hugo-book-theme/layouts/partials/docs/shared.html

{{/*These templates contains some more complex logic and shared between partials*/}}
{{ define "title" }}
  {{- if .Pages -}}
    {{ $sections := split (trim .Dir "/") "/" }}
    {{ $title := index ($sections | last 1) 0 | humanize | title }}
    {{- default $title .Title -}}
  {{- else -}}
    {{ $title :=  .File | humanize | title }}
    {{- default $title .Title -}}
  {{- end -}}
{{ end }}

{{ define "hrefhack" }}
  {{ $attrEq := "$=" }}
  {{ $attrVal := .RelPermalink }}
  {{ if eq .RelPermalink "/" }}
    {{ $attrEq = "=" }}
    {{ $attrVal = .Permalink }}
  {{ end }}

  <style>
  nav ul a[href{{ $attrEq }}"{{ $attrVal }}"] {
      color: {{ default "#004ed0" .Site.Params.BookMenuBundleActiveLinkColor }};
  }
  </style>
{{ end }}