This has been in the master branch of Nikola for a while but only now have I tried to fully integrate it, and polish all (most) of the rough edges.
By default, Nikola comes with support for search forms using Google and Duckduckgo. Some people disapprove of them for different reasons  so there was a request about supporting a standalone search engine.
The best of breed of those things seems to be Tipue so that's what I supported.
To use this, you need to enable a plugin, and do some configuration changes.
The plugin is called task_localsearch and you can find it in the Nikola source tree
Suppose your site is in a folder called mysite then to enable this plugin you need to create mysite/plugins and then copy task_localsearch.plugin and task_localsearch in there.
Then, in your site's conf.py find these options and change them accordingly:
How does it work? Here's a demo site for you to try!
|||My own reason for disapproving of duckduckgo site search? It finds nothing.|