Use symlinks to create a modded copy

GCMM/MainUtils.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using System.Diagnostics;
 using System.Drawing;
 using System.IO;
@@ -29,39 +30,41 @@ namespace GCMM
 
         private bool EnableDisableAutoPatching(bool enable)
         {
-            string launcherConfig =
-                Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData),
-                    "Techblox Launcher", "launcher_settings.ini");
-            bool gamePathSet = false;
-            if (File.Exists(launcherConfig))
-            {
-                string[] lines = File.ReadLines(launcherConfig).Select(line =>
-                {
-                    if (line.StartsWith("133062..GAME_PATH=") && line.Contains('/'))
-                    {
-                        gamePathSet = true;
-                        return $"{line.Replace("/TBMM/", "/")}{(enable ? "TBMM/" : "")}";
-                    }
-
-                    return line;
-                }).ToArray(); //Need to close the file
-                File.WriteAllLines(launcherConfig, lines);
-            }
-
-            return gamePathSet;
-        } //TODO: Setting the game path might not be a good idea because of updates...
+            foreach (string file in Directory.EnumerateFiles(GamePath("")))
+                File.Copy(file, Path.GetFileName(file), true);
+            var toSymLink = new List<string> {GamePath("\\MonoBleedingEdge")};
+            Directory.CreateDirectory("TechbloxPreview_Data");
+            toSymLink.AddRange(Directory.EnumerateDirectories(GamePath("\\TechbloxPreview_Data"))
+                .Except(new[] {"Managed"}));
+            foreach (string file in Directory.EnumerateFiles(GamePath("\\TechbloxPreview_Data")))
+                File.Copy(file, "TechbloxPreview_Data\\" + Path.GetFileName(file), true);
+            Directory.CreateDirectory("TechbloxPreview_Data\\Managed");
+            foreach (string file in Directory.EnumerateFiles(GamePath("\\TechbloxPreview_Data\\Managed")))
+                File.Copy(file, "TechbloxPreview_Data\\Managed\\" + Path.GetFileName(file), true);
+            return toSymLink.Select(targetName => (sourceName: targetName.Replace(GamePath("\\"), ""), targetName))
+                .Where(tuple => !Directory.Exists(tuple.sourceName))
+                .All(tuple => SymLinks.CreateFolderSymbolicLink(tuple.sourceName, tuple.targetName));
+        }
 
         public void EnableDisableAutoPatchingWithDialog(bool enable)
         {
-            if (EnableDisableAutoPatching(enable))
+            try
             {
-                DialogUtils.ShowInfo(resources.GetString("Change_launch_settings_done"),
-                    resources.GetString("Change_launch_settings_title"));
-                Configuration.AutoPatch = enable ? AutoPatchingState.Enabled : AutoPatchingState.Disabled;
+                if (EnableDisableAutoPatching(enable))
+                {
+                    DialogUtils.ShowInfo(resources.GetString("Change_launch_settings_done"),
+                        resources.GetString("Change_launch_settings_title"));
+                    Configuration.AutoPatch = enable ? AutoPatchingState.Enabled : AutoPatchingState.Disabled;
+                }
+                else
+                    DialogUtils.ShowError(resources.GetString("Change_launch_settings_error"),
+                        resources.GetString("Change_launch_settings_title"));
             }
-            else
-                DialogUtils.ShowError(resources.GetString("Change_launch_settings_error"),
+            catch (Exception e)
+            {
+                DialogUtils.ShowError(resources.GetString("Change_launch_settings_error") + "\n\n" + e,
                     resources.GetString("Change_launch_settings_title"));
+            }
         }
 
         public string GetGameFolder()
@@ -72,7 +75,8 @@ namespace GCMM
             if (!File.Exists(launcherConfig)) return null;
             string path = File.ReadLines(launcherConfig)
                 .FirstOrDefault(line => line.StartsWith("133062..GAME_PATH="))
-                ?.Substring("133062..GAME_PATH=".Length).Replace("/TBMM/", "/") + "StandaloneWindows64";
+                ?.Substring("133062..GAME_PATH=".Length).Replace("/TBMM/", "/");
+            if (path != null) path = (path + "StandaloneWindows64").Replace('/', Path.DirectorySeparatorChar);
             if (path != null && GetExe(path) != null) return path;
             return null;
         }

GCMM/SymLinks.cs

@@ -0,0 +1,14 @@
+using System.Diagnostics;
+
+namespace GCMM
+{
+    public class SymLinks
+    {
+        public static bool CreateFolderSymbolicLink(string source, string target)
+        {
+            var proc = Process.Start(new ProcessStartInfo("cmd.exe", $"/c mklink /J \"{source}\" \"{target}\""));
+            proc?.WaitForExit();
+            return proc?.ExitCode == 0;
+        }
+    }
+}