Enhance Cursor instance management

Improve the handling of multiple Cursor instances by implementing better workspace detection and reuse of existing windows.

Editor/ProcessRunner.cs

@@ -8,6 +8,13 @@ using System.Diagnostics;
 using System.Text;
 using System.Threading;
 using System.Threading.Tasks;
+using System.Runtime.InteropServices;
+using System.ComponentModel;
+using Debug = UnityEngine.Debug;
+using System.IO;
+using SimpleJSON;
+using System.Collections.Generic;
+using System.Linq;
 
 namespace Microsoft.Unity.VisualStudio.Editor
 {
@@ -108,5 +115,85 @@ namespace Microsoft.Unity.VisualStudio.Editor
 
 			sb?.Append(data);
 		}
+
+		public static string[] GetProcessWorkspaces(Process process)
+		{
+			if (process == null)
+				return null;
+
+			try
+			{
+				var workspaces = new List<string>();
+				var userProfile = Environment.GetFolderPath(Environment.SpecialFolder.UserProfile);
+				var cursorStoragePath = Path.Combine(userProfile, "AppData", "Roaming", "cursor", "User", "workspaceStorage");
+				
+				if (Directory.Exists(cursorStoragePath))
+				{
+					foreach (var workspaceDir in Directory.GetDirectories(cursorStoragePath))
+					{
+						try
+						{
+							var workspaceStatePath = Path.Combine(workspaceDir, "workspace.json");
+							if (File.Exists(workspaceStatePath))
+							{
+								var content = File.ReadAllText(workspaceStatePath);
+								if (!string.IsNullOrEmpty(content))
+								{
+									var workspace = JSONNode.Parse(content);
+									if (workspace != null)
+									{
+										var folder = workspace["folder"];
+										if (folder != null && !string.IsNullOrEmpty(folder.Value))
+										{
+											var workspacePath = folder.Value;
+											if (workspacePath.StartsWith("file:///"))
+											{
+												workspacePath = Uri.UnescapeDataString(workspacePath.Substring(8));
+												workspaces.Add(workspacePath);
+											}
+										}
+									}
+								}
+							}
+
+							var windowStatePath = Path.Combine(workspaceDir, "window.json");
+							if (File.Exists(windowStatePath))
+							{
+								var content = File.ReadAllText(windowStatePath);
+								if (!string.IsNullOrEmpty(content))
+								{
+									var windowState = JSONNode.Parse(content);
+									if (windowState != null)
+									{
+										var workspace = windowState["workspace"];
+										if (workspace != null && !string.IsNullOrEmpty(workspace.Value))
+										{
+											var workspacePath = workspace.Value;
+											if (workspacePath.StartsWith("file:///"))
+											{
+												workspacePath = Uri.UnescapeDataString(workspacePath.Substring(8));
+												workspaces.Add(workspacePath);
+											}
+										}
+									}
+								}
+							}
+						}
+						catch (Exception ex)
+						{
+							Debug.LogWarning($"[Cursor] Error reading workspace state file: {ex.Message}");
+							continue;
+						}
+					}
+				}
+
+				return workspaces.Distinct().ToArray();
+			}
+			catch (Exception ex)
+			{
+				Debug.LogError($"[Cursor] Error getting workspace directory: {ex.Message}");
+				return null;
+			}
+		}
 	}
 }

Editor/VisualStudioCursorInstallation.cs

@@ -12,6 +12,7 @@ using System.Text.RegularExpressions;
 using UnityEngine;
 using SimpleJSON;
 using IOPath = System.IO.Path;
+using Debug = UnityEngine.Debug;
 
 namespace Microsoft.Unity.VisualStudio.Editor {
 	internal class VisualStudioCursorInstallation : VisualStudioInstallation {
@@ -448,6 +449,36 @@ namespace Microsoft.Unity.VisualStudio.Editor {
 			}
 		}
 
+		private Process FindRunningCursorWithSolution(string solutionPath) {
+			var directory = IOPath.GetDirectoryName(solutionPath);
+			var processes = Process.GetProcessesByName("cursor");
+			
+			var normalizedTargetPath = directory.Replace('\\', '/').TrimEnd('/').ToLowerInvariant();
+			
+			foreach (var process in processes) {
+				try {
+					var workspaces = ProcessRunner.GetProcessWorkspaces(process);
+					if (workspaces != null && workspaces.Length > 0) {
+						foreach (var workspace in workspaces) {
+							var normalizedWorkspaceDir = workspace.Replace('\\', '/').TrimEnd('/').ToLowerInvariant();
+
+							if (string.Equals(normalizedWorkspaceDir, normalizedTargetPath, StringComparison.OrdinalIgnoreCase) ||
+								normalizedTargetPath.StartsWith(normalizedWorkspaceDir + "/", StringComparison.OrdinalIgnoreCase) ||
+								normalizedWorkspaceDir.StartsWith(normalizedTargetPath + "/", StringComparison.OrdinalIgnoreCase))
+							{
+								return process;
+							}
+						}
+					}
+				}
+				catch (Exception ex) {
+					Debug.LogError($"[Cursor] Error checking process: {ex}");
+					continue;
+				}
+			}
+			return null;
+		}
+
 		public override bool Open(string path, int line, int column, string solution) {
 			line = Math.Max(1, line);
 			column = Math.Max(0, column);
@@ -455,10 +486,26 @@ namespace Microsoft.Unity.VisualStudio.Editor {
 			var directory = IOPath.GetDirectoryName(solution);
 			var application = Path;
 
-			ProcessRunner.Start(string.IsNullOrEmpty(path) ?
-				ProcessStartInfoFor(application, $"\"{directory}\"") :
-				ProcessStartInfoFor(application, $"\"{directory}\" -g \"{path}\":{line}:{column}"));
+			var existingProcess = FindRunningCursorWithSolution(directory);
+			if (existingProcess != null) {
+				try {
+					var args = string.IsNullOrEmpty(path) ? 
+						$"--reuse-window \"{directory}\"" : 
+						$"--reuse-window -g \"{path}\":{line}:{column}";
+					
+					ProcessRunner.Start(ProcessStartInfoFor(application, args));
+					return true;
+				}
+				catch (Exception ex) {
+					Debug.LogError($"[Cursor] Error using existing instance: {ex}");
+				}
+			}
 
+			var newArgs = string.IsNullOrEmpty(path) ?
+				$"--new-window \"{directory}\"" :
+				$"--new-window -g \"{path}\":{line}:{column}";
+			
+			ProcessRunner.Start(ProcessStartInfoFor(application, newArgs));
 			return true;
 		}