Produits Entr'ouvert » Authentic 2

# This is a copy of http://djangosnippets.org/snippets/1289/

#

# it provides two template tags to use in HTML templates: breadcrumb and

# breadcrumb_url.

#

# The first allows creating of simple url, with the text portion and url

# portion. Or only unlinked text (as the last item in breadcrumb trail for

# example). The second, can actually take the named url with arguments.

# Additionally it takes a title as the first argument.

#

# Initial Author: Andriy Drozdyuk

from django import template

from django.template import loader, Node, Variable

from django.utils.encoding import smart_str, smart_unicode

from django.template.defaulttags import url

from django.template import VariableDoesNotExist

register = template.Library()

@register.tag

def breadcrumb(parser, token):

    """

    Renders the breadcrumb.

    Examples:

        {% breadcrumb "Title of breadcrumb" url_var %}

        {% breadcrumb context_var  url_var %}

        {% breadcrumb "Just the title" %}

        {% breadcrumb just_context_var %}

    Parameters:

    -First parameter is the title of the crumb,

    -Second (optional) parameter is the url variable to link to, produced by url tag, i.e.:

        {% url 'person_detail' object.id as person_url %}

        then:

        {% breadcrumb person.name person_url %}

    @author Andriy Drozdyuk

    """

    return BreadcrumbNode(token.split_contents()[1:])

@register.tag

def breadcrumb_url(parser, token):

    """

    Same as breadcrumb

    but instead of url context variable takes in all the

    arguments URL tag takes.

        {% breadcrumb "Title of breadcrumb" person_detail person.id %}

        {% breadcrumb person.name person_detail person.id %}

    """

    bits = token.split_contents()

    if len(bits)==2:

        return breadcrumb(parser, token)

    # Extract our extra title parameter

    title = bits.pop(1)

    token.contents = ' '.join(bits)

    url_node = url(parser, token)

    return UrlBreadcrumbNode(title, url_node)

class BreadcrumbNode(Node):

    def __init__(self, vars):

        """

        First var is title, second var is url context variable

        """

        self.vars = map(Variable,vars)

    def render(self, context):

        title = self.vars[0].var

        if title.find("'")==-1 and title.find('"')==-1:

            try:

                val = self.vars[0]

                title = val.resolve(context)

            except:

                title = ''

        else:

            title=title.strip("'").strip('"')

            title=smart_unicode(title)

        url = None

        if len(self.vars)>1:

            val = self.vars[1]

            try:

                url = val.resolve(context)

            except VariableDoesNotExist:

                url = None

        return create_crumb(title, url)

class UrlBreadcrumbNode(Node):

    def __init__(self, title, url_node):

        self.title = Variable(title)

        self.url_node = url_node

    def render(self, context):

        title = self.title.var

        if title.find("'")==-1 and title.find('"')==-1:

            try:

                val = self.title

                title = val.resolve(context)

            except:

                title = ''

        else:

            title=title.strip("'").strip('"')

            title=smart_unicode(title)

        url = self.url_node.render(context)

        return create_crumb(title, url)

def create_crumb(title, url=None):

    """

    Helper function

    """

    crumb = """<span class="breadcrumbs-arrow">""" \

            """ > """ \

            """</span>"""

    if url:

        crumb = "%s <a href='%s'>%s</a>" % (crumb, url, title)

    else:

        crumb = "%s %s" % (crumb, title)

    return crumb

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