{#
  nav_link: renders a menu <li><a> for the given endpoint.
#}
{% macro nav_link(endpoint, label) %}
<li><a class="dropdown-item" href="{{ url_for(endpoint) }}">{{ label }}</a></li>
{% endmacro %}

{#
  flashed_messages: the shared alert list. A macro rather than a block so the
  login page can render it inside its card -- a sign-in error banner at the
  top of the page sits 10em above the form it belongs to.
#}
{% macro flashed_messages() %}
{% with messages = get_flashed_messages(with_categories=True) %}
  {% if messages %}
    {% for category, message in messages %}
      {% set mapping = {'message': 'info', 'error': 'danger'} %}
      {% set variant = ' alert-' ~ mapping.get(category, category) if category else '' %}
      <div class="alert{{ variant }} alert-dismissible fade show">
        <button type="button" class="btn-close" data-bs-dismiss="alert" aria-label="Close"></button>
        {{ message }}
      </div>
    {% endfor %}
  {% endif %}
{% endwith %}
{% endmacro %}