New: Remove empty subfolders after renaming FileSetLastWriteTime

Closes #490

src/NzbDrone.Common/Disk/DiskProviderBase.cs

@@ -418,5 +418,19 @@ namespace NzbDrone.Common.Disk
 
             return di.GetFiles().ToList();
         }
+
+        public void RemoveEmptySubfolders(string path)
+        {
+            var subfolders = GetDirectories(path);
+            var files = GetFiles(path, SearchOption.AllDirectories);
+
+            foreach (var subfolder in subfolders)
+            {
+                if (files.None(f => subfolder.IsParentPath(f)))
+                {
+                    DeleteFolder(path, false);
+                }
+            }
+        }
     }
 }

src/NzbDrone.Common/Disk/IDiskProvider.cs

@@ -47,5 +47,6 @@ namespace NzbDrone.Common.Disk
         IMount GetMount(string path);
         List<DirectoryInfo> GetDirectoryInfos(string path);
         List<FileInfo> GetFileInfos(string path);
+        void RemoveEmptySubfolders(string path);
     }
 }

src/NzbDrone.Core/MediaFiles/RenameEpisodeFileService.cs

@@ -3,6 +3,7 @@ using System.Collections.Generic;
 using System.IO;
 using System.Linq;
 using NLog;
+using NzbDrone.Common.Disk;
 using NzbDrone.Common.Extensions;
 using NzbDrone.Common.Instrumentation.Extensions;
 using NzbDrone.Core.MediaFiles.Commands;
@@ -30,6 +31,7 @@ namespace NzbDrone.Core.MediaFiles
         private readonly IEventAggregator _eventAggregator;
         private readonly IEpisodeService _episodeService;
         private readonly IBuildFileNames _filenameBuilder;
+        private readonly IDiskProvider _diskProvider;
         private readonly Logger _logger;
 
         public RenameEpisodeFileService(ISeriesService seriesService,
@@ -38,6 +40,7 @@ namespace NzbDrone.Core.MediaFiles
                                         IEventAggregator eventAggregator,
                                         IEpisodeService episodeService,
                                         IBuildFileNames filenameBuilder,
+                                        IDiskProvider diskProvider,
                                         Logger logger)
         {
             _seriesService = seriesService;
@@ -46,6 +49,7 @@ namespace NzbDrone.Core.MediaFiles
             _eventAggregator = eventAggregator;
             _episodeService = episodeService;
             _filenameBuilder = filenameBuilder;
+            _diskProvider = diskProvider;
             _logger = logger;
         }
 
@@ -134,6 +138,8 @@ namespace NzbDrone.Core.MediaFiles
 
             if (renamed.Any())
             {
+                _diskProvider.RemoveEmptySubfolders(series.Path);
+
                 _eventAggregator.PublishEvent(new SeriesRenamedEvent(series));
             }
         }