{{ define "header" }}
  <header>
    {{- if .Description -}}
    <hgroup>
      <h1>{{ .Title }}</h1>
      <p>{{ .Description }}</p>
    </hgroup>
    {{- else -}}
    <h1>{{ .Title }}</h1>
    {{- end }}
  </header>
{{ end }}

{{ define "content" }}
  <section data-layout="docs">

    <nav aria-label="Notes" data-nav="sidebar">
      {{- $menuName := .Site.Params.notes_menu | default "notes" -}}
      {{- $menu := index .Site.Menus $menuName -}}
      {{- if $menu -}}
        {{- range $menu -}}
          {{- if .HasChildren -}}
          <h3>{{ .Name }}</h3>
          <ul>
            {{- range .Children -}}
            <li>
              <a href="{{ .URL }}"
                {{- if $.IsMenuCurrent $menuName . }} aria-current="page"{{ end -}}>
                {{- .Name -}}
              </a>
            </li>
            {{- end -}}
          </ul>
          {{- else -}}
          <ul>
            <li>
              <a href="{{ .URL }}"
                {{- if $.IsMenuCurrent $menuName . }} aria-current="page"{{ end -}}>
                {{- .Name -}}
              </a>
            </li>
          </ul>
          {{- end -}}
        {{- end -}}
      {{- else -}}
        {{- with .CurrentSection -}}
        <h3>{{ .Title }}</h3>
        <ul>
          {{- range .RegularPages -}}
          <li>
            <a href="{{ .RelPermalink }}"
               {{- if eq .RelPermalink $.RelPermalink }} aria-current="page"{{ end -}}>
              {{- .LinkTitle -}}
            </a>
          </li>
          {{- end -}}
        </ul>
        {{- end -}}
      {{- end -}}
    </nav>

    <article>
      {{ .Content }}

      {{- $prevURL := index .Params "prev-url" -}}
      {{- $prevTitle := index .Params "prev-title" -}}
      {{- $nextURL := index .Params "next-url" -}}
      {{- $nextTitle := index .Params "next-title" -}}
      {{- if or $prevURL $nextURL -}}
      <footer data-role="prev-next">
        {{- if $prevURL -}}
        <a href="{{ $prevURL }}" rel="prev">
          <span aria-hidden="true">←</span> Previous
          <span>{{ $prevTitle }}</span>
        </a>
        {{- end -}}
        {{- if and $nextURL $nextTitle -}}
        <a href="{{ $nextURL }}" rel="next">
          Next <span aria-hidden="true">→</span>
          <span>{{ $nextTitle }}</span>
        </a>
        {{- end -}}
      </footer>
      {{- end -}}
    </article>

    {{- with .TableOfContents -}}
    <aside data-toc>
      <h3>On this page</h3>
      {{ . }}
    </aside>
    {{- end -}}

  </section>
{{ end }}