[mod] add a __common__ template that can't be selected but that provides a common place for shared templates.

What has been moved into this template :
* opensearch*.xml is always the same whatever the themes.
* the text inside */about.html

searx/templates/__common__/about.html

+<div{% if rtl %} dir="ltr"{% endif %}>
+    <h1>About <a href="{{ url_for('index') }}">searx</a></h1>
+
+    <p>Searx is a <a href="https://en.wikipedia.org/wiki/Metasearch_engine">metasearch engine</a>, aggregating the results of other <a href="{{ url_for('preferences') }}">search engines</a> while not storing information about its users.
+    </p>
+    <h2>Why use searx?</h2>
+    <ul>
+        <li>searx may not offer you as personalised results as Google, but it doesn't generate a profile about you</li>
+        <li>searx doesn't care about what you search for, never shares anything with a third party, and it can't be used to compromise you</li>
+        <li>searx is free software, the code is 100% open and you can help to make it better. See more on <a href="https://github.com/asciimoo/searx">github</a></li>
+    </ul>
+    <p>If you do care about privacy, want to be a conscious user, or otherwise believe
+    in digital freedom, make searx your default search engine or run it on your own server</p>
+
+<h2>Technical details - How does it work?</h2>
+
+<p>Searx is a <a href="https://en.wikipedia.org/wiki/Metasearch_engine">metasearch engine</a>,
+inspired by the <a href="https://beniz.github.io/seeks/">seeks project</a>.<br />
+It provides basic privacy by mixing your queries with searches on other platforms without storing search data. Queries are made using a POST request on every browser (except chrome*). Therefore they show up in neither our logs, nor your url history. In case of Chrome* users there is an exception, searx uses the search bar to perform GET requests.<br />
+Searx can be added to your browser's search bar; moreover, it can be set as the default search engine.
+</p>
+
+<h2>How can I make it my own?</h2>
+
+<p>Searx appreciates your concern regarding logs, so take the <a href="https://github.com/asciimoo/searx">code</a> and run it yourself! <br />Add your Searx to this <a href="https://github.com/asciimoo/searx/wiki/Searx-instances">list</a> to help other people reclaim their privacy and make the Internet freer!
+<br />The more decentralized the Internet is, the more freedom we have!</p>
+
+
+<h2>More about searx</h2>
+
+<ul>
+    <li><a href="https://github.com/asciimoo/searx">github</a></li>
+    <li><a href="https://www.ohloh.net/p/searx/">ohloh</a></li>
+    <li><a href="https://twitter.com/Searx_engine">twitter</a></li>
+    <li>IRC: #searx @ freenode (<a href="https://kiwiirc.com/client/irc.freenode.com/searx">webclient</a>)</li>
+    <li><a href="https://www.transifex.com/projects/p/searx/">transifex</a></li>
+</ul>
+
+
+<hr />
+
+<h2 id="faq">FAQ</h2>
+
+<h3>How to add to firefox?</h3>
+<p><a href="#" onclick="window.external.AddSearchProvider(window.location.protocol + '//' + window.location.host + '{{ url_for('opensearch') }}');">Install</a> searx as a search engine on any version of Firefox! (javascript required)</p>
+
+<h2 id="dev_faq">Developer FAQ</h2>
+
+<h3>New engines?</h3>
+<ul>
+    <li>Edit your <a href="https://raw.github.com/asciimoo/searx/master/searx/settings.yml">settings.yml</a></li>
+    <li>Create your custom engine module, check the <a href="https://github.com/asciimoo/searx/blob/master/examples/basic_engine.py">example engine</a></li>
+</ul>
+<p>Don't forget to restart searx after config edit!</p>
+
+<h3>Installation/WSGI support?</h3>
+<p>See the <a href="https://github.com/asciimoo/searx/wiki/Installation">installation and setup</a> wiki page</p>
+
+<h3>How to debug engines?</h3>
+<p><a href="{{ url_for('stats') }}">Stats page</a> contains some useful data about the engines used.</p>
+
+</div>

