def do_fake_filter( formatter, arg=None ):
    """
    call a faker format
    uses:

        {{ 'randomElement'|fake:mylist }}
        {% if 'boolean'|fake:30 %} .. {% endif %}
        {% for word in 'words'|fake:times %}{{ word }}\n{% endfor %}

    """
    args = []
    if not arg is None: args.append(arg)
    return Faker.getGenerator().format( formatter, *args )
call a faker format
    uses:

        {{ 'randomElement'|fake:mylist }}
        {% if 'boolean'|fake:30 %} .. {% endif %}
        {% for word in 'words'|fake:times %}{{ word }}\n{% endfor %}