{% capture headingsWorkspace %}
{% comment %}
Copyright (c) 2018 Vladimir "allejo" Jimenez

Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation
files (the "Software"), to deal in the Software without
restriction, including without limitation the rights to use,
copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following
conditions:

The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.
{% endcomment %}
{% comment %}
Version 1.0.9
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 anchorBody="#" %}

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
* headerAttrs (string) : '' - Any custom HTML attributes that will be added to the heading tag; you may NOT use `id`;
the `%heading%` and `%html_id%` placeholders are available
* anchorAttrs (string) : '' - Any custom HTML attributes that will be added to the `<a>` tag; you may NOT use `href`,
    `class` or `title`;
    the `%heading%` and `%html_id%` placeholders are available
    * 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: 2 %}
    {% 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 see if we need to fix it -->
        {% if headerLevel == 0 %}
        <!-- Split up the node based on closing angle brackets and get the first one. -->
        {% assign firstChunk = node | split: '>' | first %}

        <!-- If the first chunk does NOT contain a '<', that means we've broken another HTML tag that starts with 'h' -->
        {% unless firstChunk contains '<' %} {% capture node %}<h{{ node }}{% endcapture %} {% endunless %} {% capture
            edited_headings %}{{ edited_headings }}{{ node }}{% endcapture %} {% continue %} {% endif %} {% capture
            _closingTag %}</h{{ headerLevel }}>{% endcapture %}
            {% assign _workspace = node | split: _closingTag %}
            {% 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 %} {% assign escaped_header=header |
                strip_html %} {% if include.headerAttrs %} {% capture _hAttrToStrip %}{{ _hAttrToStrip | split: '>' |
                first }} {{ include.headerAttrs | replace: '%heading%' , escaped_header | replace: '%html_id%' , html_id
                }}>{% endcapture %}
                {% endif %}

                {% 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%', escaped_header
                }}"{% endcapture %}
                {% endif %}

                {% if include.anchorAttrs %}
                {% capture anchor %}{{ anchor }} {{ include.anchorAttrs | replace: '%heading%', escaped_header |
                replace: '%html_id%', html_id }}{% endcapture %}
                {% endif %}

                {% capture anchor %}<a {{ anchor }}>{{ include.anchorBody | replace: '%heading%', escaped_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{{ headerLevel }}>
                    {% endcapture %}

                    <!--
    If we have content after the `</hX>` tag, then we'll want to append that here so we don't lost any content.
    -->
                    {% assign chunkCount = _workspace | size %}
                    {% if chunkCount > 1 %}
                    {% capture new_heading %}{{ new_heading }}{{ _workspace | last }}{% endcapture %}
                    {% endif %}

                    {% capture edited_headings %}{{ edited_headings }}{{ new_heading }}{% endcapture %}
                    {% endfor %}
                    {% endcapture %}{% assign headingsWorkspace = '' %}{{ edited_headings | strip }}