From 84867166ec13d75c07809813588344054095d128 Mon Sep 17 00:00:00 2001
From: Julien Palard <julien@palard.fr>
Date: Sat, 13 Jul 2019 16:46:56 +0200
Subject: [PATCH] [3.5] Doc: Add an optional obsolete header. (GH-13638).
 (#13658)

* [3.5] Doc: Add an optional obsolete header. (GH-13638).
(cherry picked from commit 46ed90dd014010703c7a3b2a61c4927644fa8210)

Co-authored-by: Julien Palard <julien@palard.fr>
---
 Doc/README.txt                  |  9 +++++++++
 Doc/tools/templates/layout.html | 11 +++++++++++
 2 files changed, 20 insertions(+)

diff --git a/Doc/README.txt b/Doc/README.txt
index 4f8e9f8f14..f245d6164f 100644
--- a/Doc/README.txt
+++ b/Doc/README.txt
@@ -104,6 +104,15 @@ Then, from the ``Doc`` directory, run ::
 where ``<builder>`` is one of html, text, latex, or htmlhelp (for explanations
 see the make targets above).
 
+Deprecation header
+==================
+
+You can define the ``outdated`` variable in ``html_context`` to show a
+red banner on each page redirecting to the "latest" version.
+
+The link points to the same page on ``/3/``, sadly for the moment the
+language is lost during the process.
+
 
 Contributing
 ============
diff --git a/Doc/tools/templates/layout.html b/Doc/tools/templates/layout.html
index c2106678ac..7a7feb52e1 100644
--- a/Doc/tools/templates/layout.html
+++ b/Doc/tools/templates/layout.html
@@ -1,4 +1,15 @@
 {% extends "!layout.html" %}
+
+{% block header %}
+{%- if outdated %}
+<div id="outdated-warning" style="padding: .5em; text-align: center; background-color: #FFBABA; color: #6A0E0E;">
+    {% trans %}This document is for an old version of Python that is no longer supported.
+    You should upgrade, and read the {% endtrans %}
+    <a href="/3/{{ pagename }}{{ file_suffix }}">{% trans %} Python documentation for the current stable release{% endtrans %}</a>.
+</div>
+{%- endif %}
+{% endblock %}
+
 {% block rootrellink %}
         <li><img src="{{ pathto('_static/py.png', 1) }}" alt=""
                  style="vertical-align: middle; margin-top: -1px"/></li>
-- 
2.40.0