PyRNA: all optional args now must be keyword args

In some cases the RNA API should be updated to make arguments use the
'required' flag, instead of adjusting Python scripts.

See T47811

1 files changed, 11 insertions, 0 deletions

diff --git a/source/blender/python/intern/bpy_rna.c b/source/blender/python/intern/bpy_rna.c
index 30bd3bc5ca3..9de9f6179d6 100644
--- a/source/blender/python/intern/bpy_rna.c
+++ b/source/blender/python/intern/bpy_rna.c
@@ -5654,6 +5654,17 @@ static PyObject *pyrna_func_call(BPy_FunctionRNA *self, PyObject *args, PyObject
 		item = NULL;
 
 		if (i < pyargs_len) {
+			/* New in 2.8x, optional arguments must be keywords.  */
+			if (UNLIKELY((flag_parameter & PARM_REQUIRED) == 0)) {
+				PyErr_Format(PyExc_TypeError,
+				             "%.200s.%.200s(): required parameter \"%.200s\" to be a keyword argument!",
+				             RNA_struct_identifier(self_ptr->type),
+				             RNA_function_identifier(self_func),
+				             RNA_property_identifier(parm));
+				err = -1;
+				break;
+			}
+
 			item = PyTuple_GET_ITEM(args, i);
 			kw_arg = false;
 		}