This PR adds zoekt as a code search engine for forgejo. This Pull Request is a continuation of the discussion #8302.
The meilisearch search engine was not suitable, as it is not designed for searching by code. The zoekt project was proposed instead. Zoekt copes well with code indexing, but its operating principle differs from such search engines as elasticsearch.
While elasticsearch can return a result in a ready-made form (with pagination, ready-made snippets, etc.) and forgejo only needs to show this result in the interface with a little work with the data, zoekt works completely differently.
Zoekt finds matches in the repository index and returns a response. The response contains a line with the search word, its number from the file, and also a context, if specified in the request. This response is not suitable for Forgejo, so you need to assemble it yourself. To assemble the response from Zoekt into a form acceptable for Forgejo, I had to write some code and create a new function `searchZoektResult`, since the existing `searchResult` function is completely unsuitable for this search engine. I also had to write logic for pagination, highlighting, and correct display of lines in found snippets with a match, but this is a feature of Zoekt.
At the moment, Zoekt does not support deleting a repository index by repo_id, it only supports complete deletion of all repositories. But I still implemented the Delete function, which deletes a specific repository by its ID.
Co-authored-by: Aleksandr Gamzin <gamzin@altlinux.org>
Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/8827
Reviewed-by: Shiny Nematoda <snematoda@noreply.codeberg.org>
Reviewed-by: Gusted <gusted@noreply.codeberg.org>
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