{{- $active := .Page.Eq .CurrentPage -}}
{{- $class := default "" .Class -}}
{{- if $active }}{{ $class = printf "%s active" $class }}{{ end -}}
<a href="{{ default .Page.RelPermalink .Page.Params.BookHref }}"{{ with $class }} class="{{ . }}"{{ end }}{{ if $active }} aria-current="page"{{ end }}{{ if .Page.Params.BookHref }} target="_blank" rel="noopener"{{ end }}>
  {{- if .Icon -}}
    {{- partial "docs/nav-icon" .Page -}}
    <span class="docs-nav-label">{{ default (partial "docs/title" .Page) .Title }}</span>
  {{- else -}}
    {{- default (partial "docs/title" .Page) .Title -}}
  {{- end -}}
</a>