From 2f1b2ec1302a78f98a67bda8aee76baa96240330 Mon Sep 17 00:00:00 2001
From: Benjamin Bach <benjamin@readthedocs.org>
Date: Wed, 11 Jan 2023 17:18:03 +0100
Subject: [PATCH] Entirely remove "index.html" from canonical URL if the
 dirhtml builder was used

---
 sphinx_rtd_theme/layout.html | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/sphinx_rtd_theme/layout.html b/sphinx_rtd_theme/layout.html
index 9b00d0320..af8d59057 100644
--- a/sphinx_rtd_theme/layout.html
+++ b/sphinx_rtd_theme/layout.html
@@ -65,7 +65,10 @@
       Workaround for: https://github.com/sphinx-doc/sphinx/issues/9730
       Once a fix is released in Sphinx, put an upper bound on the Sphinx version for the workaround
     -#}
-    {%- if builder == 'dirhtml' and pageurl.endswith('.html') %}
+    {%- if builder == 'dirhtml' and pageurl.endswith('index.html') %}
+      {#- This expression trims away index.html entirely #}
+      <link rel="canonical" href="{{ (pageurl|e)[:-10] }}" />
+    {%- elif builder == 'dirhtml' and pageurl.endswith('.html') %}
       {#- This expression trims away .html and adds a / #}
       <link rel="canonical" href="{{ (pageurl|e)[:-5] }}/" />
     {%- else %}