{%- if meta is defined and meta is not none %}
   {%- set check_meta = True %}
{%- else %}
   {%- set check_meta = False %}
{%- endif %}

{%- if check_meta and 'github_url' in meta %}
   {%- set display_github = True %}
{%- endif %}

{%- if check_meta and 'bitbucket_url' in meta %}
   {%- set display_bitbucket = True %}
{%- endif %}

{%- if check_meta and 'gitlab_url' in meta %}
   {%- set display_gitlab = True %}
{%- endif %}

{%- set display_vcs_links = display_vcs_links if display_vcs_links is defined else True %}

<div role="navigation" aria-label="{{ _('Breadcrumbs') }}">
  <ul class="wy-breadcrumbs">
    {%- block breadcrumbs %}
      <li><a href="{{ pathto(master_doc) }}" class="icon icon-home"></a> &raquo;</li>
        {%- for doc in parents %}
          <li><a href="{{ doc.link|e }}">{{ doc.title }}</a> &raquo;</li>
        {%- endfor %}
      <li>{{ title }}</li>
    {%- endblock %}
    {%- block breadcrumbs_aside %}
      <li class="wy-breadcrumbs-aside" style="text-align: right;">
        {%- if hasdoc(pagename) and display_vcs_links %}
          {%- if display_github %}
            {%- if check_meta and 'github_url' in meta %}
              <!-- User defined GitHub URL -->
              <a href="{{ meta['github_url'] }}" class="fa fa-github"> {{ _('Edit on GitHub') }}</a>
            {%- else %}
              <a href="https://{{ github_host|default("github.com") }}/{{ github_user }}/{{ github_repo }}/{{ theme_vcs_pageview_mode or "blob" }}/{{ github_version }}{{ conf_py_path }}{{ pagename }}{{ page_source_suffix }}" class="fa fa-github"> {{ _('Edit on GitHub') }}</a>
            {%- endif %}
          {%- elif display_bitbucket %}
            {%- if check_meta and 'bitbucket_url' in meta %}
              <!-- User defined Bitbucket URL -->
              <a href="{{ meta['bitbucket_url'] }}" class="fa fa-bitbucket"> {{ _('Edit on Bitbucket') }}</a>
            {%- else %}
              <a href="https://bitbucket.org/{{ bitbucket_user }}/{{ bitbucket_repo }}/src/{{ bitbucket_version}}{{ conf_py_path }}{{ pagename }}{{ page_source_suffix }}?mode={{ theme_vcs_pageview_mode or "view" }}" class="fa fa-bitbucket"> {{ _('Edit on Bitbucket') }}</a>
            {%- endif %}
          {%- elif display_gitlab %}
            {%- if check_meta and 'gitlab_url' in meta %}
              <!-- User defined GitLab URL -->
              <a href="{{ meta['gitlab_url'] }}" class="fa fa-gitlab"> {{ _('Edit on GitLab') }}</a>
            {%- else %}
              <a href="https://{{ gitlab_host|default("gitlab.com") }}/{{ gitlab_user }}/{{ gitlab_repo }}/{{ theme_vcs_pageview_mode or "blob" }}/{{ gitlab_version }}{{ conf_py_path }}{{ pagename }}{{ page_source_suffix }}" class="fa fa-gitlab"> {{ _('Edit on GitLab') }}</a>
            {%- endif %}
          {%- elif show_source and source_url_prefix %}
            <a href="{{ source_url_prefix }}{{ pagename }}{{ page_source_suffix }}">{{ _('View page source') }}</a>
          {%- elif show_source and has_source and sourcename %}
            <a href="{{ pathto('_sources/' + sourcename, true)|e }}" rel="nofollow"> {{ _('View page source') }}</a>
          {%- endif %}
          <a href="https://www.ovito.org" style="padding: 1px;"">www.ovito.org&nbsp;<span class="fa fa-arrow-circle-right" aria-hidden="true"></span></a><br>
          <a href="{{ pathto('python/index.html', true) }}" style="padding: 1px;">Python&nbsp;Reference&nbsp;<span class="fa fa-arrow-circle-right" aria-hidden="true"></span></a>
        {%- endif %}
      </li>
    {%- endblock %}
  </ul>

  {%- if (theme_prev_next_buttons_location == 'top' or theme_prev_next_buttons_location == 'both') and (next or prev) %}
  <div class="rst-breadcrumbs-buttons" role="navigation" aria-label="{{ _('Breadcrumbs') }}">
      {%- if prev %}
        <a href="{{ prev.link|e }}" class="btn btn-neutral float-left" title="{{ prev.title|striptags|e }}" accesskey="p"><span class="fa fa-arrow-circle-left" aria-hidden="true"></span> {{ _('Previous') }}</a>
      {%- endif %}
      {%- if next %}
        <a href="{{ next.link|e }}" class="btn btn-neutral float-right" title="{{ next.title|striptags|e }}" accesskey="n">{{ _('Next') }} <span class="fa fa-arrow-circle-right" aria-hidden="true"></span></a>
      {%- endif %}
  </div>
  {%- endif %}
  <hr/>
</div>