From ba5a970d2e51af2ad8681d79ba0725098c0bfcee Mon Sep 17 00:00:00 2001
From: Henrik Finsberg <henriknf@simula.no>
Date: Wed, 6 May 2026 16:56:01 +0200
Subject: [PATCH] Add dunction to list builtin backends

---
 src/io4dolfinx/backends/__init__.py | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/src/io4dolfinx/backends/__init__.py b/src/io4dolfinx/backends/__init__.py
index df08d7c..b27faf6 100644
--- a/src/io4dolfinx/backends/__init__.py
+++ b/src/io4dolfinx/backends/__init__.py
@@ -439,3 +439,22 @@ def get_backend(backend: str) -> IOBackend:
         return EXODUSInterface
     else:
         return import_module(backend)
+
+
+BUILTIN_BAKENDS = ("h5py", "adios2", "pyvista", "xdmf", "vtkhdf", "exodus")
+
+
+def list_builtin_backends() -> list[str]:
+    """List available builtin backends.
+
+    Returns:
+        List of available backends
+    """
+    lst = []
+    for backend in BUILTIN_BAKENDS:
+        try:
+            get_backend(backend)
+        except ImportError:
+            continue
+        lst.append(backend)
+    return lst