apps/catalogue/models.py

   1 # -*- coding: utf-8 -*-
   2 #
   3 # This file is part of FNP-Redakcja, licensed under GNU Affero GPLv3 or later.
   4 # Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
   5 #
   6 from django.contrib.auth.models import User
   7 from django.core.urlresolvers import reverse
   8 from django.db import models
   9 from django.utils.translation import ugettext_lazy as _
  10 from django.db.utils import IntegrityError
  11
  12 from slughifi import slughifi
  13
  14 from dvcs import models as dvcs_models
  15 from catalogue.xml_tools import compile_text, split_xml
  16
  17 import logging
  18 logger = logging.getLogger("fnp.catalogue")
  19
  20
  21 class Book(models.Model):
  22     """ A document edited on the wiki """
  23
  24     title = models.CharField(_('title'), max_length=255, db_index=True)
  25     slug = models.SlugField(_('slug'), max_length=128, unique=True, db_index=True)
  26     gallery = models.CharField(_('scan gallery name'), max_length=255, blank=True)
  27
  28     parent = models.ForeignKey('self', null=True, blank=True, verbose_name=_('parent'), related_name="children")
  29     parent_number = models.IntegerField(_('parent number'), null=True, blank=True, db_index=True)
  30
  31     class NoTextError(BaseException):
  32         pass
  33
  34     class Meta:
  35         ordering = ['parent_number', 'title']
  36         verbose_name = _('book')
  37         verbose_name_plural = _('books')
  38         permissions = [('can_pubmark', 'Can mark for publishing')]
  39
  40     def __unicode__(self):
  41         return self.title
  42
  43     def get_absolute_url(self):
  44         return reverse("catalogue_book", args=[self.slug])
  45
  46     @classmethod
  47     def import_xml_text(cls, text=u'', creator=None, previous_book=None,
  48                 *args, **kwargs):
  49
  50         texts = split_xml(text)
  51         if previous_book:
  52             instance = previous_book
  53         else:
  54             instance = cls(*args, **kwargs)
  55             instance.save()
  56
  57         # if there are more parts, set the rest to empty strings
  58         book_len = len(instance)
  59         for i in range(book_len - len(texts)):
  60             texts.append(u'pusta część %d' % (i + 1), u'')
  61
  62         i = 0
  63         for i, (title, text) in enumerate(texts):
  64             if not title:
  65                 title = u'część %d' % (i + 1)
  66
  67             slug = slughifi(title)
  68
  69             if i < book_len:
  70                 chunk = instance[i]
  71                 chunk.slug = slug
  72                 chunk.title = title
  73                 chunk.save()
  74             else:
  75                 chunk = instance.add(slug, title, creator, adjust_slug=True)
  76
  77             chunk.commit(text, author=creator)
  78
  79         return instance
  80
  81     @classmethod
  82     def create(cls, creator=None, text=u'', *args, **kwargs):
  83         """
  84             >>> Book.create(slug='x', text='abc').materialize()
  85             'abc'
  86         """
  87         instance = cls(*args, **kwargs)
  88         instance.save()
  89         instance[0].commit(text, author=creator)
  90         return instance
  91
  92     def __iter__(self):
  93         return iter(self.chunk_set.all())
  94
  95     def __getitem__(self, chunk):
  96         return self.chunk_set.all()[chunk]
  97
  98     def __len__(self):
  99         return self.chunk_set.count()
 100
 101     def __nonzero__(self):
 102         """
 103             Necessary so that __len__ isn't used for bool evaluation.
 104         """
 105         return True
 106
 107     def get_current_changes(self, publishable=True):
 108         """
 109             Returns a list containing one Change for every Chunk in the Book.
 110             Takes the most recent revision (publishable, if set).
 111             Throws an error, if a proper revision is unavailable for a Chunk.
 112         """
 113         if publishable:
 114             changes = [chunk.publishable() for chunk in self]
 115         else:
 116             changes = [chunk.head for chunk in self if chunk.head is not None]
 117         if None in changes:
 118             raise self.NoTextError('Some chunks have no available text.')
 119         return changes
 120
 121     def materialize(self, publishable=False, changes=None):
 122         """
 123             Get full text of the document compiled from chunks.
 124             Takes the current versions of all texts
 125             or versions most recently tagged for publishing,
 126             or a specified iterable changes.
 127         """
 128         if changes is None:
 129             changes = self.get_current_changes(publishable)
 130         return compile_text(change.materialize() for change in changes)
 131
 132     def publishable(self):
 133         if not self.chunk_set.exists():
 134             return False
 135         for chunk in self:
 136             if not chunk.publishable():
 137                 return False
 138         return True
 139
 140     def publish(self, user):
 141         """
 142             Publishes a book on behalf of a (local) user.
 143         """
 144         from apiclient import api_call
 145
 146         changes = self.get_current_changes(publishable=True)
 147         book_xml = book.materialize(changes=changes)
 148         #api_call(user, "books", {"book_xml": book_xml})
 149         # record the publish
 150         br = BookPublishRecord.objects.create(book=self, user=user)
 151         for c in changes:
 152             ChunkPublishRecord.objects.create(book_record=br, change=c)
 153
 154     def make_chunk_slug(self, proposed):
 155         """
 156             Finds a chunk slug not yet used in the book.
 157         """
 158         slugs = set(c.slug for c in self)
 159         i = 1
 160         new_slug = proposed
 161         while new_slug in slugs:
 162             new_slug = "%s_%d" % (proposed, i)
 163             i += 1
 164         return new_slug
 165
 166     def append(self, other, slugs=None, titles=None):
 167         """Add all chunks of another book to self."""
