Add file system watcher v1

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

@@ -0,0 +1,93 @@
+using FileWatcherEx;
+using Microsoft.Extensions.FileSystemGlobbing;
+using SharpIDE.Application.Features.SolutionDiscovery.VsPersistence;
+
+namespace SharpIDE.Application.Features.FileWatching;
+
+public sealed class IdeFileWatcher : IDisposable
+{
+	private Matcher? _matcher;
+	private FileSystemWatcherEx? _fileWatcher;
+	private SharpIdeSolutionModel? _solution;
+
+	public void StartWatching(SharpIdeSolutionModel solution)
+	{
+		_solution = solution;
+
+		var matcher = new Matcher();
+		//matcher.AddIncludePatterns(["**/*.cs", "**/*.csproj", "**/*.sln"]);
+		matcher.AddIncludePatterns(["**/*"]);
+		matcher.AddExcludePatterns(["**/bin", "**/obj", "**/node_modules", "**/.vs", "**/.git", "**/.idea", "**/.vscode"]);
+		_matcher = matcher;
+
+		var fileWatcher = new FileSystemWatcherEx();
+		fileWatcher.FolderPath = solution.DirectoryPath;
+		//fileWatcher.Filters.AddRange(["*"]);
+		fileWatcher.IncludeSubdirectories = true;
+		fileWatcher.NotifyFilter = NotifyFilters.LastWrite | NotifyFilters.FileName | NotifyFilters.DirectoryName;
+		fileWatcher.OnChanged += OnEvent;
+		fileWatcher.OnCreated += OnEvent;
+		fileWatcher.OnDeleted += OnEvent;
+		fileWatcher.OnRenamed += OnEvent;
+
+		fileWatcher.Start();
+		_fileWatcher = fileWatcher;
+	}
+
+	public void StopWatching()
+	{
+		if (_fileWatcher is not null)
+		{
+			_fileWatcher.Stop();
+			_fileWatcher.Dispose();
+			_fileWatcher = null!;
+		}
+	}
+
+	// TODO: Put events on a queue and process them in the background to avoid filling the buffer? FileSystemWatcherEx might already handle this
+	private void OnEvent(object? sender, FileChangedEvent e)
+	{
+		var matchResult = _matcher!.Match(_solution!.DirectoryPath, e.FullPath);
+		if (!matchResult.HasMatches) return;
+		switch (e.ChangeType)
+		{
+			case ChangeType.CHANGED: HandleChanged(e.FullPath); break;
+			case ChangeType.CREATED: HandleCreated(e.FullPath); break;
+			case ChangeType.DELETED: HandleDeleted(e.FullPath); break;
+			case ChangeType.RENAMED: HandleRenamed(e.OldFullPath, e.FullPath); break;
+			default: throw new ArgumentOutOfRangeException();
+		}
+	}
+
+	private void HandleRenamed(string? oldFullPath, string fullPath)
+	{
+
+		Console.WriteLine($"FileSystemWatcher: Renamed - {oldFullPath}, {fullPath}");
+	}
+
+	private void HandleDeleted(string fullPath)
+	{
+		Console.WriteLine($"FileSystemWatcher: Deleted - {fullPath}");
+	}
+
+	private void HandleCreated(string fullPath)
+	{
+		Console.WriteLine($"FileSystemWatcher: Created - {fullPath}");
+	}
+
+	// The only changed event we care about is files, not directories
+	// We will naively assume that if the file name does not have an extension, it's a directory
+	// This may not always be true, but it lets us avoid reading the file system to check
+	// TODO: Make a note to users that they should not use files without extensions
+	private void HandleChanged(string fullPath)
+	{
+		if (Path.HasExtension(fullPath) is false) return;
+		// TODO: Handle updating the content of open files in editors
+		Console.WriteLine($"FileSystemWatcher: Changed - {fullPath}");
+	}
+
+	public void Dispose()
+	{
+		StopWatching();
+	}
+}

src/SharpIDE.Application/Features/SolutionDiscovery/VsPersistence/SharpIdeModels.cs

