From 643f962d8fcebbc44a7e47113e07c53d50c424ff Mon Sep 17 00:00:00 2001
From: Jakub Svoboda <132791205+rolledhand@users.noreply.github.com>
Date: Sun, 31 May 2026 20:04:34 +0200
Subject: [PATCH] Houdini 20.5: expose MoonRay Sdr Python stubs

Signed-off-by: Jakub Svoboda <132791205+rolledhand@users.noreply.github.com>
---
 CMakeLists.txt                        |  4 ++++
 moonrayShaderDiscovery/CMakeLists.txt |  3 +++
 moonrayShaderParser/CMakeLists.txt    |  3 +++
 sitecustomize.py                      | 19 +++++++++++++++++++
 4 files changed, 29 insertions(+)
 create mode 100644 sitecustomize.py

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2af290a..961c5ba 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -20,3 +20,7 @@ find_package(Python REQUIRED COMPONENTS Development)
 
 add_subdirectory(moonrayShaderDiscovery)
 add_subdirectory(moonrayShaderParser)
+
+install(FILES ${CMAKE_CURRENT_SOURCE_DIR}/sitecustomize.py
+        DESTINATION lib/python
+)
diff --git a/moonrayShaderDiscovery/CMakeLists.txt b/moonrayShaderDiscovery/CMakeLists.txt
index b262d79..91d4e57 100644
--- a/moonrayShaderDiscovery/CMakeLists.txt
+++ b/moonrayShaderDiscovery/CMakeLists.txt
@@ -72,3 +72,6 @@ install(FILES ${plugInfoFile}
         DESTINATION plugin/pxr/moonrayShaderDiscovery
 )
 
+install(FILES ${CMAKE_CURRENT_SOURCE_DIR}/__init__.py
+        DESTINATION lib/python/pxr/MoonrayShaderDiscovery
+)
diff --git a/moonrayShaderParser/CMakeLists.txt b/moonrayShaderParser/CMakeLists.txt
index a5a2365..709a2f8 100644
--- a/moonrayShaderParser/CMakeLists.txt
+++ b/moonrayShaderParser/CMakeLists.txt
@@ -72,4 +72,7 @@ install(FILES ${plugInfoFile}
         DESTINATION plugin/pxr/moonrayShaderParser
 )
 
+install(FILES ${CMAKE_CURRENT_SOURCE_DIR}/__init__.py
+        DESTINATION lib/python/pxr/MoonrayShaderParser
+)
 
diff --git a/sitecustomize.py b/sitecustomize.py
new file mode 100644
index 0000000..538df21
--- /dev/null
+++ b/sitecustomize.py
@@ -0,0 +1,19 @@
+"""Expose MoonRay's USD Python plugin stubs to Houdini's pxr package.
+
+Houdini ships pxr as a regular Python package instead of a namespace package, so
+adding MoonRay's lib/python directory to PYTHONPATH is not enough for imports
+such as pxr.MoonrayShaderParser.  The Sdr plugins are native USD plugins; these
+small Python stubs only prevent Plug from reporting missing Python modules when
+the native parser/discovery plugins are loaded.
+"""
+
+import os
+
+try:
+    import pxr
+
+    moonray_pxr_path = os.path.join(os.path.dirname(__file__), "pxr")
+    if hasattr(pxr, "__path__") and moonray_pxr_path not in pxr.__path__:
+        pxr.__path__.append(moonray_pxr_path)
+except Exception:
+    pass