 168         number = self[len(self) - 1].number + 1
 169         len_other = len(other)
 170         single = len_other == 1
 171
 172         if slugs is not None:
 173             assert len(slugs) == len_other
 174         if titles is not None:
 175             assert len(titles) == len_other
 176             if slugs is None:
 177                 slugs = [slughifi(t) for t in titles]
 178
 179         for i, chunk in enumerate(other):
 180             # move chunk to new book
 181             chunk.book = self
 182             chunk.number = number
 183
 184             if titles is None:
 185                 # try some title guessing
 186                 if other.title.startswith(self.title):
 187                     other_title_part = other.title[len(self.title):].lstrip(' /')
 188                 else:
 189                     other_title_part = other.title
 190
 191                 if single:
 192                     # special treatment for appending one-parters:
 193                     # just use the guessed title and original book slug
 194                     chunk.title = other_title_part
 195                     if other.slug.startswith(self.slug):
 196                         chunk_slug = other.slug[len(self.slug):].lstrip('-_')
 197                     else:
 198                         chunk_slug = other.slug
 199                     chunk.slug = self.make_chunk_slug(chunk_slug)
 200                 else:
 201                     chunk.title = "%s, %s" % (other_title_part, chunk.title)
 202             else:
 203                 chunk.slug = slugs[i]
 204                 chunk.title = titles[i]
 205
 206             chunk.slug = self.make_chunk_slug(chunk.slug)
 207             chunk.save()
 208             number += 1
 209         other.delete()
 210
 211     def add(self, *args, **kwargs):
 212         """Add a new chunk at the end."""
 213         return self.chunk_set.reverse()[0].split(*args, **kwargs)
 214
 215     @staticmethod
 216     def listener_create(sender, instance, created, **kwargs):
 217         if created:
 218             instance.chunk_set.create(number=1, slug='1')
 219
 220 models.signals.post_save.connect(Book.listener_create, sender=Book)
 221
 222
 223 class Chunk(dvcs_models.Document):
 224     """ An editable chunk of text. Every Book text is divided into chunks. """
 225
 226     book = models.ForeignKey(Book, editable=False)
 227     number = models.IntegerField()
 228     slug = models.SlugField()
 229     title = models.CharField(max_length=255, blank=True)
 230
 231     class Meta:
 232         unique_together = [['book', 'number'], ['book', 'slug']]
 233         ordering = ['number']
 234
 235     def __unicode__(self):
 236         return "%d:%d: %s" % (self.book_id, self.number, self.title)
 237
 238     def get_absolute_url(self):
 239         return reverse("wiki_editor", args=[self.book.slug, self.slug])
 240
 241     @classmethod
 242     def get(cls, slug, chunk=None):
 243         if chunk is None:
 244             return cls.objects.get(book__slug=slug, number=1)
 245         else:
 246             return cls.objects.get(book__slug=slug, slug=chunk)
 247
 248     def pretty_name(self, book_length=None):
 249         title = self.book.title
 250         if self.title:
 251             title += ", %s" % self.title
 252         if book_length > 1:
 253             title += " (%d/%d)" % (self.number, book_length)
 254         return title
 255
 256     def split(self, slug, title='', creator=None, adjust_slug=False):
 257         """ Create an empty chunk after this one """
 258         self.book.chunk_set.filter(number__gt=self.number).update(
 259                 number=models.F('number')+1)
 260         new_chunk = None
 261         while not new_chunk:
 262             new_slug = self.book.make_chunk_slug(slug)
 263             try:
 264                 new_chunk = self.book.chunk_set.create(number=self.number+1,
 265                     creator=creator, slug=new_slug, title=title)
 266             except IntegrityError:
 267                 pass
 268         return new_chunk
 269
 270     @staticmethod
 271     def listener_saved(sender, instance, created, **kwargs):
 272         if instance.book:
 273             # save book so that its _list_html is reset
 274             instance.book.save()
 275
 276 models.signals.post_save.connect(Chunk.listener_saved, sender=Chunk)
 277
 278
 279 class BookPublishRecord(models.Model):
 280     """
 281         A record left after publishing a Book.
 282     """
 283
 284     book = models.ForeignKey(Book)
 285     timestamp = models.DateTimeField(auto_now_add=True)
 286     user = models.ForeignKey(User)
 287
 288     class Meta:
 289         ordering = ['-timestamp']
 290
 291
 292 class ChunkPublishRecord(models.Model):
 293     """
 294         BookPublishRecord details for each Chunk.
 295     """
 296
 297     book_record = models.ForeignKey(BookPublishRecord)
 298     change = models.ForeignKey(Chunk.change_model)