hugo-snap-gallery/layouts/shortcodes/snap-gallery.html

{{/*  Count number of gallery on page  */}}
{{- $.Page.Scratch.Add "gallerycount" 1 -}}
{{ $galno := $.Page.Scratch.Get "gallerycount" }}

{{/*  Initialise variables holding image paths  */}}
{{ $imgs := slice }}

{{/*  Get/sanitise image paths  */}}
{{ if .Params.isdir }}
  {{/*  Get images from folder, put into map  */}}
  {{ $imgdir := print "/static/" .Params.src }}
  {{- range readDir $imgdir -}}
  {{ $imgs = $imgs | append (print $.Params.src "/" .Name ) }}
  {{ end }}
{{ else }}
  {{/*  Get images from src Param, separated by comma  */}}
  {{ range (split .Params.src ",") }}
    {{ $imgs = $imgs | append (trim . " ") }}
  {{ end }}
{{ end }}

{{/*  Visible images  */}}
<div class="snap-wrapper" style="--columns:{{ default 4 .Params.columns }};--min-width:{{ default 200 .Params.minwidth }};">
{{ range $i, $img := $imgs }}
  <div class="snap-image">
    <img src="{{ $img }}" onclick="openModal({{ $galno }});currentSlide({{ $galno }}, {{ add $i 1 }});">
  </div>
{{ end }}
</div>

{{ partial "lightbox" (dict "galno" $galno "imgs" $imgs) }}

{{/*  Load CSS/JS and make sure it is only loaded once  */}}
{{- if eq ($.Page.Scratch.Get "gallerycount") 1 }}
{{- with resources.Get "scss/snap-gallery.scss" | toCSS }}
<link rel="stylesheet" href="{{ .RelPermalink }}" crossorigin="anonymous">
{{- end }}
<script src="/js/snap-gallery.js"></script>
{{ end }}