{% macro nav(active_section) %}
    {% macro render_item(title, link) %}
        <a
            href="{{ url(link) }}"
            class="list-group-item list-group-item-action {% if active_section == link %}active{% endif %}"
        >
            {{ title }}
        </a>
    {% endmacro %}

    <div class="list-group list-group-flush">
        {{ render_item("Swap Content", "swap") }}
        {{ render_item("Form Validation", "form-validation") }}
        {{ render_item("Complex Form", "complex-form") }}
        {{ render_item("Filter List", "filter-list") }}
        {{ render_item("Table Inline Edit", "table-inline-edit") }}
        {{ render_item("Back to Home", "home") }}
    </div>
{% endmacro %}