Django template tag which fits words into block.

gistfile1.py

@register.simple_tag
def fit_words_to_block(src_text, max_str_len, max_str_qty=None):
    """Truncates words from text thus they might be fitted to size of symbols block.

    Also it can limit quantity of strings.
    """
    if not src_text.strip():
        return u''

    words = []
    for word in src_text.split():
        if len(word) > max_str_len:
            splitted_word = split_sequence_by_len(word, max_str_len)
            words.extend(splitted_word)
        else:
            words.append(word)

    if max_str_qty is not None:
        free_str_qty = max_str_qty
        list_of_strings = []
        string = words.pop(0)

        for word in words:
            pretendent_word = u' ' + word
            future_len_of_string = len(string) + len(pretendent_word)
            if max_str_len >= future_len_of_string:
                string += pretendent_word
            else:
                free_str_qty -= 1
                list_of_strings.append(string)
                string = pretendent_word
            if free_str_qty == 0:
                break
        else:
            list_of_strings.append(string)
        truncated_text = u''.join(list_of_strings)
    else:
        truncated_text = u' '.join(words)

    return truncated_text


def split_sequence_by_len(sequence, length):
    """Splits sequence to equal chunks by length."""
    chunk_start_indexes = xrange(0, len(sequence), length)
    return [sequence[index:index + length] for index in chunk_start_indexes]