Custom Django template filter: Confine a string to a max length, replace last three characters with ellipses

custom_filter_truncate_with_ellipses.py

from django import template
register = template.Library()

@register.filter(name="truncate_with_ellipses")
def truncate_with_ellipses(value: str, max_length: int) -> str:
    """
    Confine a string to a max length, replace last three characters with ellipses
    """
    if len(value) <= max_length:
        return value
    else:
        truncated_value = value[: max_length - 3] + "..."
        return truncated_value

# Usage in template: {{variable|truncate_with_ellipses:50}}