# -*- coding: utf-8 -*-

#

# Copyright IRI (c) 2013

#

# contact@iri.centrepompidou.fr

#

# This software is governed by the CeCILL-B license under French law and

# abiding by the rules of distribution of free software.  You can  use, 

# modify and/ or redistribute the software under the terms of the CeCILL-B

# license as circulated by CEA, CNRS and INRIA at the following URL

# "http://www.cecill.info". 

#

# As a counterpart to the access to the source code and  rights to copy,

# modify and redistribute granted by the license, users are provided only

# with a limited warranty  and the software's author,  the holder of the

# economic rights,  and the successive licensors  have only  limited

# liability. 

#

# In this respect, the user's attention is drawn to the risks associated

# with loading,  using,  modifying and/or developing or reproducing the

# software by the user in light of its specific status of free software,

# that may mean  that it is complicated to manipulate,  and  that  also

# therefore means  that it is reserved for developers  and  experienced

# professionals having in-depth computer knowledge. Users are therefore

# encouraged to load and test the software's suitability as regards their

# requirements in conditions enabling the security of their systems and/or 

# data to be ensured and,  more generally, to use and operate it in the 

# same conditions as regards security. 

#

# The fact that you are presently reading this means that you have had

# knowledge of the CeCILL-B license and that you accept its terms.

#

'''

Created on Oct 9, 2013

From http://djangosnippets.org/snippets/1376/

@author: ymh

'''

from os.path import dirname, join, abspath, isdir

from django.core.exceptions import ImproperlyConfigured

from django.db.models import get_app

from django.template import TemplateDoesNotExist

from django.template.loaders.filesystem import Loader as FilesystemLoader

def get_template_vars(template_name):

    app_name, template_name = template_name.split(":", 1)

    try:

        template_dir = abspath(join(dirname(get_app(app_name).__file__), 'templates'))

    except ImproperlyConfigured:

        raise TemplateDoesNotExist()

    return template_name, template_dir

class Loader(FilesystemLoader):

    is_usable = True

    def get_template_sources(self, template_name, template_dirs=None):

        if ":" not in template_name:

            raise TemplateDoesNotExist()

        template_name, template_dir = get_template_vars(template_name)

        if not isdir(template_dir):

            raise TemplateDoesNotExist()

        return [join(template_dir, template_name)]