src/sources/models.py

   1 import os
   2 import subprocess
   3 import uuid
   4 from django.apps import apps
   5 from django.conf import settings
   6 from django.db import models
   7 from django.urls import reverse
   8 from django.utils.timezone import now
   9 from django.utils.translation import gettext_lazy as _
  10 from . import conversion
  11 from . import document
  12 from . import utils
  13
  14
  15 class Source(models.Model):
  16     name = models.CharField(_('name'), max_length=1024)
  17     notes = models.TextField(blank=True, help_text=_('private'))
  18     wikisource = models.CharField(max_length=1024, blank=True)
  19     modified_at = models.DateTimeField(null=True, blank=True)
  20     processed_at = models.DateTimeField(null=True, blank=True)
  21
  22     def __str__(self):
  23         return self.name
  24
  25     def get_absolute_url(self):
  26         return reverse('source', args=[self.pk])
  27
  28     def touch(self):
  29         self.modified_at = now()
  30         self.save(update_fields=['modified_at'])
  31
  32     def get_upload_directory(self):
  33         return f'sources/upload/{self.pk}/'
  34
  35     def get_view_directory(self):
  36         return f'sources/view/{self.pk}/'
  37
  38     def get_ocr_directory(self):
  39         return f'sources/ocr/{self.pk}/'
  40
  41     def get_view_files(self):
  42         d = self.get_view_directory()
  43         return [
  44             d + name
  45             for name in sorted(os.listdir(
  46                     os.path.join(settings.MEDIA_ROOT, d)
  47             ))
  48         ]
  49
  50     def get_ocr_files(self):
  51         d = os.path.join(settings.MEDIA_ROOT, self.get_ocr_directory())
  52         return [
  53             d + name
  54             for name in sorted(os.listdir(d))
  55         ]
  56
  57     def process(self):
  58         updir = os.path.join(
  59             settings.MEDIA_ROOT,
  60             self.get_upload_directory()
  61         )
  62         view_dir = os.path.join(
  63             settings.MEDIA_ROOT,
  64             self.get_view_directory()
  65         )
  66         ocr_dir = os.path.join(
  67             settings.MEDIA_ROOT,
  68             self.get_ocr_directory()
  69         )
  70         with utils.replace_dir(view_dir) as d:
  71             self.build_view_directory(updir, d)
  72         with utils.replace_dir(ocr_dir) as d:
  73             self.build_ocr_directory(updir, d)
  74         self.processed_at = now()
  75         self.save(update_fields=['processed_at'])
  76
  77     def build_view_directory(self, srcpath, targetpath):
  78         for source_file_name in os.listdir(srcpath):
  79             print(source_file_name)
  80             src = os.path.join(srcpath, source_file_name)
  81             ext = source_file_name.rsplit('.', 1)[-1].lower()
  82             if ext in ('png', 'jpg', 'jpeg'):
  83                 conversion.resize_image(src, targetpath)
  84                 # cp?
  85                 # maybe resize
  86             elif ext in ('tiff', 'tif'):
  87                 conversion.convert_image(src, targetpath)
  88             elif ext == 'pdf':
  89                 conversion.convert_pdf(src, targetpath)
  90             elif ext == 'djvu':
  91                 conversion.convert_djvu(src, targetpath)
  92             else:
  93                 pass
  94
  95     def build_ocr_directory(self, srcpath, targetpath):
  96         for source_file_name in os.listdir(srcpath):
  97             print(source_file_name)
  98             subprocess.run([
  99                 'tesseract',
 100                 os.path.join(srcpath, source_file_name),
 101                 os.path.join(targetpath, source_file_name),
 102                 '-l', 'pol'
 103             ])
 104
 105
 106 class BookSource(models.Model):
 107     book = models.ForeignKey('catalogue.Book', models.CASCADE)
 108     source = models.ForeignKey(Source, models.CASCADE)
 109     page_start = models.IntegerField(null=True, blank=True)
 110     page_end = models.IntegerField(null=True, blank=True)
 111
 112     class Meta:
 113         ordering = ('page_start',)
 114
 115     def __str__(self):
 116         return f'{self.source} -> {self.book}'
 117
 118     def get_absolute_url(self):
 119         return reverse('source_book_prepare', args=[self.pk])
 120
 121     def get_view_files(self):
 122         # TODO: won't work for PDFs.
 123         files = self.source.get_view_files()
 124         if self.page_end:
 125             files = files[:self.page_end]
 126         if self.page_start:
 127             files = files[self.page_start - 1:]
 128         return files
 129
 130     def get_ocr_files(self):
 131         # TODO: won't work for PDFs.
 132         files = self.source.get_ocr_files()
 133         if self.page_end:
 134             files = files[:self.page_end]
 135         if self.page_start:
 136             files = files[self.page_start - 1:]
 137         return files
 138
 139     def get_document(self):
 140         return self.book.document_books.first()
 141
 142     def prepare_document(self, user=None):
 143         DBook = apps.get_model('documents', 'Book')
 144         texts = document.build_document_texts(self)
 145
 146         dbook = self.get_document()
 147         if dbook is None:
 148             dbook = DBook.create(
 149                 user, texts[0],
 150                 title=self.book.title,
 151                 slug=str(uuid.uuid4()),
 152             )
 153         else:
 154             dbook[0].commit(text=texts[0], description='OCR', author=user)
 155         for text in texts[1:]:
 156             dbook[0].commit(text=text, description='OCR', author=user)
 157
 158         dbook[0].head.set_publishable(True)
 159         return dbook
 160