From e3f1bdaca1f5144563c4ceac45f10e4b0b5b7963 Mon Sep 17 00:00:00 2001
From: Erik B Knudsen <erik.knudsen@copenhagenatomics.com>
Date: Wed, 12 Oct 2022 19:30:38 +0200
Subject: [PATCH] enable mcpl from the python layer

if the source filename ends with mcpl use that
---
 openmc/source.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/openmc/source.py b/openmc/source.py
index 48e14f6f71..fdb2d5bc25 100644
--- a/openmc/source.py
+++ b/openmc/source.py
@@ -223,7 +223,10 @@ class Source:
         if self.particle != 'neutron':
             element.set("particle", self.particle)
         if self.file is not None:
-            element.set("file", self.file)
+            if (self.file.endswith('.mcpl')):
+              element.set("mcpl", self.file)
+            else:
+              element.set("file", self.file)
         if self.library is not None:
             element.set("library", self.library)
         if self.parameters is not None: