[SofaPython3/splib] Add a gentle deprecation message and info on how to find the SPLIB. (#191)

If someone do an import splib expecting to rely on the one in SofaPython3.
This will raise an exception telling how to find it.

Author: damienmarchal

CMakeLists.txt

@@ -183,6 +183,16 @@ SP3_add_python_package(
         Sofa/constants
 )
 
+## This is only to warn users that splib is now relocated in its own repository
+# it just contains a __init__.py rising an exception indicating to where to find the plugin.
+# If splib is available, then splib/__init__.py will be overriden by the one from the real splib.
+SP3_add_python_package(
+    SOURCE_DIRECTORY
+        ${CMAKE_CURRENT_SOURCE_DIR}/splib
+    TARGET_DIRECTORY
+        splib
+)
+
 sofa_create_package(
     PACKAGE_NAME ${PROJECT_NAME}
     PACKAGE_VERSION ${PROJECT_VERSION}

splib/__init__.py

@@ -0,0 +1,4 @@
+"""SPLIB is now relocated at: https://github.com/SofaDefrost/STLIB, please clone and install the plugin to use it"""
+raise Exception("SPLIB is now relocated at: https://github.com/SofaDefrost/STLIB, please clone and install the plugin to use it")
+
+