searx/templates/courgette/about.html

 {% extends 'courgette/base.html' %}
 {% block content %}
 {% include 'courgette/github_ribbon.html' %}
-<div class="row"{% if rtl %} dir="ltr"{% endif %}>
-    <h1>About <a href="{{ url_for('index') }}">searx</a></h1>
-
-    <p>Searx is a <a href="https://en.wikipedia.org/wiki/Metasearch_engine">metasearch engine</a>, aggregating the results of other <a href="{{ url_for('preferences') }}">search engines</a> while not storing information about its users.
-    </p>
-    <h2>Why use searx?</h2>
-    <ul>
-        <li>searx may not offer you as personalised results as Google, but it doesn't generate a profile about you</li>
-        <li>searx doesn't care about what you search for, never shares anything with a third party, and it can't be used to compromise you</li>
-        <li>searx is free software, the code is 100% open and you can help to make it better. See more on <a href="https://github.com/asciimoo/searx">github</a></li>
-    </ul>
-    <p>If you do care about privacy, want to be a conscious user, or otherwise believe
-    in digital freedom, make searx your default search engine or run it on your own server</p>
-
-<h2>Technical details - How does it work?</h2>
-
-<p>Searx is a <a href="https://en.wikipedia.org/wiki/Metasearch_engine">metasearch engine</a>,
-inspired by the <a href="https://beniz.github.io/seeks/">seeks project</a>.<br />
-It provides basic privacy by mixing your queries with searches on other platforms without storing search data. Queries are made using a POST request on every browser (except chrome*). Therefore they show up in neither our logs, nor your url history. In case of Chrome* users there is an exception, searx uses the search bar to perform GET requests.<br />
-Searx can be added to your browser's search bar; moreover, it can be set as the default search engine.
-</p>
-
-<h2>How can I make it my own?</h2>
-
-<p>Searx appreciates your concern regarding logs, so take the <a href="https://github.com/asciimoo/searx">code</a> and run it yourself! <br />Add your Searx to this <a href="https://github.com/asciimoo/searx/wiki/Searx-instances">list</a> to help other people reclaim their privacy and make the Internet freer!
-<br />The more decentralized the Internet, is the more freedom we have!</p>
-
-
-<h2>More about searx</h2>
-
-<ul>
-    <li><a href="https://github.com/asciimoo/searx">github</a></li>
-    <li><a href="https://www.ohloh.net/p/searx/">ohloh</a></li>
-    <li><a href="https://twitter.com/Searx_engine">twitter</a></li>
-    <li>IRC: #searx @ freenode (<a href="https://kiwiirc.com/client/irc.freenode.com/searx">webclient</a>)</li>
-    <li><a href="https://www.transifex.com/projects/p/searx/">transifex</a></li>
-</ul>
-
-
-<hr />
-
-<h2 id="faq">FAQ</h2>
-
-<h3>How to add to firefox?</h3>
-<p><a href="#" onclick="window.external.AddSearchProvider(window.location.protocol + '//' + window.location.host + '{{ url_for('opensearch') }}');">Install</a> searx as a search engine on any version of Firefox! (javascript required)</p>
-
-<h2 id="dev_faq">Developer FAQ</h2>
-
-<h3>New engines?</h3>
-<ul>
-    <li>Edit your <a href="https://raw.github.com/asciimoo/searx/master/searx/settings.yml">settings.yml</a></li>
-    <li>Create your custom engine module, check the <a href="https://github.com/asciimoo/searx/blob/master/examples/basic_engine.py">example engine</a></li>
-</ul>
-<p>Don't forget to restart searx after config edit!</p>
-
-<h3>Installation/WSGI support?</h3>
-<p>See the <a href="https://github.com/asciimoo/searx/wiki/Installation">installation and setup</a> wiki page</p>
-
-<h3>How to debug engines?</h3>
-<p><a href="{{ url_for('stats') }}">Stats page</a> contains some useful data about the engines used.</p>
-
-</div>
+{% include '__common__/about.html' %}
 {% endblock %}

searx/templates/courgette/opensearch.xml

-<?xml version="1.0" encoding="utf-8"?>
-<OpenSearchDescription xmlns="http://a9.com/-/spec/opensearch/1.1/">
-  <ShortName>{{ instance_name }}</ShortName>
-  <Description>a privacy-respecting, hackable metasearch engine</Description>
-  <InputEncoding>UTF-8</InputEncoding>
-  <Image>{{ urljoin(host, url_for('static', filename='img/favicon.png')) }}</Image>
-  <LongName>searx metasearch</LongName>
-  {% if opensearch_method == 'get' %}
-    <Url type="text/html" method="get" template="{{ host }}search?q={searchTerms}"/>
-    {% if autocomplete %}
-    <Url type="application/x-suggestions+json" method="get" template="{{ host }}autocompleter">
-        <Param name="format" value="x-suggestions" />
-        <Param name="q" value="{searchTerms}" />
-    </Url>
-    {% endif %}
-  {% else %}
-    <Url type="text/html" method="post" template="{{ host }}">
-        <Param name="q" value="{searchTerms}" />
-    </Url>
-    {% if autocomplete %}
-    <!-- TODO, POST REQUEST doesn't work -->
-    <Url type="application/x-suggestions+json" method="get" template="{{ host }}autocompleter">
-        <Param name="format" value="x-suggestions" />
-        <Param name="q" value="{searchTerms}" />
-    </Url>
-    {% endif %}
-  {% endif %}
-</OpenSearchDescription>

