texture stitcher (literally psd layers but im lazy)

TextureStitcher/TextureStitcherAutoRegen.cs

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+using UnityEditor;
+using UnityEngine;
+using System.Linq;
+
+namespace gay.lilyy.TextureStitcher
+{
+  public class TextureStitcherAutoRegen : AssetPostprocessor
+  {
+    private const string MenuPath = "LillithRosePup/Import Regens/Texture Stitcher";
+    private const string PrefKey = "TextureStitcher.AutoRegen";
+
+    [MenuItem(MenuPath)]
+    private static void Toggle()
+    {
+      bool enabled = !EditorPrefs.GetBool(PrefKey, true);
+      EditorPrefs.SetBool(PrefKey, enabled);
+      Menu.SetChecked(MenuPath, enabled);
+    }
+
+    [MenuItem(MenuPath, true)]
+    private static bool ToggleValidate()
+    {
+      Menu.SetChecked(MenuPath, EditorPrefs.GetBool(PrefKey, true));
+      return true;
+    }
+
+    private static bool IsEnabled()
+    {
+      return EditorPrefs.GetBool(PrefKey, true);
+    }
+    static void OnPostprocessAllAssets(
+        string[] importedAssets,
+        string[] deletedAssets,
+        string[] movedAssets,
+        string[] movedFromAssetPaths)
+    {
+      if (!IsEnabled())
+        return;
+
+      if (importedAssets.Length == 0)
+        return;
+
+      var stitchers = AssetDatabase
+          .FindAssets("t:TextureStitcherSettings")
+          .Select(guid =>
+              AssetDatabase.LoadAssetAtPath<TextureStitcherSettings>(
+                  AssetDatabase.GUIDToAssetPath(guid)))
+          .Where(s => s && s.textures != null && s.textures.Length > 0)
+          .ToArray();
+
+      if (stitchers.Length == 0)
+        return;
+
+      foreach (string path in importedAssets)
+      {
+        var tex = AssetDatabase.LoadAssetAtPath<Texture2D>(path);
+        if (!tex) continue;
+
+        foreach (var stitcher in stitchers)
+        {
+          if (stitcher.textures.Contains(tex))
+            TextureStitcherEditor.GenerateStitchedTexture(stitcher);
+        }
+      }
+    }
+  }
+}