From eb62fb38a538cde41b1180ec182ba923455a49ee Mon Sep 17 00:00:00 2001
From: Spencer Fricke <115671160+spencer-lunarg@users.noreply.github.com>
Date: Thu, 12 Sep 2024 13:53:28 -0700
Subject: [PATCH] scripts: Better warning for getting reg.py

---
 scripts/generate_source.py | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/scripts/generate_source.py b/scripts/generate_source.py
index 941b021..ee9fc36 100755
--- a/scripts/generate_source.py
+++ b/scripts/generate_source.py
@@ -25,7 +25,13 @@ def RunGenerators(api: str, registry: str, targetFilter: str) -> None:
     scripts_directory_path = os.path.dirname(os.path.abspath(__file__))
     registry_headers_path = os.path.join(scripts_directory_path, scripts)
     sys.path.insert(0, registry_headers_path)
-    from reg import Registry
+    try:
+        from reg import Registry
+    except:
+        print("ModuleNotFoundError: No module named 'reg'") # normal python error message
+        print(f'{registry_headers_path} is not pointing to the Vulkan-Headers registry directory.')
+        print("Inside Vulkan-Headers there is a registry/reg.py file that is used.")
+        sys.exit(1) # Return without call stack so easy to spot error
 
     from generators.base_generator import BaseGeneratorOptions
     from generators.dispatch_table_generator import DispatchTableOutputGenerator