From 28b7691a59ea9788e10c4ca087c1ad063ee327fe Mon Sep 17 00:00:00 2001
From: Matthias Geier <Matthias.Geier@gmail.com>
Date: Thu, 11 Feb 2016 21:50:46 +0100
Subject: [PATCH] Check local links for all source suffixes

---
 nbsphinx.py | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/nbsphinx.py b/nbsphinx.py
index 4995e1d1..a88f8448 100644
--- a/nbsphinx.py
+++ b/nbsphinx.py
@@ -597,8 +597,15 @@ def apply(self):
                 continue  # Not a local link
             elif uri.startswith('#'):
                 continue  # Nothing to be done
-            elif uri.lower().endswith('.ipynb'):
-                target = uri[:-len('.ipynb')]
+
+            for suffix in env.config.source_suffix:
+                if uri.lower().endswith(suffix.lower()):
+                    target = uri[:-len(suffix)]
+                    break
+            else:
+                target = ''
+
+            if target:
                 target_ext = ''
                 reftype = 'doc'
                 refdomain = None