layouts/partials/toc.html


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<!-- toc.html -->
<!-- ignore empty links with + -->
{{ $headers := findRE "<h[1-4].*?>(.|\n])+?</h[1-4]>" .Content }}
<!-- at least one header to link to -->
{{ if ge (len $headers) 1 }}
{{ $h1_n := len (findRE "(.|\n])+?" .Content) }}
{{ $re := (cond (eq $h1_n 0) "<h[2-4]" "<h[1-4]") }}
{{ $renum := (cond (eq $h1_n 0) "[2-4]" "[1-4]") }}

<!--Scrollspy-->
<div class="toc">

    <div class="page-header"><strong>目录</strong></div>

    <div id="page-scrollspy" class="toc-nav">

        {{ range $headers }}
        {{ $header := . }}
            {{ range first 1 (findRE $re $header 1) }}
                {{ range findRE $renum . 1 }}
                {{ $next_heading := (cond (eq $h1_n 0) (sub (int .) 1 ) (int . ) ) }}
                    {{ range seq $next_heading }}
                    <ul class="nav">
                    {{end}}
                    {{ $anchorId := (replaceRE ".* id=\"(.*?)\".*" "$1" $header ) }}
                        <li class="nav-item">
                            <a class="nav-link text-left" href="#{{ $anchorId }}">
                            {{ $header | plainify | htmlUnescape }}
                            </a>
                        </li>
                    <!-- close list -->
                    {{ range seq $next_heading }}
                    </ul>
                    {{ end }}
                {{ end }}
            {{ end }}
        {{ end }}

    </div>

</div>
<!--Scrollspy-->

{{ end }}