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{% capture headingsWorkspace %}
{% comment %}
Version 1.0.4
https://github.com/allejo/jekyll-anchor-headings
"Be the pull request you wish to see in the world." ~Ben Balter
Usage:
{% include anchor_headings.html html=content %}
Parameters:
* html (string) - the HTML of compiled markdown generated by kramdown in Jekyll
Optional Parameters:
* beforeHeading (bool) : false - Set to true if the anchor should be placed _before_ the heading's content
* anchorAttrs (string) : '' - Any custom HTML attributes that will be added to the `<a>` tag; you may NOT use `href`, `class` or `title`
* anchorBody (string) : '' - The content that will be placed inside the anchor; the `%heading%` placeholder is available
* anchorClass (string) : '' - The class(es) that will be used for each anchor. Separate multiple classes with a space
* anchorTitle (string) : '' - The `title` attribute that will be used for anchors
* h_min (int) : 1 - The minimum header level to build an anchor for; any header lower than this value will be ignored
* h_max (int) : 6 - The maximum header level to build an anchor for; any header greater than this value will be ignored
* bodyPrefix (string) : '' - Anything that should be inserted inside of the heading tag _before_ its anchor and content
* bodySuffix (string) : '' - Anything that should be inserted inside of the heading tag _after_ its anchor and content
Output:
The original HTML with the addition of anchors inside of all of the h1-h6 headings.
{% endcomment %}
{% assign minHeader = include.h_min | default: 1 %}
{% assign maxHeader = include.h_max | default: 6 %}
{% assign beforeHeading = include.beforeHeading %}
{% assign nodes = include.html | split: '<h' %}
{% capture edited_headings %}{% endcapture %}
{% for _node in nodes %}
{% capture node %}{{ _node | strip }}{% endcapture %}
{% if node == "" %}
{% continue %}
{% endif %}
{% assign nextChar = node | replace: '"', '' | strip | slice: 0, 1 %}
{% assign headerLevel = nextChar | times: 1 %}
<!-- If the level is cast to 0, it means it's not a h1-h6 tag, so let's try to fix it -->
{% if headerLevel == 0 %}
{% if nextChar != '<' and nextChar != '' %}
{% capture node %}<h{{ node }}{% endcapture %}
{% endif %}
{% capture edited_headings %}{{ edited_headings }}{{ node }}{% endcapture %}
{% continue %}
{% endif %}
{% assign _workspace = node | split: '</h' %}
{% assign _idWorkspace = _workspace[0] | split: 'id="' %}
{% assign _idWorkspace = _idWorkspace[1] | split: '"' %}
{% assign html_id = _idWorkspace[0] %}
{% capture _hAttrToStrip %}{{ _workspace[0] | split: '>' | first }}>{% endcapture %}
{% assign header = _workspace[0] | replace: _hAttrToStrip, '' %}
<!-- Build the anchor to inject for our heading -->
{% capture anchor %}{% endcapture %}
{% if html_id and headerLevel >= minHeader and headerLevel <= maxHeader %}
{% capture anchor %}href="#{{ html_id }}"{% endcapture %}
{% if include.anchorClass %}
{% capture anchor %}{{ anchor }} class="{{ include.anchorClass }}"{% endcapture %}
{% endif %}
{% if include.anchorTitle %}
{% capture anchor %}{{ anchor }} title="{{ include.anchorTitle | replace: '%heading%', header }}"{% endcapture %}
{% endif %}
{% if include.anchorAttrs %}
{% capture anchor %}{{ anchor }} {{ include.anchorAttrs }}{% endcapture %}
{% endif %}
{% capture anchor %}<a {{ anchor }}>{{ include.anchorBody | replace: '%heading%', header | default: '' }}</a>{% endcapture %}
<!-- In order to prevent adding extra space after a heading, we'll let the 'anchor' value contain it -->
{% if beforeHeading %}
{% capture anchor %}{{ anchor }} {% endcapture %}
{% else %}
{% capture anchor %} {{ anchor }}{% endcapture %}
{% endif %}
{% endif %}
{% capture new_heading %}
<h{{ _hAttrToStrip }}
{{ include.bodyPrefix }}
{% if beforeHeading %}
{{ anchor }}{{ header }}
{% else %}
{{ header }}{{ anchor }}
{% endif %}
{{ include.bodySuffix }}
</h{{ _workspace | last }}
{% endcapture %}
{% capture edited_headings %}{{ edited_headings }}{{ new_heading }}{% endcapture %}
{% endfor %}
{% endcapture %}{% assign headingsWorkspace = '' %}{{ edited_headings | strip }}