# -*- coding: utf-8 -*-
#
# Copyright (C) 2013 Branko Majic
#
# This file is part of Django Conntrackt.
#
# Django Conntrackt is free software: you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the Free
# Software Foundation, either version 3 of the License, or (at your option) any
# later version.
#
# Django Conntrackt is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
# details.
#
# You should have received a copy of the GNU General Public License along with
# Django Conntrackt. If not, see .
#
# Django imports.
from django import template
from django import urls
from django.utils.html import format_html
# Get an instance of Django's template library.
register = template.Library()
@register.simple_tag(takes_context=False)
def html_link(text, view, *args, **kwargs):
"""
A small wrapper for showing HTML links.
Positional arguments:
text - Text that should be used as a link.
view - View name for which the URL should be shown
args - Additional positional arguments that will be passed to resolver
for creating the URL.
Keyword arguments:
id - Identifier for the HTML element.
class - Class(es) for the HTML element.
title - Title for the HTML element.
get - Additional GET parameter that should be appended to the URL.
"""
# Verify the passed-in keyword arguments first.
for key in kwargs.keys():
if key not in ("get", "class", "title", "id"):
raise template.TemplateSyntaxError("Unknown argument for 'html_link' tag: %r" % key)
# Generate the URL by using the supplied view name and arguments that should
# be passed to the view.
url = urls.reverse(view, args=args)
# Set-up the base pattern (url, parameters, text).
if 'get' in kwargs:
pattern = '{text}'
# Render the tag.
return format_html(pattern, url=url, text=text, **kwargs)
@register.simple_tag(takes_context=True)
def active_link(context, url_name, return_value='active', **kwargs):
"""
This template tag can be used to check if the provided URL matches against
the path from the request or not.
Arguments:
context - Context of the current view being called.
url_name - Name of the URL that's being checked against current path from
request.
"""
matches = current_url_equals(context, url_name, **kwargs)
return return_value if matches else ''
def current_url_equals(context, url_name, **kwargs):
"""
Helper function for checking if the specified URL corresponds to the current
request path in the context.
Arguments:
- context - Context of the view being rendered.
- url_name - Name of the URL against which the context request path is
being checked.
"""
# Assume that we have not been able to resolve the request path to an URL.
resolved = False
try:
# Use the request path, and resolve it to a URL name.
resolved = urls.resolve(context.get('request').path)
except urls.Resolver404:
# This means we haven't been able to resolve the path from request.
pass
# If the request was resolved and URL names match, verify that the kwargs
# match as well.
matches = resolved and resolved.url_name == url_name
if matches and kwargs:
for key in kwargs:
kwarg = kwargs.get(key)
resolved_kwarg = resolved.kwargs.get(key)
if not resolved_kwarg or kwarg != resolved_kwarg:
return False
return matches