{% macro avatar(jid) %}
    {%- if identities is defined -%}
        {%- if identities[jid].avatar_basename is defined %}
            <img class="avatar" src="{{cache_path}}{{identities[jid].avatar_basename}}">
        {% else %}
            <span class="avatar generated">{{author|first|upper}}</span>
        {%- endif -%}
    {%- endif -%}
{% endmacro %}