| import math | |
| def head_tail_truncate(text, max_length=510): | |
| """ | |
| Truncate the text using the head+tail method. | |
| Keep the first head_length characters and the last (max_length - head_length) characters. | |
| """ | |
| head_length = math.floor(0.2 * max_length) | |
| tail_length = max_length - head_length | |
| if len(text) <= max_length: | |
| return text | |
| return text[:head_length] + text[-(tail_length - head_length) :] | |