librarian/mobi.py

   1 # -*- coding: utf-8 -*-
   2 #
   3 # This file is part of Librarian, licensed under GNU Affero GPLv3 or later.
   4 # Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
   5 #
   6 from copy import deepcopy
   7 import os
   8 import subprocess
   9 from tempfile import NamedTemporaryFile
  10
  11 from librarian import OutputFile
  12 from librarian.cover import ImageCover as WLCover
  13 from librarian import get_resource
  14
  15
  16 def transform(wldoc, verbose=False,
  17               sample=None, cover=None, flags=None):
  18     """ produces a MOBI file
  19
  20     wldoc: a WLDocument
  21     sample=n: generate sample e-book (with at least n paragraphs)
  22     cover: a cover.Cover object
  23     flags: less-advertising,
  24     """
  25
  26     document = deepcopy(wldoc)
  27     del wldoc
  28     book_info = document.book_info
  29
  30     # provide a cover by default
  31     if not cover:
  32         cover = WLCover
  33     c = cover(book_info)
  34     import Image
  35     c.im = Image.open('cover.jpg')
  36     c.ext = lambda: 'jpg'
  37     cover_file = NamedTemporaryFile(suffix='.' + c.ext(), delete=False)
  38     c.save(cover_file)
  39
  40     if cover.uses_dc_cover:
  41         if document.book_info.cover_by:
  42             document.edoc.getroot().set('data-cover-by', document.book_info.cover_by)
  43         if document.book_info.cover_source:
  44             document.edoc.getroot().set('data-cover-source', document.book_info.cover_source)
  45
  46     if not flags:
  47         flags = []
  48     flags = list(flags) + ['without-fonts']
  49     epub = document.as_epub(verbose=verbose, sample=sample, html_toc=True,
  50             flags=flags, style=get_resource('mobi/style.css'))
  51
  52     if verbose:
  53         kwargs = {}
  54     else:
  55         devnull = open("/dev/null", 'w')
  56         kwargs = {"stdout": devnull, "stderr": devnull}
  57
  58     output_file = NamedTemporaryFile(prefix='librarian', suffix='.mobi', delete=False)
  59     output_file.close()
  60     subprocess.check_call(['ebook-convert', epub.get_filename(), output_file.name,
  61             '--no-inline-toc', '--cover=%s' % cover_file.name], **kwargs)
  62     os.unlink(cover_file.name)
  63     return OutputFile.from_filename(output_file.name)