wallabag-kindle-consumer/wallabag_kindle_consumer/templates/macros.html

{% macro input(id, label, type='text', description='', placeholder='', data={}, errors={}) %}
    <div class="form-group col-lg{% if id in errors %} is-invalid{% endif %}">
        <label for="{{ id }}">{{ label }}</label>
        <input name="{{ id }}" type="{{ type }}"
               class="form-control form-control-sm{% if id in errors %} is-invalid{% endif %}" id="{{ id }}"
               aria-describedby="{{ id }}Help" placeholder="{{ placeholder }}" value="{{ data[id]|default("") }}">
        <small id="{{ id }}Help" class="form-text text-muted">{{ description }}</small>
    </div>
{% endmacro %}

{% macro messages(errors, messages=[]) %}
    {% for msg in errors.values() %}
        <div class="alert alert-danger" role="alert">
            {{ msg }}
        </div>
    {% endfor %}
    {% for msg in messages %}
         <div class="alert alert-primary" role="alert">
            {{ msg }}
        </div>
    {% endfor %}
{% endmacro %}