Hooks #446
Description
I would like to propose adding hooks to Planet, such that logic can be executed before full planet build.
Example, I am building a theme where a user can just a provide a list of video URLs and tags in a page, and mark this page as a video directory. Then, on build, I would like my pre-processor to fetch the titles and thumbnails and build the static-filtering logic for per-tag filters on this page.
I can do this dynamically by processing with JS after page-load, but this is laggy and not SEO friendly, so I would prefer a full static build according to special rules pre-deployment, which is only possible with pre-build hooks.