From 1f51fda2e80bef44bbc8f8373eebf055c8072dfe Mon Sep 17 00:00:00 2001
From: Martin Trigaux <mat@odoo.com>
Date: Tue, 10 Dec 2019 14:44:57 +0100
Subject: [PATCH] [IMP] _extension: add languages link

To refer the pages in different languages for better indexing
---
 _extensions/odoo/layout.html | 7 +++++++
 conf.py                      | 4 ++++
 2 files changed, 11 insertions(+)

diff --git a/_extensions/odoo/layout.html b/_extensions/odoo/layout.html
index d854af51f..5e47fb09a 100644
--- a/_extensions/odoo/layout.html
+++ b/_extensions/odoo/layout.html
@@ -18,6 +18,13 @@
   {{ super() }}
 {%- endblock -%}
 
+{%- block linktags -%}
+  {% for code, url in language_codes %}
+    <link rel="alternate" hreflang="{{ code }}" href="{{ url }}" />
+  {%- endfor %}
+  {{ super() }}
+{%- endblock -%}
+
 {%- block sidebar1 -%}{%- endblock -%}
 {%- block sidebar2 -%}{%- endblock -%}
 {%- block relbar1 -%}{%- endblock -%}
diff --git a/conf.py b/conf.py
index 914b3d576..f0ce00109 100644
--- a/conf.py
+++ b/conf.py
@@ -404,6 +404,10 @@ def localize(app, pagename, templatename, context, doctree):
         for la in app.config.languages.split(',')
         if la != current_lang
     ]
+    context['language_codes'] = [
+        (la.split('_')[0] if la != 'en' else 'x-default', _build_url(app.config.canonical_root, (la != 'en' and la or ''), pagename))
+        for la in app.config.languages.split(',')
+    ]
 
 
 def _build_url(root, branch, pagename):