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{{/*
usage {{ partial "picture" (dict "img" XXX "class" XXX "widths" (slice 500 320, ...))}}
argument: a dictionary
"img": mandartory, image path
"class": the picture class if any
"widths": array of sizes if any
*/}}
{{- $img := index . "img" }}
{{- $imgName := index (split (path.Base $img) ".") 0 }}
{{- $imgBase := path.Join (path.Dir $img) $imgName }}
{{- $class := index . "class" }}
{{- $widths := index . "widths" }}
{{- $ext := path.Ext $img }}
<picture {{ if $class }}class="{{ $class }}"{{ end }}>
{{ if $widths }}
{{ $max := 0 }}
{{ range $widths }}
{{ if (gt . $max) }}
{{ $max := . }}
{{ end }}
<source srcset="{{ $imgBase }}-{{.}}.webp" type="image/webp" media="(max-width: {{.}}px)">
{{ end }}
<source srcset="{{ $imgBase }}.webp" type="image/webp" media="(min-width: {{ $max }}px)">
{{ else }}
<source srcset="{{ $imgBase }}.webp" type="image/webp">
{{ end }}
<source srcset="{{ $img }}">
<img src="{{ $img }}" alt="">
</picture>
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