{% macro form_group(field, attrs, data_widget=None) %} {# PURE #}
    {#
    `form-group` provides:
        - horizontal form support
        - margin-bottom
        - messages highlighting
        - correct fieldset layout
    #}
    {% set attrs = Attrs.take_prefixed(attrs, 'group-') %}
    {% do attrs.update({'class': attrs['class'] + 'form-group'}) %}
    {% if field.messages.error %}
        {% do attrs.update({'class': attrs['class'] + 'has-error'}) %}
    {% elif field.messages.success %}
        {% do attrs.update({'class': attrs['class'] + 'has-success'}) %}
    {% elif field.messages.warning %}
        {% do attrs.update({'class': attrs['class'] + 'has-warning'})%}
    {% elif field.messages.info %}
        {% do attrs.update({'class': attrs['class'] + 'has-info'}) %}
    {% endif %}
    {% if not widget.caption %}
        {% do attrs.update({'class': attrs['class'] + 'nocaption'}) %}
    {% endif %}
    {% do attrs.setdefault('data-name', field.fullname) %}
    {% do attrs.setdefault('data-widget', data_widget) %}
    {% do attrs.setdefault('id', 'group-' ~ field.fullname) %}
    <div {{ attrs }}>
        {{ caller() }}
    </div>
{% endmacro %}

{% macro prepend_append(prepend, append, attrs) %} {# PURE #}
    {% set prepend_attrs = Attrs.take_prefixed(attrs, 'prepend-') %}
    {% set append_attrs = Attrs.take_prefixed(attrs, 'append-') %}
    {% do prepend_attrs.update({'class': prepend_attrs['class'] + 'input-group-addon'}) %}
    {% do append_attrs.update({'class': append_attrs['class'] + 'input-group-addon'}) %}
    {% if prepend and append %}
        <div class="input-group input-group-prepend input-group-append">
            <span {{ prepend_attrs }}>{{ prepend }}</span>
            {{ caller() }}
            <span {{ append_attrs }}>{{ append }}</span>
        </div>
    {% elif prepend %}
        <div class="input-group input-group-prepend">
            <span {{ prepend_attrs }}>{{ prepend }}</span>
            {{ caller() }}
        </div>
    {% elif append %}
        <div class="input-group input-group-append">
            {{ caller() }}
            <span {{ append_attrs }}>{{ append }}</span>
        </div>
    {% else %}
        {{ caller() }}
    {% endif %}
{% endmacro %}

{% macro print_label(field, caption, description, tooltip, attrs) %} {# PURE #}
    {% set attrs = attrs.copy() %}
    {% do attrs.update({'class': attrs['class'] ~ ' control-label'}) %}
    {% do attrs.update({'for': attrs['for'] or field.fullname}) %}
    {% do attrs.update({'required': attrs['required'] if str(attrs['required']) else field.required() }) %}
    {% if caller %}
        <label {{ attrs }}>
            {{ caller() }} {{ caption or '&nbsp;' }}
            {%- if description -%}
                <span class="descr">{{ description }}</span>
            {%- endif -%}
            {%- if tooltip -%}
                <a href="#" data-toggle="tooltip" title="{{ tooltip }}"><i class="icon-tooltip fa fa-question-circle"></i></a>
            {%- endif -%}
        </label>
    {% else %}
        <label {{ attrs }}>{{ caption or '&nbsp;' }}
            {%- if description -%}
                <span class="descr">{{ description }}</span>
            {%- endif %}
            {%- if tooltip -%}
                <a href="#" data-toggle="tooltip" title="{{ tooltip }}"><i class="icon-tooltip fa fa-question-circle"></i></a>
            {%- endif -%}
        </label>
    {% endif %}
{% endmacro %}