{% if user.is_anonymous %}
    {% url "login" as login_url %}
    {% if login_url %}
        <p>Try <a id="login" href="{{ login_url }}?next={{ full_path|urlencode }}">logging in</a>.</p>
    {% endif %}
{% else %}
    <p>Logged in as <span id="username">{{ user.get_username }}</span>.</p>
{% endif %}