async/background TryDeleteIfExistsAsync & DeleteContentsOfDir

Code/IO/IOUtils.cs

@@ -118,18 +118,29 @@ namespace Flowframes.IO
 			}
 		}
 
-		public static void DeleteContentsOfDir(string path)
+		/// <summary>
+		/// Async version of DeleteContentsOfDir, won't block main thread.
+		/// </summary>
+		public static async Task<bool> DeleteContentsOfDirAsync(string path)
 		{
-			DirectoryInfo directoryInfo = new DirectoryInfo(path);
+			return await Task.Run(async () => { return DeleteContentsOfDir(path); });  // Delete in background thread
-			FileInfo[] files = directoryInfo.GetFiles();
-			foreach (FileInfo fileInfo in files)
-			{
-				fileInfo.Delete();
 		}
-			DirectoryInfo[] directories = directoryInfo.GetDirectories();
+
-			foreach (DirectoryInfo directoryInfo2 in directories)
+		/// <summary>
+		/// Delete everything inside a directory except the dir itself.
+		/// </summary>
+		public static bool DeleteContentsOfDir(string path)
 		{
-				directoryInfo2.Delete(recursive: true);
+            try
+            {
+				DeleteIfExists(path);
+				Directory.CreateDirectory(path);
+				return true;
+			}
+			catch(Exception e)
+            {
+				Logger.Log("DeleteContentsOfDir Error: " + e.Message, true);
+				return false;
             }
 		}
 
@@ -245,36 +256,6 @@ namespace Flowframes.IO
 			}
 		}
 
-		public static async Task<Dictionary<string, string>> RenameCounterDirReversibleAsync(string path, string ext, int startAt, int padding = 0)
-		{
-			Stopwatch sw = new Stopwatch();
-			sw.Restart();
-			Dictionary<string, string> oldNewNamesMap = new Dictionary<string, string>();
-
-			int counter = startAt;
-			FileInfo[] files = new DirectoryInfo(path).GetFiles($"*.{ext}", SearchOption.TopDirectoryOnly);
-			var filesSorted = files.OrderBy(n => n);
-
-			foreach (FileInfo file in files)
-			{
-				string dir = new DirectoryInfo(file.FullName).Parent.FullName;
-				int filesDigits = (int)Math.Floor(Math.Log10((double)files.Length) + 1);
-				string newFilename = (padding > 0) ? counter.ToString().PadLeft(padding, '0') : counter.ToString();
-				string outpath = outpath = Path.Combine(dir, newFilename + Path.GetExtension(file.FullName));
-				File.Move(file.FullName, outpath);
-				oldNewNamesMap.Add(file.FullName, outpath);
-				counter++;
-
-				if(sw.ElapsedMilliseconds > 100)
-                {
-					await Task.Delay(1);
-					sw.Restart();
-                }
-			}
-
-			return oldNewNamesMap;
-		}
-
 		public static async Task ReverseRenaming(string basePath, Dictionary<string, string> oldNewMap)	// Relative -> absolute paths
 		{
 			Dictionary<string, string> absPaths = oldNewMap.ToDictionary(x => Path.Combine(basePath, x.Key), x => Path.Combine(basePath, x.Value));
@@ -347,8 +328,10 @@ namespace Flowframes.IO
 
 		public static async Task<Size> GetVideoOrFramesRes (string path)
         {
-			Size res;
+			Size res = new Size();
 
+            try
+            {
 				if (!IsPathDirectory(path))     // If path is video
 				{
 					res = GetVideoRes(path);
@@ -357,6 +340,11 @@ namespace Flowframes.IO
 				{
 					Image thumb = await MainUiFunctions.GetThumbnail(path);
 					res = new Size(thumb.Width, thumb.Height);
+				}
+			}
+			catch (Exception e)
+            {
+				Logger.Log("GetVideoOrFramesRes Error: " + e.Message);
             }
 
