preview update

list to preview.cs

@@ -0,0 +1,111 @@
+//
+// !-r "Eto.dll"
+// !-r "Rhino.UI.dll"
+
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using Rhino;
+using Eto.Forms;
+using Eto.Drawing;
+using Grasshopper;
+using Grasshopper.Kernel;
+
+public class GrasshopperFileLister
+{
+    public static void Run()
+    {
+        var folderDialog = new SelectFolderDialog();
+        if (folderDialog.ShowDialog(Rhino.UI.RhinoEtoApp.MainWindow) != DialogResult.Ok)
+        {
+            RhinoApp.WriteLine("No folder selected. Exiting script.");
+            return;
+        }
+        string folderPath = folderDialog.Directory;
+
+        var ghFiles = Directory.GetFiles(folderPath, "*.gh")
+                               .Concat(Directory.GetFiles(folderPath, "*.ghx"))
+                               .ToList();
+
+        if (ghFiles.Count == 0)
+        {
+            RhinoApp.WriteLine("No Grasshopper files (.gh, .ghx) found in the selected folder.");
+            return;
+        }
+
+        var etoForm = new EtoFileSelector(ghFiles);
+        etoForm.ShowModal(Rhino.UI.RhinoEtoApp.MainWindow);
+    }
+}
+
+public class EtoFileSelector : Dialog
+{
+    public EtoFileSelector(List<string> files)
+    {
+        Title = "Select a Grasshopper File";
+        Padding = new Padding(10);
+
+        var listBox = new ListBox();
+        files.ForEach(f => listBox.Items.Add(Path.GetFileName(f)));
+
+        var openButton = new Button { Text = "Open" };
+        openButton.Click += (sender, e) =>
+        {
+            if (listBox.SelectedIndex != -1)
+            {
+                string selectedFilePath = files[listBox.SelectedIndex];
+                OpenFile(selectedFilePath);
+                Close();
+            }
+            else
+            {
+                MessageBox.Show("Please select a file.", MessageBoxType.Information);
+            }
+        };
+
+        var cancelButton = new Button { Text = "Cancel" };
+        cancelButton.Click += (sender, e) =>
+        {
+            Close();
+        };
+
+        Content = new StackLayout
+        {
+            Spacing = 5,
+            Items =
+            {
+                new Label { Text = "Please select a file to open:" },
+                listBox,
+            }
+        };
+
+        PositiveButtons.Add(openButton);
+        NegativeButtons.Add(cancelButton);
+
+        DefaultButton = openButton;
+        AbortButton = cancelButton;
+    }
+
+private void OpenFile(string filePath)
+{
+    if (!File.Exists(filePath))
+    {
+        Rhino.RhinoApp.WriteLine($"File not found: {filePath}");
+        return;
+    }
+
+    // Load Grasshopper if not already running
+    Rhino.RhinoApp.RunScript("_Grasshopper _Load", false);
+
+    // Open the file via the command-line API, under the Document menu
+    string cmd = $"-_Grasshopper _Document _Open \"{filePath}\" _Enter";
+    Rhino.RhinoApp.RunScript(cmd, false);
+
+    Rhino.RhinoApp.WriteLine($"Opened: {Path.GetFileName(filePath)}");
+}
+
+}
+
+// To run this script in Rhino, you would typically call:
+GrasshopperFileLister.Run();