refactor file creation for a project parent

src/SharpIDE.Application/Features/FileWatching/IdeFileOperationsService.cs

@@ -26,13 +26,20 @@ public class IdeFileOperationsService(SharpIdeSolutionModificationService sharpI
 		await _sharpIdeSolutionModificationService.RemoveFile(file);
 	}
 
-	public async Task CreateCsFile(SharpIdeFolder parentFolder, string newFileName)
+	public async Task CreateCsFile(IFolderOrProject parentNode, string newFileName)
 	{
-		var newFilePath = Path.Combine(parentFolder.Path, newFileName);
+		var newFilePath = Path.Combine(GetFileParentNodePath(parentNode), newFileName);
 		var className = Path.GetFileNameWithoutExtension(newFileName);
-		var @namespace = NewFileTemplates.ComputeNamespace(parentFolder);
+		var @namespace = NewFileTemplates.ComputeNamespace(parentNode);
 		var fileText = NewFileTemplates.CsharpClass(className, @namespace);
 		await File.WriteAllTextAsync(newFilePath, fileText);
-		await _sharpIdeSolutionModificationService.CreateFile(parentFolder, newFileName, fileText);
+		await _sharpIdeSolutionModificationService.CreateFile(parentNode, newFilePath, newFileName, fileText);
 	}
+
+	private static string GetFileParentNodePath(IFolderOrProject parentNode) => parentNode switch
+	{
+		SharpIdeFolder folder => folder.Path,
+		SharpIdeProjectModel project => Path.GetDirectoryName(project.FilePath)!,
+		_ => throw new InvalidOperationException("Parent node must be a folder or project")
+	};
 }

src/SharpIDE.Application/Features/FileWatching/NewFileTemplates.cs

@@ -18,7 +18,7 @@ public static class NewFileTemplates
 		return text;
 	}
 
-	public static string ComputeNamespace(SharpIdeFolder folder)
+	public static string ComputeNamespace(IFolderOrProject folder)
 	{
 		var names = new List<string>();
 		IFolderOrProject? current = folder;

src/SharpIDE.Application/Features/FileWatching/SharpIdeSolutionModificationService.cs

@@ -60,11 +60,10 @@ public class SharpIdeSolutionModificationService(FileChangedService fileChangedS
 		}
 	}
 
-	public async Task CreateFile(SharpIdeFolder parentFolder, string fileName, string contents)
+	public async Task CreateFile(IFolderOrProject parentNode, string newFilePath, string fileName, string contents)
 	{
-		var newFilePath = Path.Combine(parentFolder.Path, fileName);
+		var sharpIdeFile = new SharpIdeFile(newFilePath, fileName, parentNode, []);
-		var sharpIdeFile = new SharpIdeFile(newFilePath, fileName, parentFolder, []);
+		parentNode.Files.Add(sharpIdeFile);
-		parentFolder.Files.Add(sharpIdeFile);
 		SolutionModel.AllFiles.Add(sharpIdeFile);
 		await _fileChangedService.SharpIdeFileAdded(sharpIdeFile, contents);
 	}

src/SharpIDE.Godot/Features/SolutionExplorer/ContextMenus/Dialogs/NewCsharpFileDialog.cs

@@ -1,6 +1,7 @@
 using Godot;
 using SharpIDE.Application.Features.FileWatching;
 using SharpIDE.Application.Features.SolutionDiscovery;
+using SharpIDE.Application.Features.SolutionDiscovery.VsPersistence;
 
 namespace SharpIDE.Godot.Features.SolutionExplorer.ContextMenus.Dialogs;
 
@@ -9,7 +10,7 @@ public partial class NewCsharpFileDialog : ConfirmationDialog
     private LineEdit _nameLineEdit = null!;
     private ItemList _fileTypeItemList = null!;
 
-    public SharpIdeFolder ParentFolder { get; set; } = null!;
+    public IFolderOrProject ParentNode { get; set; } = null!;
 
     [Inject] private readonly IdeFileOperationsService _ideFileOperationsService = null!;
     
@@ -72,7 +73,7 @@ public partial class NewCsharpFileDialog : ConfirmationDialog
 
         _ = Task.GodotRun(async () =>
         {
-           await _ideFileOperationsService.CreateCsFile(ParentFolder, fileName);
+           await _ideFileOperationsService.CreateCsFile(ParentNode, fileName);
         });
         QueueFree();
     }

src/SharpIDE.Godot/Features/SolutionExplorer/ContextMenus/FolderContextMenu.cs

@@ -89,7 +89,7 @@ public partial class SolutionExplorerPanel
         else if (actionId is CreateNewSubmenuOptions.CSharpFile)
         {
             var newCsharpFileDialog = _newCsharpFileDialogScene.Instantiate<NewCsharpFileDialog>();
-            newCsharpFileDialog.ParentFolder = folder;
+            newCsharpFileDialog.ParentNode = folder;
             AddChild(newCsharpFileDialog);
             newCsharpFileDialog.PopupCentered();
         }