 			return res;
@@ -379,12 +367,30 @@ namespace Flowframes.IO
 			return size;
 		}
 
+		/// <summary>
+		/// Async (background thread) version of TryDeleteIfExists. Safe to run without awaiting.
+		/// </summary>
+		public static async Task<bool> TryDeleteIfExistsAsync(string path)
+		{
+			string renamedPath = path;
+
+			while (Directory.Exists(renamedPath))	// Keep adding a "_" to the end if there is still an undeleted dir (unlikely)
+				renamedPath += "_";
+
+			Directory.Move(path, renamedPath);  // Move/rename, so a new folder can be created without waiting this one's deletion
+			return await Task.Run(async () => { return TryDeleteIfExists(renamedPath); });	// Delete in background thread
+		}
+
+		/// <summary>
+		/// Delete a path if it exists. Works for files and directories. Returns success status.
+		/// </summary>
 		public static bool TryDeleteIfExists(string path)      // Returns true if no exception occurs
 		{
             try
             {
 				if (path == null)
 					return false;
+
 				DeleteIfExists(path);
 				return true;
 			}
@@ -397,16 +403,20 @@ namespace Flowframes.IO
 
 		public static bool DeleteIfExists (string path)		// Returns true if the file/dir exists
         {
+			Logger.Log($"DeleteIfExists({path})", true);
+
 			if (!IsPathDirectory(path) && File.Exists(path))
             {
 				File.Delete(path);
 				return true;
             }
+
 			if (IsPathDirectory(path) && Directory.Exists(path))
 			{
 				Directory.Delete(path, true);
 				return true;
 			}
+
 			return false;
         }
 

Code/Main/CreateVideo.cs

@@ -100,12 +100,12 @@ namespace Flowframes.Main
             }
 
             if (!stepByStep)
-                IOUtils.DeleteContentsOfDir(I.current.interpFolder);
+                await IOUtils.DeleteContentsOfDirAsync(I.current.interpFolder);
         }
 
         static async Task CopyOutputFrames(string framesPath, string framesFile, string outputFolderPath, bool dontMove)
         {
-            IOUtils.TryDeleteIfExists(outputFolderPath);
+            await IOUtils.TryDeleteIfExistsAsync(outputFolderPath);
             IOUtils.CreateDir(outputFolderPath);
             Stopwatch sw = new Stopwatch();
             sw.Restart();

Code/Main/Interpolate.cs

@@ -242,11 +242,11 @@ namespace Flowframes
                 {
                     DialogResult dialogResult = MessageBox.Show($"Delete the temp folder (Yes) or keep it for resuming later (No)?", "Delete temporary files?", MessageBoxButtons.YesNo);
                     if (dialogResult == DialogResult.Yes)
-                        IOUtils.TryDeleteIfExists(current.tempFolder);
+                        Task.Run(async () => { await IOUtils.TryDeleteIfExistsAsync(current.tempFolder); });
                 }
                 else
                 {
-                    IOUtils.TryDeleteIfExists(current.tempFolder);
+                    Task.Run(async () => { await IOUtils.TryDeleteIfExistsAsync(current.tempFolder); });
                 }
             }
 
@@ -266,7 +266,7 @@ namespace Flowframes
                 Logger.Log("Deleting temporary files...");
             try
             {
-                Directory.Delete(current.tempFolder, true);
+                await Task.Run(async () => { Directory.Delete(current.tempFolder, true); });
             }
             catch (Exception e)
             {

Code/Main/InterpolateSteps.cs

@@ -58,7 +58,7 @@ namespace Flowframes.Main
             // if (Config.GetBool("scnDetect") && !current.inputIsFrames)        // Input is video - extract frames first
             //     await ExtractSceneChanges();
 