searx/templates/courgette/opensearch_response_rss.xml

-<?xml version="1.0" encoding="UTF-8"?>
-<rss version="2.0"
-     xmlns:opensearch="http://a9.com/-/spec/opensearch/1.1/"
-     xmlns:atom="http://www.w3.org/2005/Atom">
-  <channel>
-    <title>Searx search: {{ q|e }}</title>
-    <link>{{ base_url }}?q={{ q|e }}</link>
-    <description>Search results for "{{ q|e }}" - searx</description>
-    <opensearch:totalResults>{{ number_of_results }}</opensearch:totalResults>
-    <opensearch:startIndex>1</opensearch:startIndex>
-    <opensearch:itemsPerPage>{{ number_of_results }}</opensearch:itemsPerPage>
-    <atom:link rel="search" type="application/opensearchdescription+xml" href="{{ base_url }}opensearch.xml"/>
-    <opensearch:Query role="request" searchTerms="{{ q|e }}" startPage="1" />
-    {% for r in results %}
-    <item>
-      <title>{{ r.title }}</title>
-      <link>{{ r.url }}</link>
-      <description>{{ r.content }}</description>
-      {% if r.pubdate %}<pubDate>{{ r.pubdate }}</pubDate>{% endif %}
-    </item>
-    {% endfor %}
-  </channel>
-</rss>

searx/templates/legacy/about.html

 {% extends 'legacy/base.html' %}
 {% block content %}
 {% include 'legacy/github_ribbon.html' %}
-<div class="row"{% if rtl %} dir="ltr"{% endif %}>
-    <h1>About <a href="{{ url_for('index') }}">searx</a></h1>
-
-    <p>Searx is a <a href="https://en.wikipedia.org/wiki/Metasearch_engine">metasearch engine</a>, aggregating the results of other <a href="{{ url_for('preferences') }}">search engines</a> while not storing information about its users.
-    </p>
-    <h2>Why use searx?</h2>
-    <ul>
-        <li>searx may not offer you as personalised results as Google, but it doesn't generate a profile about you</li>
-        <li>searx doesn't care about what you search for, never shares anything with a third party, and it can't be used to compromise you</li>
-        <li>searx is free software, the code is 100% open and you can help to make it better. See more on <a href="https://github.com/asciimoo/searx">github</a></li>
-    </ul>
-    <p>If you do care about privacy, want to be a conscious user, or otherwise believe
-    in digital freedom, make searx your default search engine or run it on your own server</p>
-
-<h2>Technical details - How does it work?</h2>
-
-<p>Searx is a <a href="https://en.wikipedia.org/wiki/Metasearch_engine">metasearch engine</a>,
-inspired by the <a href="https://beniz.github.io/seeks/">seeks project</a>.<br />
-It provides basic privacy by mixing your queries with searches on other platforms without storing search data. Queries are made using a POST request on every browser (except chrome*). Therefore they show up in neither our logs, nor your url history. In case of Chrome* users there is an exception, if searx used from the search bar it performs GET requests.<br />
-Searx can be added to your browser's search bar; moreover, it can be set as the default search engine.
-</p>
-
-<h2>How can I make it my own?</h2>
-
-<p>Searx appreciates your concern regarding logs, so take the <a href="https://github.com/asciimoo/searx">code</a> and run it yourself! <br />Add your Searx to this <a href="https://github.com/asciimoo/searx/wiki/Searx-instances">list</a> to help other people reclaim their privacy and make the Internet freer!
-<br />The more decentralized Internet is the more freedom we have!</p>
-
-
-<h2>More about searx</h2>
-
-<ul>
-    <li><a href="https://github.com/asciimoo/searx">github</a></li>
-    <li><a href="https://www.ohloh.net/p/searx/">ohloh</a></li>
-    <li><a href="https://twitter.com/Searx_engine">twitter</a></li>
-    <li>IRC: #searx @ freenode (<a href="https://kiwiirc.com/client/irc.freenode.com/searx">webclient</a>)</li>
-    <li><a href="https://www.transifex.com/projects/p/searx/">transifex</a></li>
-</ul>
-
-
-<hr />
-
-<h2 id="faq">FAQ</h2>
-
-<h3>How to add to firefox?</h3>
-<p><a href="#" onclick="window.external.AddSearchProvider(window.location.protocol + '//' + window.location.host + '{{ url_for('opensearch') }}');">Install</a> searx as a search engine on any version of Firefox! (javascript required)</p>
-
-<h2 id="dev_faq">Developer FAQ</h2>
-
-<h3>New engines?</h3>
-<ul>
-    <li>Edit your <a href="https://raw.github.com/asciimoo/searx/master/searx/settings.yml">settings.yml</a></li>
-    <li>Create your custom engine module, check the <a href="https://github.com/asciimoo/searx/blob/master/examples/basic_engine.py">example engine</a></li>
-</ul>
-<p>Don't forget to restart searx after config edit!</p>
-
-<h3>Installation/WSGI support?</h3>
-<p>See the <a href="https://github.com/asciimoo/searx/wiki/Installation">installation and setup</a> wiki page</p>
-
-<h3>How to debug engines?</h3>
-<p><a href="{{ url_for('stats') }}">Stats page</a> contains some useful data about the engines used.</p>
-
-</div>
+{% include '__common__/about.html' %}
 {% endblock %}

