lightweight variant

CursorLang.Agent/Services/SettingsLauncher.cs

@@ -0,0 +1,43 @@
+using System.ComponentModel;
+using System.Diagnostics;
+using CursorLang.Core.Services;
+
+namespace CursorLang.Agent.Services;
+
+/// <summary>
+/// Starts the settings window.
+/// </summary>
+/// <remarks>
+/// The agent does not keep track of whether the window is already open, and does not
+/// need to: the settings process guards a single-instance slot of its own, so a second
+/// launch raises the window already there and exits. That costs a process start to find
+/// out, which is a fraction of the time it takes a person to look at the tray, and it
+/// saves the agent from holding a handle to something it does not own.
+/// </remarks>
+internal static class SettingsLauncher
+{
+    /// <summary>
+    /// Opens the settings window. Returns <c>false</c> when the executable is not
+    /// where it should be — a half-copied installation, or the agent run from a build
+    /// folder of its own.
+    /// </summary>
+    internal static bool Open()
+    {
+        if (AgentExecutable.SettingsPath is not { } path)
+        {
+            return false;
+        }
+
+        try
+        {
+            using Process? started = Process.Start(new ProcessStartInfo(path) { UseShellExecute = false });
+            return started is not null;
+        }
+        catch (Exception e) when (e is Win32Exception or InvalidOperationException)
+        {
+            // Nothing to tell the user with: the agent has no window of its own, and
+            // the one that would have shown the message is the one that failed to start
+            return false;
+        }
+    }
+}