{
  lib,
  config,
  pkgs,
  ...
}:

lib.optionalAttrs (lib.elem "nvim::lsp::nix-nixd" config.machine.pkgs) {
  nixd = {
    cmd = [ "${pkgs.nixd}/bin/nixd" ];
    settings = {
      nixd = {
        on_init =
          _: # lua
          ''
            function(client)
              local path = client.workspace_folders[1].name

              if path == '/path/to/project1' then
                client.config.settings["rust-analyzer"].checkOnSave.overrideCommand = { "cargo", "check" }
                client.notify("workspace/didChangeConfiguration", { settings = client.config.settings })
              end

              return true
            end
          '';
        nixpkgs = {
          expr = ''import (builtins.getFlake ("git+file:///etc/nixos")).inputs.nixpkgs {}'';
        };
        formatting = {
          command = [ "${pkgs.nixfmt-rfc-style}/bin/nixfmt" ];
        };
        options = {
          nixos = {
            expr = ''(builtins.getFlake ("git+file:///etc/nixos")).outputs.nixosConfigurations.Lilim.options'';
          };
          # TODO: Find a good general expression for this.
          # home_manager = {
          #   expr =
          #     "'(builtins.getFlake (\"git+file://\" + toString ./.)).homeConfigurations.\"ruixi@k-on\".options'";
          # };
        };
      };
    };
  };
}