from django import template
from django.shortcuts import render_to_response

register = template.Library()
register.tag('custom_text', do_custom_text)

class CustomTextNode(template.Node):
    def __init__(self, format_string):
        self.format_string = format_string
    def render(self, context):
        return render_to_response('custom_text.html')

def do_custom_text(parser, token):
    try:
        tag_name, format_string = token.split_contents()
    except ValueError:
        raise template.TemplateSyntaxError, "%r tag requires a single argument" % token.contents.split()[0]
    if not (format_string[0] == format_string[-1] and format_string[0] in ('"', "'")):
        raise template.TemplateSyntaxError, "%r tag's argument should be in quotes" % tag_name
    return CustomTextNode(format_string[1:-1])