| {# This extension of the 'layout.html' prevents documentation for previous | |
| versions of Astropy to be indexed by bots, e.g. googlebot or bing bot, | |
| by inserting a robots meta tag into pages that are not in the stable or | |
| latest branch. | |
| It assumes that the documentation is built by and hosted on readthedocs.org: | |
| 1. Readthedocs.org has a global robots.txt and no option for a custom one. | |
| 2. The readthedocs app passes additional variables to the template context, | |
| one of them being `version_slug`. This variable is a string computed from | |
| the tags of the branches that are selected to be built. It can be 'latest', | |
| 'stable' or even a unique stringified version number. | |
| For more information, please refer to: | |
| https://github.com/astropy/astropy/pull/7874 | |
| http://www.robotstxt.org/meta.html | |
| https://github.com/rtfd/readthedocs.org/blob/master/readthedocs/builds/version_slug.py | |
| #} | |
| {% extends "!layout.html" %} | |
| {%- block extrahead %} | |
| {% if not version_slug in to_be_indexed %} | |
| <meta name="robots" content="noindex, nofollow"> | |
| {% endif %} | |
| {{ super() }} | |
| {% endblock %} | |