usm-web/src/actions/SearchPackagesAction.vala

using Invercargill;
using Statum;

namespace UsmWeb {

    /**
     * Server-side search: filters the {@link PackagesState.SLOT_TYPE} PAGE
     * slot's package table by the `query` form field (case-insensitive
     * substring over name and summary).
     *
     * Collection-typed slot fields cannot be read back from held state, so
     * the filtered rows are rebuilt from the repository (the documented
     * rebuild-from-source pattern) and written as one slot update keyed by
     * the held slot's key.
     */
    public class SearchPackagesAction : StatumAction {

        protected RepositoryService repositories = Inversion.inject<RepositoryService>();
        protected UsmWebConfig config = Inversion.inject<UsmWebConfig>();
        protected Astralis.HttpContext http_context = Inversion.inject<Astralis.HttpContext>();

        public override async DirectiveBuilder handle() throws GLib.Error {
            string query = "";
            if (request.form != null) {
                query = (request.form.get_field("query") ?? "").strip();
            }

            HeldSlot held;
            if (!request.held.try_get(PackagesState.SLOT_TYPE, out held) || held == null) {
                return directives().error("No \"packages\" slot held — reload the page");
            }

            var base_uri = DerivedBase.derive(http_context.request, config);
            State state;
            try {
                state = PackagesState.build(repositories, config, action_registry, base_uri, query);
            } catch (Error e) {
                return directives().notify("error", @"Repository load failed: $(e.message)");
            }

            return directives().update(((!)held).key, state);
        }
    }
}