gitbook/theme/templates/website/includes/summary.html

{% macro articles(_articles) %}
    {% for item in _articles %}
        <li class="chapter {% if item.path == _input %}active{% endif %}" data-level="{{ item.level }}" {% if item.path and not item.external %}data-path="{{ item.path|contentLink }}"{% endif %}>
            {% if item.path and item.exists %}
                {% if not item.external %}
                    <a href="{{ basePath }}/{{ item.path|contentLink }}">
                        <i class="fa fa-check"></i>
                        {% if item.level != "0" %}
                            <b>{{ item.level }}.</b>
                        {% endif %}
                        {% if item.introduction %}{% i18n "SUMMARY_INTRODUCTION" %}Introduction{% endi18n %}{% else %}{{ item.title }}{% endif %}
                    </a>
                {% else %}
                    <a target="_blank" href="{{ item.path }}">
                        <i class="fa fa-check"></i>
                        {% if item.level != "0" %}
                            <b>{{ item.level }}.</b>
                        {% endif %}
                        {{ item.title }}
                    </a>
                {% endif %}
            {% else %}
            <span><b>{{ item.level }}.</b> {{ item.title }}</span>
            {% endif %}
            {% if item.articles.length > 0 %}
            <ul class="articles">
                {{ articles(item.articles) }}
            </ul>
            {% endif %}
        </li>
    {% endfor %}
{% endmacro %}

<div class="book-summary">
    <div class="book-search">
        <input type="text" placeholder="{% i18n "SEARCH_PLACEHOLDER" %}Type to search{% endi18n %}" class="form-control" />
    </div>
    <ul class="summary">
        {% set _divider = false %}
    	{% if options.links.sidebar %}
    	{% for link in options.links.sidebar %}
    	    {% set _divider = true %}
            <li>
                <a href="{{ options.links.sidebar[loop.key] }}" target="blank" class="custom-link">{{ loop.key }}</a>
            </li>
    	{% endfor %}
    	{% endif %}

        {% if _divider %}
        <li class="divider"></li>
        {% endif %}

        {{ articles(summary.chapters) }}

        {% if options.links.gitbook != false %}
        <li class="divider"></li>
        <li>
            <a href="https://www.gitbook.com" target="blank" class="gitbook-link">{% i18n "GITBOOK_LINK" %}Published using GitBook{% endi18n %}</a>
        </li>
        {% endif %}
    </ul>
</div>