Added auto complete to AddSeries RootDir

NzbDrone.Api/Directories/DirectoryModule.cs

@@ -0,0 +1,60 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Nancy;
+using NzbDrone.Api.Extentions;
+using NzbDrone.Common;
+using NzbDrone.Core.RootFolders;
+
+namespace NzbDrone.Api.Directories
+{
+    public class DirectoryModule : NzbDroneApiModule
+    {
+        private readonly DiskProvider _diskProvider;
+
+        public DirectoryModule(DiskProvider diskProvider)
+            : base("/directories")
+        {
+            _diskProvider = diskProvider;
+            Post["/"] = x => GetDirectories();
+        }
+
+        private Response GetDirectories()
+        {
+            if (!Request.Form.query.HasValue)
+                return new List<string>().AsResponse();
+
+            string query = Request.Form.query.Value;
+
+            IEnumerable<String> dirs = null;
+            try
+            {
+                //Windows (Including UNC)
+                var windowsSep = query.LastIndexOf('\\');
+
+                if (windowsSep > -1)
+                {
+                    dirs = _diskProvider.GetDirectories(query.Substring(0, windowsSep + 1));
+                }
+
+                //Unix
+                var index = query.LastIndexOf('/');
+
+                if (index > -1)
+                {
+                    dirs = _diskProvider.GetDirectories(query.Substring(0, index + 1));
+                }
+            }
+            catch (Exception)
+            {
+                //Swallow the exceptions so proper JSON is returned to the client (Empty results)
+                return new List<string>().AsResponse();
+            }
+
+            if (dirs == null)
+                throw new Exception("A valid path was not provided");
+
+            return dirs.AsResponse();
+        }
+    }
+}