searx/templates/legacy/opensearch.xml

-<?xml version="1.0" encoding="utf-8"?>
-<OpenSearchDescription xmlns="http://a9.com/-/spec/opensearch/1.1/">
-  <ShortName>{{ instance_name }}</ShortName>
-  <Description>a privacy-respecting, hackable metasearch engine</Description>
-  <InputEncoding>UTF-8</InputEncoding>
-  <Image>{{ urljoin(host, url_for('static', filename='img/favicon.png')) }}</Image>
-  <LongName>searx metasearch</LongName>
-  {% if opensearch_method == 'get' %}
-    <Url type="text/html" method="get" template="{{ host }}search?q={searchTerms}"/>
-    {% if autocomplete %}
-    <Url type="application/x-suggestions+json" method="get" template="{{ host }}autocompleter">
-        <Param name="format" value="x-suggestions" />
-        <Param name="q" value="{searchTerms}" />
-    </Url>
-    {% endif %}
-  {% else %}
-    <Url type="text/html" method="post" template="{{ host }}">
-        <Param name="q" value="{searchTerms}" />
-    </Url>
-    {% if autocomplete %}
-    <!-- TODO, POST REQUEST doesn't work -->
-    <Url type="application/x-suggestions+json" method="get" template="{{ host }}autocompleter">
-        <Param name="format" value="x-suggestions" />
-        <Param name="q" value="{searchTerms}" />
-    </Url>
-    {% endif %}
-  {% endif %}
-</OpenSearchDescription>

searx/templates/legacy/opensearch_response_rss.xml

-<?xml version="1.0" encoding="UTF-8"?>
-<rss version="2.0"
-     xmlns:opensearch="http://a9.com/-/spec/opensearch/1.1/"
-     xmlns:atom="http://www.w3.org/2005/Atom">
-  <channel>
-    <title>Searx search: {{ q|e }}</title>
-    <link>{{ base_url }}?q={{ q|e }}</link>
-    <description>Search results for "{{ q|e }}" - searx</description>
-    <opensearch:totalResults>{{ number_of_results }}</opensearch:totalResults>
-    <opensearch:startIndex>1</opensearch:startIndex>
-    <opensearch:itemsPerPage>{{ number_of_results }}</opensearch:itemsPerPage>
-    <atom:link rel="search" type="application/opensearchdescription+xml" href="{{ base_url }}opensearch.xml"/>
-    <opensearch:Query role="request" searchTerms="{{ q|e }}" startPage="1" />
-    {% for r in results %}
-    <item>
-      <title>{{ r.title }}</title>
-      <link>{{ r.url }}</link>
-      <description>{{ r.content }}</description>
-      {% if r.pubdate %}<pubDate>{{ r.pubdate }}</pubDate>{% endif %}
-    </item>
-    {% endfor %}
-  </channel>
-</rss>

