GetBlockClass

{{- $class := "block" -}}

{{- $class = printf "%s block-%s" $class .template -}}

{{- if .title }}
  {{ $class = printf "%s block-titled" $class }}
{{- end -}}

{{- if .data.layout -}}
  {{- $class = printf "%s block-%s--%s" $class .template .data.layout -}}
{{- end -}}

{{- if .html_class -}}
  {{- $class = printf "%s %s" $class .html_class -}}
{{ end }}

{{- return $class -}}