Method QueryEngine

src/query/queryengine.cpp:35–113

QueryEngine::QueryEngine(ExtensionRegistry &registry)
    : registry_(registry)
    , usage_scoring_(0,0,{})  // Null scoring, just to not have to implement constructors
{
    auto s = App::settings();

    auto decay = s->value(CFG_MEMORY_DECAY, DEF_MEMORY_DECAY).toDouble();
    auto prioritize_perfect_match = s->value(CFG_PRIO_PERFECT, DEF_PRIO_PERFECT).toBool();
    usage_scoring_ = UsageScoring(prioritize_perfect_match, decay,
                                  make_shared<unordered_map<ItemKey, double>>
                                  (UsageDatabase::instance().itemUsageScores(decay)));

    loadFallbackOrder();

    connect(&registry, &ExtensionRegistry::added, this, [this](Extension *e)
    {
        const auto id = e->id();
        auto settings = App::instance().settings();
        settings->beginGroup(id);

        if (auto *h = dynamic_cast<albert::QueryHandler*>(e))
        {
            auto t = settings->value(CFG_TRIGGER, h->defaultTrigger()).toString();
            auto f = settings->value(CFG_FUZZY, false).toBool();

            h->setTrigger(t);
            h->setFuzzyMatching(f);
            trigger_handlers_.emplace(piecewise_construct,
                                      forward_as_tuple(id),
                                      forward_as_tuple(h, t, f));
            emit queryHandlerAdded(h);

            updateActiveTriggers();
        }

        if (auto *h = dynamic_cast<albert::GlobalQueryHandler*>(e))
        {
            global_handlers_.emplace(id, h);
            if (settings->value(CFG_GLOBAL_HANDLER_ENABLED, true).toBool())
                global_query_.global_query_handlers.emplace(id, h);

            emit globalQueryHandlerAdded(h);
        }

        if (auto *h = dynamic_cast<albert::FallbackHandler*>(e))
        {
            fallback_handlers_.emplace(id, h);
            emit fallbackHandlerAdded(h);
        }
    });

    connect(&registry, &ExtensionRegistry::removed, this, [this](Extension *e)
    {
        const auto id = e->id();

        if (const auto it = trigger_handlers_.find(id); it != trigger_handlers_.end())
        {
            auto h = it->second.handler;