searx/templates/oscar/about.html

 {% extends "oscar/base.html" %}
 {% block title %}{{ _('about') }} - {% endblock %}
 {% block content %}
-<div{% if rtl %} dir="ltr"{% endif %}>
-    <h1>About <a href="{{ url_for('index') }}">searx</a></h1>
-
-    <p>Searx is a <a href="https://en.wikipedia.org/wiki/Metasearch_engine">metasearch engine</a>, aggregating the results of other <a href="{{ url_for('preferences') }}">search engines</a> while not storing information about its users.
-    </p>
-    <h2>Why use searx?</h2>
-    <ul>
-        <li>searx may not offer you as personalised results as Google, but it doesn't generate a profile about you</li>
-        <li>searx doesn't care about what you search for, never shares anything with a third party, and it can't be used to compromise you</li>
-        <li>searx is free software, the code is 100% open and you can help to make it better. See more on <a href="https://github.com/asciimoo/searx">github</a></li>
-    </ul>
-    <p>If you do care about privacy, want to be a conscious user, or otherwise believe
-    in digital freedom, make searx your default search engine or run it on your own server</p>
-
-<h2>Technical details - How does it work?</h2>
-
-<p>Searx is a <a href="https://en.wikipedia.org/wiki/Metasearch_engine">metasearch engine</a>,
-inspired by the <a href="https://beniz.github.io/seeks/">seeks project</a>.<br />
-It provides basic privacy by mixing your queries with searches on other platforms without storing search data. Queries are made using a POST request on every browser (except chrome*). Therefore they show up in neither our logs, nor your url history. In case of Chrome* users there is an exception, searx uses the search bar to perform GET requests.<br />
-Searx can be added to your browser's search bar; moreover, it can be set as the default search engine.
-</p>
-
-<h2>How can I make it my own?</h2>
-
-<p>Searx appreciates your concern regarding logs, so take the <a href="https://github.com/asciimoo/searx">code</a> and run it yourself! <br />Add your Searx to this <a href="https://github.com/asciimoo/searx/wiki/Searx-instances">list</a> to help other people reclaim their privacy and make the Internet freer!
-<br />The more decentralized the Internet is, the more freedom we have!</p>
-
-
-<h2>More about searx</h2>
-
-<ul>
-    <li><a href="https://github.com/asciimoo/searx">github</a></li>
-    <li><a href="https://www.ohloh.net/p/searx/">ohloh</a></li>
-    <li><a href="https://twitter.com/Searx_engine">twitter</a></li>
-    <li>IRC: #searx @ freenode (<a href="https://kiwiirc.com/client/irc.freenode.com/searx">webclient</a>)</li>
-    <li><a href="https://www.transifex.com/projects/p/searx/">transifex</a></li>
-</ul>
-
-
-<hr />
-
-<h2 id="faq">FAQ</h2>
-
-<h3>How to add to firefox?</h3>
-<p><a href="#" onclick="window.external.AddSearchProvider(window.location.protocol + '//' + window.location.host + '{{ url_for('opensearch') }}');">Install</a> searx as a search engine on any version of Firefox! (javascript required)</p>
-
-<h2 id="dev_faq">Developer FAQ</h2>
-
-<h3>New engines?</h3>
-<ul>
-    <li>Edit your <a href="https://raw.github.com/asciimoo/searx/master/searx/settings.yml">settings.yml</a></li>
-    <li>Create your custom engine module, check the <a href="https://github.com/asciimoo/searx/blob/master/examples/basic_engine.py">example engine</a></li>
-</ul>
-<p>Don't forget to restart searx after config edit!</p>
-
-<h3>Installation/WSGI support?</h3>
-<p>See the <a href="https://github.com/asciimoo/searx/wiki/Installation">installation and setup</a> wiki page</p>
-
-<h3>How to debug engines?</h3>
-<p><a href="{{ url_for('stats') }}">Stats page</a> contains some useful data about the engines used.</p>
-
-</div>
+{% include '__common__/about.html' %}
 {% endblock %}

