{{- /* Given a "/static/..." image path, returns (dict "width" "height") read from the file, or an empty dict. */ -}}
{{- $result := dict -}}
{{- if and (eq (printf "%T" .) "string") (strings.HasPrefix . "/static/") -}}
  {{- $file := strings.TrimPrefix "/" . -}}
  {{- if and (fileExists $file) (not (strings.HasSuffix $file ".svg")) -}}
    {{- with images.Config $file -}}
      {{- $result = dict "width" .Width "height" .Height -}}
    {{- end -}}
  {{- end -}}
{{- end -}}
{{- return $result -}}