-# -*- coding: utf-8 -*-
-# This file is part of Wolnelektury, licensed under GNU Affero GPLv3 or later.
-# Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
-#
-from django.conf import settings
-from django.contrib.contenttypes.fields import GenericRelation
-from django.core.cache import caches
-from django.core.urlresolvers import reverse
-from django.db import models
-from django.template.loader import render_to_string
-from django.utils.safestring import mark_safe
-from django.utils.translation import get_language, ugettext_lazy as _
-from newtagging import managers
-from catalogue.models import Tag
-
-
-permanent_cache = caches['permanent']
-
-
-class Fragment(models.Model):
- """Represents a themed fragment of a book."""
- text = models.TextField()
- short_text = models.TextField(editable=False)
- anchor = models.CharField(max_length=120)
- book = models.ForeignKey('Book', related_name='fragments')
-
- objects = models.Manager()
- tagged = managers.ModelTaggedItemManager(Tag)
- tags = managers.TagDescriptor(Tag)
- tag_relations = GenericRelation(Tag.intermediary_table_model)
-
- class Meta:
- ordering = ('book', 'anchor',)
- verbose_name = _('fragment')
- verbose_name_plural = _('fragments')
- app_label = 'catalogue'
-
- def get_absolute_url(self):
- return '%s#m%s' % (reverse('book_text', args=[self.book.slug]), self.anchor)
-
- def reset_short_html(self):
- if self.id is None:
- return
-
- cache_key = "Fragment.short_html/%d/%s"
- for lang, langname in settings.LANGUAGES:
- permanent_cache.delete(cache_key % (self.id, lang))
-
- def get_short_text(self):
- """Returns short version of the fragment."""
- return self.short_text if self.short_text else self.text
-
- def short_html(self):
- if self.id:
- cache_key = "Fragment.short_html/%d/%s" % (self.id, get_language())
- short_html = permanent_cache.get(cache_key)
- else:
- short_html = None
-
- if short_html is not None:
- return mark_safe(short_html)
- else:
- short_html = unicode(render_to_string('catalogue/fragment_short.html',
- {'fragment': self}))
- if self.id:
- permanent_cache.set(cache_key, short_html)
- return mark_safe(short_html)