site/layouts/shortcodes/blocks/tabs.html

{{- .Page.Scratch.Add "tabset-counter" 1 -}}
{{- $tab_set_id := .Get "name" | default (printf "tabset-%s-%d" (.Page.RelPermalink) (.Page.Scratch.Get "tabset-counter") ) | anchorize -}}
{{- $tabs := .Scratch.Get "tabs" -}}
{{- if .Inner -}}{{- /* We don't use the inner content, but Hugo will complain if we don't reference it. */ -}}{{- end -}}
<ul class="nav nav-tabs" id="{{ $tab_set_id }}" role="tablist">
	{{- range $i, $e := $tabs -}}
	  {{- $id := printf "%s-%d" $tab_set_id $i -}}
	  {{- if (eq $i 0) -}}
		<li class="nav-item"><a data-toggle="tab" class="nav-link active" href="#{{ $id }}" role="tab" aria-controls="{{ $id }}" aria-selected="true">{{- trim .name " " -}}</a></li>
	  {{ else }}
		<li class="nav-item"><a data-toggle="tab" class="nav-link" href="#{{ $id }}" role="tab" aria-controls="{{ $id }}">{{- trim .name " " -}}</a></li>
	  {{- end -}}
{{- end -}}
</ul>
<div class="tab-content" id="{{ $tab_set_id }}">
{{- range $i, $e := $tabs -}}
{{- $id := printf "%s-%d" $tab_set_id $i -}}
{{- if (eq $i 0) -}}
  <div id="{{ $id }}" class="tab-pane show active" role="tabpanel" aria-labelledby="{{ $id }}">
{{ else }}
  <div id="{{ $id }}" class="tab-pane" role="tabpanel" aria-labelledby="{{ $id }}">
{{ end }}
<p>
	{{- with .content -}}
		{{- . -}}
	{{- else -}}
		{{- if eq $.Page.BundleType "leaf" -}}
			{{- /* find the file somewhere inside the bundle. Note the use of double asterisk */ -}}
			{{- with $.Page.Resources.GetMatch (printf "**%s*" .include) -}}
				{{- if ne .ResourceType "page" -}}
				{{- /* Assume it is a file that needs code highlighting. */ -}}
				{{- $codelang := $e.codelang | default ( path.Ext .Name | strings.TrimPrefix ".") -}}
				{{- highlight .Content $codelang "" -}}
				{{- else -}}
					{{- .Content -}}
				{{- end -}}
			{{- end -}}
		{{- else -}}
		{{- $path := path.Join $.Page.File.Dir .include -}}
		{{- $page := site.GetPage "page" $path -}}
		{{- with $page -}}
			{{- .Content -}}
		{{- else -}}
		{{- errorf "[%s] tabs include not found for path %q" site.Language.Lang $path -}}
		{{- end -}}
		{{- end -}}
	{{- end -}}
</div>
{{- end -}}
</div>