maxtar.github.io/themes/hugo-geekdoc/layouts/shortcodes/img.html

{{- $source := ($.Page.Resources.ByType "image").GetMatch (printf "%s" (.Get "name")) }}
{{- $customAlt := .Get "alt" }}
{{- $customSize := .Get "size" | lower }}
{{- $lazyLoad := default (default true $.Site.Params.geekdocImageLazyLoading) (.Get "lazy") }}
{{- $data := newScratch }}

{{- with $source }}
  {{- $caption := default .Title $customAlt }}
  {{- $isSVG := (eq .MediaType.SubType "svg") }}
  {{- $origin := . }}

  {{- if $isSVG }}
    {{- $data.SetInMap "size" "tiny" "320" }}
    {{- $data.SetInMap "size" "small" "600" }}
    {{- $data.SetInMap "size" "medium" "1200" }}
    {{- $data.SetInMap "size" "large" "1800" }}
  {{- else }}
    {{- $data.SetInMap "size" "tiny" "320x"}}
    {{- $data.SetInMap "size" "small" "600x" }}
    {{- $data.SetInMap "size" "medium" "1200x" }}
    {{- $data.SetInMap "size" "large" "1800x" }}
  {{- end -}}

  <div class="flex justify-center">
    <figure class="gdoc-markdown__figure">
      <a class="gdoc-markdown__link--raw" href="{{ .Permalink }}">
        <picture>
          {{- $size := $data.Get "size" }}
          {{- if not $isSVG }}
            {{- if ne $customSize "origin" }}
            <source
              {{- if $customSize }}
                srcset="{{ ($origin.Resize (index $size $customSize)).Permalink }}"
              {{- else }}
                srcset="{{ ($origin.Resize (index $size "small")).Permalink }} 600w, {{ ($origin.Resize (index $size "medium")).Permalink }} 1200w" sizes="100vw"
              {{- end }}
            />
            {{- end }}
          {{- end }}
          <img
            {{- if $isSVG }}
              src="{{ $origin.Permalink }}" width="{{ index $size (default "medium" $customSize) }}"
            {{- else }}
              {{- if $lazyLoad }}{{ print " loading=\"lazy\"" | safeHTMLAttr }}{{- end }}
              {{- if eq $customSize "origin" }}
                src="{{ $origin.Permalink }}"
              {{- else }}
                src="{{ ($origin.Resize (index $size "large")).Permalink }}"
              {{- end }}
              alt="{{ $caption }}"
            {{- end }}
          />
        </picture>
      </a>
      {{- with $caption }}
        <figcaption>
          {{ . }}
          {{- with $source.Params.credits }}
            {{ printf " (%s)" . | $.Page.RenderString }}
          {{- end }}
        </figcaption>
      {{- end }}
    </figure>
  </div>
{{- end }}