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| {{- $headers := findRE "<h[1-6].*?>(.|\n])+?</h[1-6]>" .Content -}}
{{- $has_headers := ge (len $headers) 1 -}}
{{- if $has_headers -}}
<aside id="toc-container" class="toc-container wide">
<div class="toc">
<details {{if (.Param "TocOpen") }} open{{ end }}>
<summary accesskey="c" title="(Alt + C)">
<span class="details">{{- i18n "toc" | default "Table of Contents" }}</span>
</summary>
<div class="inner">
{{- $largest := 6 -}}
{{- range $headers -}}
{{- $headerLevel := index (findRE "[1-6]" . 1) 0 -}}
{{- $headerLevel := len (seq $headerLevel) -}}
{{- if lt $headerLevel $largest -}}
{{- $largest = $headerLevel -}}
{{- end -}}
{{- end -}}
{{- $firstHeaderLevel := len (seq (index (findRE "[1-6]" (index $headers 0) 1) 0)) -}}
{{- $.Scratch.Set "bareul" slice -}}
<ul>
{{- range seq (sub $firstHeaderLevel $largest) -}}
<ul>
{{- $.Scratch.Add "bareul" (sub (add $largest .) 1) -}}
{{- end -}}
{{- range $i, $header := $headers -}}
{{- $headerLevel := index (findRE "[1-6]" . 1) 0 -}}
{{- $headerLevel := len (seq $headerLevel) -}}
{{/* get id="xyz" */}}
{{- $id := index (findRE "(id=\"(.*?)\")" $header 9) 0 }}
{{- /* strip id="" to leave xyz, no way to get regex capturing groups in hugo */ -}}
{{- $cleanedID := replace (replace $id "id=\"" "") "\"" "" }}
{{- $header := replaceRE "<h[1-6].*?>((.|\n])+?)</h[1-6]>" "$1" $header -}}
{{- if ne $i 0 -}}
{{- $prevHeaderLevel := index (findRE "[1-6]" (index $headers (sub $i 1)) 1) 0 -}}
{{- $prevHeaderLevel := len (seq $prevHeaderLevel) -}}
{{- if gt $headerLevel $prevHeaderLevel -}}
{{- range seq $prevHeaderLevel (sub $headerLevel 1) -}}
<ul>
{{/* the first should not be recorded */}}
{{- if ne $prevHeaderLevel . -}}
{{- $.Scratch.Add "bareul" . -}}
{{- end -}}
{{- end -}}
{{- else -}}
</li>
{{- if lt $headerLevel $prevHeaderLevel -}}
{{- range seq (sub $prevHeaderLevel 1) -1 $headerLevel -}}
{{- if in ($.Scratch.Get "bareul") . -}}
</ul>
{{/* manually do pop item */}}
{{- $tmp := $.Scratch.Get "bareul" -}}
{{- $.Scratch.Delete "bareul" -}}
{{- $.Scratch.Set "bareul" slice}}
{{- range seq (sub (len $tmp) 1) -}}
{{- $.Scratch.Add "bareul" (index $tmp (sub . 1)) -}}
{{- end -}}
{{- else -}}
</ul>
</li>
{{- end -}}
{{- end -}}
{{- end -}}
{{- end }}
<li>
<a href="#{{- $cleanedID -}}" aria-label="{{- $header | plainify -}}">{{- $header | safeHTML -}}</a>
{{- else }}
<li>
<a href="#{{- $cleanedID -}}" aria-label="{{- $header | plainify -}}">{{- $header | safeHTML -}}</a>
{{- end -}}
{{- end -}}
<!-- {{- $firstHeaderLevel := len (seq (index (findRE "[1-6]" (index $headers 0) 1) 0)) -}} -->
{{- $firstHeaderLevel := $largest }}
{{- $lastHeaderLevel := len (seq (index (findRE "[1-6]" (index $headers (sub (len $headers) 1)) 1) 0)) }}
</li>
{{- range seq (sub $lastHeaderLevel $firstHeaderLevel) -}}
{{- if in ($.Scratch.Get "bareul") (add . $firstHeaderLevel) }}
</ul>
{{- else }}
</ul>
</li>
{{- end -}}
{{- end }}
</ul>
</div>
</details>
</div>
</aside>
<script>
let activeElement;
let elements;
window.addEventListener('DOMContentLoaded', function (event) {
checkTocPosition();
elements = document.querySelectorAll('h1[id],h2[id],h3[id],h4[id],h5[id],h6[id]');
// Make the first header active
activeElement = elements[0];
const id = encodeURI(activeElement.getAttribute('id')).toLowerCase();
document.querySelector(`.inner ul li a[href="#${id}"]`).classList.add('active');
}, false);
window.addEventListener('resize', function(event) {
checkTocPosition();
}, false);
window.addEventListener('scroll', () => {
// Check if there is an object in the top half of the screen or keep the last item active
activeElement = Array.from(elements).find((element) => {
if ((getOffsetTop(element) - window.pageYOffset) > 0 &&
(getOffsetTop(element) - window.pageYOffset) < window.innerHeight/2) {
return element;
}
}) || activeElement
elements.forEach(element => {
const id = encodeURI(element.getAttribute('id')).toLowerCase();
if (element === activeElement){
document.querySelector(`.inner ul li a[href="#${id}"]`).classList.add('active');
} else {
document.querySelector(`.inner ul li a[href="#${id}"]`).classList.remove('active');
}
})
}, false);
const main = parseInt(getComputedStyle(document.body).getPropertyValue('--article-width'), 10);
const toc = parseInt(getComputedStyle(document.body).getPropertyValue('--toc-width'), 10);
const gap = parseInt(getComputedStyle(document.body).getPropertyValue('--gap'), 10);
function checkTocPosition() {
const width = document.body.scrollWidth;
if (width - main - (toc * 2) - (gap * 4) > 0) {
document.getElementById("toc-container").classList.add("wide");
} else {
document.getElementById("toc-container").classList.remove("wide");
}
}
function getOffsetTop(element) {
if (!element.getClientRects().length) {
return 0;
}
let rect = element.getBoundingClientRect();
let win = element.ownerDocument.defaultView;
return rect.top + win.pageYOffset;
}
</script>
{{- end }}
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