-            if (!IOUtils.TryDeleteIfExists(current.framesFolder))
+            if (!(await IOUtils.TryDeleteIfExistsAsync(current.framesFolder)))
             {
                 InterpolateUtils.ShowMessage("Failed to delete existing frames folder - Make sure no file is opened in another program!", "Error");
                 return;
@@ -81,7 +81,7 @@ namespace Flowframes.Main
                 InterpolateUtils.ShowMessage("There are no extracted frames that can be interpolated!\nDid you run the extraction step?", "Error");
                 return;
             }
-            if (!IOUtils.TryDeleteIfExists(current.interpFolder))
+            if (!(await IOUtils.TryDeleteIfExistsAsync(current.interpFolder)))
             {
                 InterpolateUtils.ShowMessage("Failed to delete existing frames folder - Make sure no file is opened in another program!", "Error");
                 return;

Code/Media/FfmpegAlpha.cs

@@ -46,7 +46,7 @@ namespace Flowframes.Media
             await RunFfmpeg(args, LogMode.Hidden);
 
             if (deleteAlphaDir)
-                IOUtils.TryDeleteIfExists(alphaDir);
+                await IOUtils.TryDeleteIfExistsAsync(alphaDir);
         }
     }
 }

Code/Media/FfmpegAudioAndMetadata.cs

@@ -48,7 +48,7 @@ namespace Flowframes.Media
                     if (IOUtils.GetFilesize(outPath) < 512)
                     {
                         Logger.Log($"Failed to extract audio stream #{track.streamIndex}, even with re-encoding. Will be missing from output.");
-                        IOUtils.TryDeleteIfExists(outPath);
+                        await IOUtils.TryDeleteIfExistsAsync(outPath);
                         return;
                     }
 
@@ -120,7 +120,7 @@ namespace Flowframes.Media
                     }
                     else
                     {
-                        IOUtils.TryDeleteIfExists(outPath);     // Delete if encode was not successful
+                        await IOUtils.TryDeleteIfExistsAsync(outPath);     // Delete if encode was not successful
                     }
                 }
 
@@ -313,28 +313,6 @@ namespace Flowframes.Media
 
             await RunFfmpeg(args, tempFolder, LogMode.Hidden);
 
-
-            // if (File.Exists(outPath) && IOUtils.GetFilesize(outPath) < 1024)
-            // {
-            //     Logger.Log("Failed to merge audio losslessly! Trying to re-encode.", false, false, "ffmpeg");
-            // 
-            //     args = $" -i {inName} -stream_loop {looptimes} -i {audioName.Wrap()}" +
-            //     $"{trackInputArgs} -map 0:v -map 1:a {trackMapArgs} -c:v copy {Utils.GetAudioFallbackArgs(Path.GetExtension(inputFile))} -c:s {subCodec} {trackMetaArgs} -shortest {outName}";
-            // 
-            //     await RunFfmpeg(args, tempFolder, LogMode.Hidden);
-            // 
-            //     if (File.Exists(outPath) && IOUtils.GetFilesize(outPath) < 1024)
-            //     {
-            //         Logger.Log("Failed to merge audio, even with re-encoding. Output will not have audio.", false, false, "ffmpeg");
-            //         IOUtils.TryMove(tempPath, inputFile);   // Move temp file back
-            //         IOUtils.TryDeleteIfExists(tempPath);
-            //         return;
-            //     }
-            // 
-            //     string audioExt = Path.GetExtension(audioPath).Remove(".").ToUpper();
-            //     Logger.Log($"Source audio ({audioExt}) has been re-encoded to fit into the target container ({containerExt.Remove(".").ToUpper()}). This may decrease the quality slightly.", false, true, "ffmpeg");
-            // }
-
             if (File.Exists(outPath) && IOUtils.GetFilesize(outPath) > 512)
             {
                 File.Delete(tempPath);

Code/OS/AiProcess.cs

@@ -291,7 +291,7 @@ namespace Flowframes
                     string lastInterpPath = outPath + $"-run{iteration - 1}";
                     Directory.Move(outPath, lastInterpPath);      // Rename last interp folder
                     await RunRifeNcnnProcess(lastInterpPath, outPath, mdl);
-                    IOUtils.TryDeleteIfExists(lastInterpPath);
+                    await IOUtils.TryDeleteIfExistsAsync(lastInterpPath);
                 }
                 else
                 {