Django snippets

import datetime
from django import template
register = template.Library()

if 1: # explicit tag name

    @register.tag('current_time')
    class CurrentTimeNode(template.Node):
        def __init__(self, parser, token):
            try:
                # split_contents() knows not to split quoted strings.
                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
            self.format_string = str(format_string[1:-1])
            
        def render(self, context):
            return datetime.datetime.now().strftime(self.format_string)

else: # implicit tag name
    
    @register.tag
    class current_time(template.Node):
        def __init__(self, parser, token):
            try:
                # split_contents() knows not to split quoted strings.
                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
            self.format_string = str(format_string[1:-1])
            
        def render(self, context):
            return datetime.datetime.now().strftime(self.format_string)