Add home-manager search feature

[busti]

Home manager has several services and config options available at https://github.com/nix-community/home-manager/tree/master/modules which are similar to nixos configuration options.

Searching through these manually or using github search is rather tedious.
Using search.nixos.org to search through these feels like a natural extension of it's feature set.

[ysndr]

If I see correctly home manager expenses it's modules in it's flake definition.I'm working on flake support for nixos-search right now. After that it is a configuration issue I assume. blocked by: #324

[ysndr]

in the meantime you can find all options here: https://rycee.gitlab.io/home-manager/options.html

[SuperSandro2000]

The blocker got merged a while ago.

[pinpox]

The blocker got merged a while ago.

What needs to be done to get this working now?

[ncfavier]

Decide how to expose the options in home-manager (see nix-community/home-manager#2297 (comment)), and then reflect that in the nixos-search backend, probably also with a frontend change to separate HM options from NixOS options.

[ysndr]

We currently do not track flake options (iirc) but should be able to.
However merging them with the nixos optionswould be more of a ui challenge and homeManager (as well as nix-Darwin for that matter) is special as it introduces its own framework separate from a configuraton.nix (although able to integrate)

[ncfavier]

Did some work towards this in nix-community/home-manager#2971 (not solving the main problem).

[nixos-discourse]

This issue has been mentioned on NixOS Discourse. There might be relevant details there:

https://discourse.nixos.org/t/the-nix-module-in-home-manager-and-nixos/20999/11

[Asqiir]

Citing pinpox:

What needs to be done to get this working now?