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

{{- if not (eq .Title $.Site.Title) -}}
  {{- with or .Title .Summary -}}
    {{ . }} —
  {{ end }}
{{- end -}}

{{- with $.Site.Title -}}
  {{ if $.IsHome -}}
    {{ . }}
  {{- else -}}
    {{ $author.blogtitle }}
  {{- end -}}
{{- end -}}