safe_firstof.py

from django import template
from django.template import defaulttags
from django.utils.safestring import mark_for_escaping

register = template.Library()

class EscapedNode(template.Node):
    def __init__(self, node):
        self.node = node
        
    def render(self, context):
        return mark_for_escaping(self.node.render(context))

@register.tag
def firstof(parser, token):
    node = defaulttags.firstof(parser, token)
    return EscapedNode(node)