@@ -34,6 +34,7 @@ public class SharpIdeSolutionModel : ISharpIdeNode, IExpandableSharpIdeNode
 {
 	public required string Name { get; set; }
 	public required string FilePath { get; set; }
+	public required string DirectoryPath { get; set; }
 	public required List<SharpIdeProjectModel> Projects { get; set; }
 	public required List<SharpIdeSolutionFolder> Folders { get; set; }
 	public required HashSet<SharpIdeProjectModel> AllProjects { get; set; }
@@ -48,6 +49,7 @@ public class SharpIdeSolutionModel : ISharpIdeNode, IExpandableSharpIdeNode
 		var allFiles = new ConcurrentBag<SharpIdeFile>();
 		Name = solutionName;
 		FilePath = solutionFilePath;
+		DirectoryPath = Path.GetDirectoryName(solutionFilePath)!;
 		Projects = intermediateModel.Projects.Select(s => new SharpIdeProjectModel(s, allProjects, allFiles, this)).ToList();
 		Folders = intermediateModel.SolutionFolders.Select(s => new SharpIdeSolutionFolder(s, allProjects, allFiles, this)).ToList();
 		AllProjects = allProjects.ToHashSet();

src/SharpIDE.Application/SharpIDE.Application.csproj

@@ -19,7 +19,9 @@
 
   <ItemGroup>
     <PackageReference Include="CliWrap" />
+    <PackageReference Include="FileWatcherEx" />
     <PackageReference Include="Microsoft.Diagnostics.NETCore.Client" PrivateAssets="all" />
+    <PackageReference Include="Microsoft.Extensions.FileSystemGlobbing" />
     <PackageReference Include="Microsoft.VisualStudio.Shared.VSCodeDebugProtocol" />
     <!-- If any Microsoft.Build.*.dll (Excluding Locator) ends up in the output, it will be prioritised for loading by MSBuild Nodes  -->
     <PackageReference Include="Ardalis.GuardClauses" />

src/SharpIDE.Godot/IdeRoot.cs

@@ -4,6 +4,8 @@ using Microsoft.Extensions.Hosting;
 using SharpIDE.Application.Features.Analysis;
 using SharpIDE.Application.Features.Build;
 using SharpIDE.Application.Features.Events;
+using SharpIDE.Application.Features.FileWatching;
+using SharpIDE.Application.Features.Run;
 using SharpIDE.Application.Features.SolutionDiscovery;
 using SharpIDE.Application.Features.SolutionDiscovery.VsPersistence;
 using SharpIDE.Godot.Features.BottomPanel;
@@ -39,6 +41,10 @@ public partial class IdeRoot : Control
 	{
 		GodotGlobalEvents.Instance = new GodotGlobalEvents();
 		GlobalEvents.Instance = new GlobalEvents();
+		Singletons.RunService = new RunService();
+		Singletons.BuildService = new BuildService();
+		Singletons.FileWatcher?.Dispose();
+		Singletons.FileWatcher = new IdeFileWatcher();
 	}
 
 	public override void _Ready()

src/SharpIDE.Godot/Singletons.cs

@@ -1,4 +1,5 @@
 using SharpIDE.Application.Features.Build;
+using SharpIDE.Application.Features.FileWatching;
 using SharpIDE.Application.Features.Run;
 using SharpIDE.Godot.Features.IdeSettings;
 
@@ -6,7 +7,8 @@ namespace SharpIDE.Godot;
 
 public static class Singletons
 {
-    public static RunService RunService { get; } = new RunService();
-    public static BuildService BuildService { get; } = new BuildService();
+    public static RunService RunService { get; set; } = null!;
+    public static BuildService BuildService { get; set; } = null!;
+    public static IdeFileWatcher FileWatcher { get; set; } = null!;
     public static AppState AppState { get; set; } = null!;
 }