blog/_includes/toc.html

{% capture tocWorkspace %}
    {% comment %}
        Copyright (c) 2017 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 1.2.1
          https://github.com/allejo/jekyll-toc

        "...like all things liquid - where there's a will, and ~36 hours to spare, there's usually a/some way" ~jaybe

        Usage:
            {% include toc.html html=content sanitize=true class="inline_toc" id="my_toc" h_min=2 h_max=3 %}

        Parameters:
            * html         (string) - the HTML of compiled markdown generated by kramdown in Jekyll

        Optional Parameters:
            * sanitize      (bool)   : false  - when set to true, the headers will be stripped of any HTML in the TOC
            * class         (string) :   ''   - a CSS class assigned to the TOC
            * id            (string) :   ''   - an ID to assigned to the TOC
            * h_min         (int)    :   1    - the minimum TOC header level to use; any header lower than this value will be ignored
            * h_max         (int)    :   6    - the maximum TOC header level to use; any header greater than this value will be ignored
            * ordered       (bool)   : false  - when set to true, an ordered list will be outputted instead of an unordered list
            * item_class    (string) :   ''   - add custom class(es) for each list item; has support for '%level%' placeholder, which is the current heading level
            * submenu_class (string) :   ''   - add custom class(es) for each child group of headings; has support for '%level%' placeholder which is the current "submenu" heading level
            * base_url      (string) :   ''   - add a base url to the TOC links for when your TOC is on another page than the actual content
            * anchor_class  (string) :   ''   - add custom class(es) for each anchor element
            * skip_no_ids   (bool)   : false  - skip headers that do not have an `id` attribute
            * flat_toc      (bool)   : false  - when set to true, the TOC will be a single level list

        Output:
            An ordered or unordered list representing the table of contents of a markdown block. This snippet will only
            generate the table of contents and will NOT output the markdown given to it
    {% endcomment %}

    {% capture newline %}
    {% endcapture %}
    {% assign newline = newline | rstrip %} <!-- Remove the extra spacing but preserve the newline -->

    {% capture deprecation_warnings %}{% endcapture %}

    {% if include.baseurl %}
        {% capture deprecation_warnings %}{{ deprecation_warnings }}<!-- jekyll-toc :: "baseurl" has been deprecated, use "base_url" instead -->{{ newline }}{% endcapture %}
    {% endif %}

    {% if include.skipNoIDs %}
        {% capture deprecation_warnings %}{{ deprecation_warnings }}<!-- jekyll-toc :: "skipNoIDs" has been deprecated, use "skip_no_ids" instead -->{{ newline }}{% endcapture %}
    {% endif %}

    {% capture jekyll_toc %}{% endcapture %}
    {% assign orderedList = include.ordered | default: false %}
    {% assign flatToc = include.flat_toc | default: false %}
    {% assign baseURL = include.base_url | default: include.baseurl | default: '' %}
    {% assign skipNoIDs = include.skip_no_ids | default: include.skipNoIDs | default: false %}
    {% assign minHeader = include.h_min | default: 1 %}
    {% assign maxHeader = include.h_max | default: 6 %}
    {% assign nodes = include.html | strip | split: '<h' %}

    {% assign firstHeader = true %}
    {% assign currLevel = 0 %}
    {% assign lastLevel = 0 %}

    {% capture listModifier %}{% if orderedList %}ol{% else %}ul{% endif %}{% endcapture %}

    {% for node in nodes %}
        {% if node == "" %}
            {% continue %}
        {% endif %}

        {% assign currLevel = node | replace: '"', '' | slice: 0, 1 | times: 1 %}

        {% if currLevel < minHeader or currLevel > maxHeader %}
            {% continue %}
        {% endif %}

        {% assign _workspace = node | split: '</h' %}

        {% assign _idWorkspace = _workspace[0] | split: 'id="' %}
        {% assign _idWorkspace = _idWorkspace[1] | split: '"' %}
        {% assign htmlID = _idWorkspace[0] %}

        {% assign _classWorkspace = _workspace[0] | split: 'class="' %}
        {% assign _classWorkspace = _classWorkspace[1] | split: '"' %}
        {% assign htmlClass = _classWorkspace[0] %}

