {
+            List<String> dirs = null;
+            try
+            {
+                //Windows (Including UNC)
+                var windowsSep = query.LastIndexOf('\\');
+
+                if (windowsSep > -1)
+                {
+                    var path = query.Substring(0, windowsSep + 1);
+                    var dirsList = _diskProvider.GetDirectories(path).ToList();
+
+                    if (Path.GetPathRoot(path).Equals(path, StringComparison.InvariantCultureIgnoreCase))
+                    {
+                        var setToRemove = new HashSet<string> { "$Recycle.Bin", "System Volume Information" };
+                        dirsList.RemoveAll(x => setToRemove.Contains(new DirectoryInfo(x).Name));
+                    }
+
+                    dirs = dirsList;
+                }
+
+                //Unix
+                var index = query.LastIndexOf('/');
+
+                if (index > -1)
+                {
+                    dirs = _diskProvider.GetDirectories(query.Substring(0, index + 1)).ToList();
+                }
+            }
+            catch (Exception)
+            {
+                //Swallow the exceptions so proper JSON is returned to the client (Empty results)
+                return new List<string>();
+            }
+
+            return dirs;
+        }
+    }
+}