Quick Twig macro for generating srcset-attribute for images

srcset.twig

{% macro img(file, base, caption="", sizes="100vw") %}
	{% set filename = file|split('.') %}
	{% set filenameext = "." ~ filename|last %}
	{% set file = file|replace({(filenameext): ""}) %}
	<img
		src="{{ base }}/{{ file }}-320{{ filenameext }}" 
		srcset="{{ base }}/{{ file }}-320{{ filenameext }} 320w,
		{{ base }}/{{ file }}-480{{ filenameext }} 480w,
		{{ base }}/{{ file }}-640{{ filenameext }} 640w,
		{{ base }}/{{ file }}-960{{ filenameext }} 960w,
		{{ base }}/{{ file }}-1280{{ filenameext }} 1280w,
		{{ base }}/{{ file }}-1600{{ filenameext }} 1600w,
		{{ base }}/{{ file }}-1920{{ filenameext }} 1920w,
		{{ base }}/{{ file }}-2240{{ filenameext }} 2240w" 
		sizes="{{ sizes }}" 
		alt="{{ caption }}" 
	/>
{% endmacro %}