searx/templates/pix-art/about.html

 {% extends 'pix-art/base.html' %}
 {% block content %}
-<div class="row"{% if rtl %} dir="ltr"{% endif %}>
-    <h1>About <a href="{{ url_for('index') }}">searx</a></h1>
-
-    <p>Searx is a <a href="https://en.wikipedia.org/wiki/Metasearch_engine">metasearch engine</a>, aggregating the results of other <a href="{{ url_for('preferences') }}">search engines</a> while not storing information about its users.
-    </p>
-    <h2>Why use searx?</h2>
-    <ul>
-        <li>searx may not offer you as personalised results as Google, but it doesn't generate a profile about you</li>
-        <li>searx doesn't care about what you search for, never shares anything with a third party, and it can't be used to compromise you</li>
-        <li>searx is free software, the code is 100% open and you can help to make it better. See more on <a href="https://github.com/asciimoo/searx">github</a></li>
-    </ul>
-    <p>If you do care about privacy, want to be a conscious user, or otherwise believe
-    in digital freedom, make searx your default search engine or run it on your own server</p>
-
-<h2>Technical details - How does it work?</h2>
-
-<p>Searx is a <a href="https://en.wikipedia.org/wiki/Metasearch_engine">metasearch engine</a>,
-inspired by the <a href="https://beniz.github.io/seeks/">seeks project</a>.<br />
-It provides basic privacy by mixing your queries with searches on other platforms without storing search data. Queries are made using a POST request on every browser (except chrome*). Therefore they show up in neither our logs, nor your url history. In case of Chrome* users there is an exception, if searx used from the search bar it performs GET requests.<br />
-Searx can be added to your browser's search bar; moreover, it can be set as the default search engine.
-</p>
-
-<h2>How can I make it my own?</h2>
-
-<p>Searx appreciates your concern regarding logs, so take the <a href="https://github.com/asciimoo/searx">code</a> and run it yourself! <br />Add your Searx to this <a href="https://github.com/asciimoo/searx/wiki/Searx-instances">list</a> to help other people reclaim their privacy and make the Internet freer!
-<br />The more decentralized Internet is the more freedom we have!</p>
-
-
-<h2>More about searx</h2>
-
-<ul>
-    <li><a href="https://github.com/asciimoo/searx">github</a></li>
-    <li><a href="https://www.ohloh.net/p/searx/">ohloh</a></li>
-    <li><a href="https://twitter.com/Searx_engine">twitter</a></li>
-    <li>IRC: #searx @ freenode (<a href="https://kiwiirc.com/client/irc.freenode.com/searx">webclient</a>)</li>
-    <li><a href="https://www.transifex.com/projects/p/searx/">transifex</a></li>
-</ul>
-
-
-<hr />
-
-<h2 id="faq">FAQ</h2>
-
-<h3>How to add to firefox?</h3>
-<p><a href="#" onclick="window.external.AddSearchProvider(window.location.protocol + '//' + window.location.host + '{{ url_for('opensearch') }}');">Install</a> searx as a search engine on any version of Firefox! (javascript required)</p>
-
-<h2 id="dev_faq">Developer FAQ</h2>
-
-<h3>New engines?</h3>
-<ul>
-    <li>Edit your <a href="https://raw.github.com/asciimoo/searx/master/searx/settings.yml">settings.yml</a></li>
-    <li>Create your custom engine module, check the <a href="https://github.com/asciimoo/searx/blob/master/examples/basic_engine.py">example engine</a></li>
-</ul>
-<p>Don't forget to restart searx after config edit!</p>
-
-<h3>Installation/WSGI support?</h3>
-<p>See the <a href="https://github.com/asciimoo/searx/wiki/Installation">installation and setup</a> wiki page</p>
-
-<h3>How to debug engines?</h3>
-<p><a href="{{ url_for('stats') }}">Stats page</a> contains some useful data about the engines used.</p>
-
-</div>
+{% include '__common__/about.html' %}
 {% endblock %}

searx/utils.py

     templates_path = os.path.join(root, 'templates')
 
     themes = os.listdir(os.path.join(static_path, 'themes'))
+    if '__common__' in themes:
+        themes.remove('__common__')
     return static_path, templates_path, themes
 
 

searx/webapp.py

     2. cookies
     3. settings"""
 
-    if override and override in themes:
+    if override and (override in themes or override == '__common__'):
         return override
     theme_name = request.args.get('theme', request.preferences.get_value('theme'))
     if theme_name not in themes:
             results=results,
             q=request.form['q'],
             number_of_results=number_of_results,
-            base_url=get_base_url()
+            base_url=get_base_url(),
+            override_theme='__common__',
         )
         return Response(response_rss, mimetype='text/xml')
 
     ret = render('opensearch.xml',
                  opensearch_method=method,
                  host=get_base_url(),
-                 urljoin=urljoin)
+                 urljoin=urljoin,
+                 override_theme='__common__')
 
     resp = Response(response=ret,
                     status=200,

tests/unit/test_webapp.py

         Search.search = search_mock
 
         def get_current_theme_name_mock(override=None):
+            if override:
+                return override
             return 'legacy'
 
         webapp.get_current_theme_name = get_current_theme_name_mock