        {% if htmlClass contains "no_toc" %}
            {% continue %}
        {% endif %}

        {% if firstHeader %}
            {% assign minHeader = currLevel %}
        {% endif %}

        {% capture _hAttrToStrip %}{{ _workspace[0] | split: '>' | first }}>{% endcapture %}
        {% assign header = _workspace[0] | replace: _hAttrToStrip, '' %}

        {% if include.item_class and include.item_class != blank %}
            {% capture listItemClass %} class="{{ include.item_class | replace: '%level%', currLevel | split: '.' | join: ' ' }}"{% endcapture %}
        {% endif %}

        {% if include.submenu_class and include.submenu_class != blank %}
            {% assign subMenuLevel = currLevel | minus: 1 %}
            {% capture subMenuClass %} class="{{ include.submenu_class | replace: '%level%', subMenuLevel | split: '.' | join: ' ' }}"{% endcapture %}
        {% endif %}

        {% capture anchorBody %}{% if include.sanitize %}{{ header | strip_html }}{% else %}{{ header }}{% endif %}{% endcapture %}

        {% if htmlID %}
            {% capture anchorAttributes %} href="{% if baseURL %}{{ baseURL }}{% endif %}#{{ htmlID }}"{% endcapture %}

            {% if include.anchor_class %}
                {% capture anchorAttributes %}{{ anchorAttributes }} class="{{ include.anchor_class | split: '.' | join: ' ' }}"{% endcapture %}
            {% endif %}

            {% capture listItem %}<a{{ anchorAttributes }}>{{ anchorBody }}</a>{% endcapture %}
        {% elsif skipNoIDs == true %}
            {% continue %}
        {% else %}
            {% capture listItem %}{{ anchorBody }}{% endcapture %}
        {% endif %}

        {% if currLevel > lastLevel and flatToc == false %}
            {% capture jekyll_toc %}{{ jekyll_toc }}<{{ listModifier }}{{ subMenuClass }}>{% endcapture %}
        {% elsif currLevel < lastLevel and flatToc == false %}
            {% assign repeatCount = lastLevel | minus: currLevel %}

            {% for i in (1..repeatCount) %}
                {% capture jekyll_toc %}{{ jekyll_toc }}</li></{{ listModifier }}>{% endcapture %}
            {% endfor %}

            {% capture jekyll_toc %}{{ jekyll_toc }}</li>{% endcapture %}
        {% else %}
            {% capture jekyll_toc %}{{ jekyll_toc }}</li>{% endcapture %}
        {% endif %}

        {% capture jekyll_toc %}{{ jekyll_toc }}<li{{ listItemClass }}>{{ listItem }}{% endcapture %}

        {% assign lastLevel = currLevel %}
        {% assign firstHeader = false %}
    {% endfor %}

    {% if flatToc == true %}
        {% assign repeatCount = 1 %}
    {% else %}
        {% assign repeatCount = minHeader | minus: 1 %}
        {% assign repeatCount = lastLevel | minus: repeatCount %}
    {% endif %}

    {% for i in (1..repeatCount) %}
        {% capture jekyll_toc %}{{ jekyll_toc }}</li></{{ listModifier }}>{% endcapture %}
    {% endfor %}

    {% if jekyll_toc != '' %}
        {% assign rootAttributes = '' %}
        {% if include.class and include.class != blank %}
            {% capture rootAttributes %} class="{{ include.class | split: '.' | join: ' ' }}"{% endcapture %}
        {% endif %}

        {% if include.id and include.id != blank %}
            {% capture rootAttributes %}{{ rootAttributes }} id="{{ include.id }}"{% endcapture %}
        {% endif %}

        {% if rootAttributes %}
            {% assign nodes = jekyll_toc | split: '>' %}
            {% capture jekyll_toc %}<{{ listModifier }}{{ rootAttributes }}>{{ nodes | shift | join: '>' }}>{% endcapture %}
        {% endif %}
    {% endif %}
{% endcapture %}{% assign tocWorkspace = '' %}{{ deprecation_warnings }}{{ jekyll_toc -}}