{#
Creates all the markup required for an custom key/value input. These are usually
used to let the user provide custom meta data. Each "field" has three inputs
one for the key, one for the value and a checkbox to remove it. So the arguments
for this macro are nearly all tuples containing values for the
(key, value, delete) fields respectively.

names       - A tuple of names for the three fields.
values      - A tuple of values for the (key, value, delete) fields. If delete
is truthy the checkbox will be checked.
error       - A list of error strings for the field or just true to highlight the field.
is_required - Boolean of whether this input is required for the form to validate

Examples:

{% import 'macros/form.html' as form %}
{{ form.custom(
names=('custom_key', 'custom_value', 'custom_deleted'),
id='field-custom',
label=_('Custom Field'),
values=(extra.key, extra.value, extra.deleted),
error=''
) }}
#}
{% macro custom(names=(), id="", label="", values=(), placeholders=(), error="", classes=[], attrs={}, is_required=false, key_values=()) %}

{%- set extra_html = caller() if caller -%}

    {{ ui.extra_field(extra_html, data={"key": values[0], "value": values[1], "deleted": values[2]}, errors=error, name_template=names[0][:-3]) }}

{% endmacro %}