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<!--
Usage:
figure "weird_cat.jpg" "Something that can (or not) be a cat."
figure src="weird_cat.jpg" alt="Something that can (or not) be a cat."
figure class="border" src="weird_cat.jpg" alt="Something that can (or not) be a cat."
figure "weird_cat.jpg" "Something that can (or not) be a cat." "border"
figure class="border" src="weird_cat.jpg" caption="Something that can (or not) be a cat." alt="Ask someone blind if a caption and alt text are the same thing."
Default available classes:
border
borderless
-->
{{ $file := .Get "src" | default (.Get 0) }}
{{ $caption := .Get "caption" | default (.Get 1) | markdownify }}
{{ $class := .Get "class" | default (.Get 2) }}
{{ $alt := .Get "alt" | default $caption }}
<!-- Image processing options -->
{{ $imageProc := (dict "highRes" (.Site.Params.imageProc.highRes | default .Site.Data.default.imageProc.highRes) "mediumRes" (.Site.Params.imageProc.mediumRes | default .Site.Data.default.imageProc.mediumRes) "lowRes" (.Site.Params.imageProc.lowRes | default .Site.Data.default.imageProc.lowRes)) }}
<!-- Default image path -->
{{ $imgPath := .Page.Param "imgPath" }}
{{ if $imgPath }}
{{ $file = path.Join $imgPath $file }}
{{ end }}
{{ with $.Page.Resources.GetMatch $file }}
<!--
HACK
Reduce reflow by generating a placeholder with similar size
-->
{{ $mediumRes := (index $imageProc.mediumRes 0) }}
{{ $encodedPlaceholder := (printf "data:image/png;base64,%s" (((resources.Get "img/pixel.gif").Resize (printf "%vx%v %s" (.Resize $mediumRes).Width (.Resize $mediumRes).Height "png")).Content | base64Encode)) | safeURL }}
{{ $outputSet := slice }}
{{ $inputFile := . }}
{{ range $imageProc }}
{{ $outputSet = $outputSet | append (printf "%s %s" (($inputFile.Resize (index . 0)).RelPermalink) (index . 1)) }}
{{ end }}
<figure>
<img
class="lazyload {{ $class }}"
loading="lazy"
data-srcset='{{ delimit $outputSet ", " }}'
src="{{ $encodedPlaceholder }}"
data-src="{{ (.Resize $mediumRes).RelPermalink }}"
{{ with $alt }}alt="{{ . }}"{{ end }}
/>
<noscript>
<img
{{ with $class }}class="{{ . }}"{{ end }}
loading="lazy"
srcset='{{ delimit $outputSet ", " }}'
src="{{ $encodedPlaceholder }}"
{{ with $alt }}alt="{{ . }}"{{ end }}
/>
</noscript>
{{ with $caption }}
<figcaption>{{ . }}</figcaption>
{{ end }}
</figure>
{{ end }}
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