{{ $author := index .Site.Data.authors ((or .Params.author .Site.Author.default.footer) | default "default") }}

<footer>
  {{- with .Site.Author.footer -}}
    {{ if $.IsHome -}}
      {{ . | markdownify }}
    {{- else -}}
      {{ $author.blogtitle }}
    {{- end -}}
  {{- end }}
  | Copyright &copy; {{ now.Format "2006"}}
</footer>