A filter that batches items. It works pretty much like `slice`
    just the other way round. It returns a list of lists with the
    given number of items. If you provide a second parameter this
    is used to fill up missing items. See this example:

    .. sourcecode:: html+jinja

        <table>
        {%- for row in items|batch(3, '&nbsp;') %}
          <tr>
          {%- for column in row %}
            <td>{{ column }}</td>
          {%- endfor %}
          </tr>
        {%- endfor %}
        </table>

def do_batch(value, linecount, fill_with=None):
    """
    A filter that batches items. It works pretty much like `slice`
    just the other way round. It returns a list of lists with the
    given number of items. If you provide a second parameter this
    is used to fill up missing items. See this example:

    .. sourcecode:: html+jinja

        <table>
        {%- for row in items|batch(3, '&nbsp;') %}
          <tr>
          {%- for column in row %}
            <td>{{ column }}</td>
          {%- endfor %}
          </tr>
        {%- endfor %}
        </table>
    """
    tmp = []
    for item in value:
        if len(tmp) == linecount:
            yield tmp
            tmp = []
        tmp.append(item)
    if tmp:
        if fill_with is not None and len(tmp) < linecount:
            tmp += [fill_with] * (linecount - len(tmp))
        yield tmp