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 DefaultEbookCover
  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 factory overriding default
  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 = DefaultEbookCover
  33     cover_file = NamedTemporaryFile(suffix='.png', delete=False)
  34     bound_cover = cover(book_info)
  35     bound_cover.save(cover_file)
  36
  37     if bound_cover.uses_dc_cover:
  38         if document.book_info.cover_by:
  39             document.edoc.getroot().set('data-cover-by', document.book_info.cover_by)
  40         if document.book_info.cover_source:
  41             document.edoc.getroot().set('data-cover-source', document.book_info.cover_source)
  42
  43     if not flags:
  44         flags = []
  45     flags = list(flags) + ['with-full-fonts']
  46     epub = document.as_epub(verbose=verbose, sample=sample, html_toc=True,
  47             flags=flags, style=get_resource('epub/style.css'))
  48
  49     if verbose:
  50         kwargs = {}
  51     else:
  52         devnull = open("/dev/null", 'w')
  53         kwargs = {"stdout": devnull, "stderr": devnull}
  54
  55     output_file = NamedTemporaryFile(prefix='librarian', suffix='.mobi', delete=False)
  56     output_file.close()
  57     subprocess.check_call(['ebook-convert', epub.get_filename(), output_file.name,
  58             '--no-inline-toc', '--mobi-file-type=both', '--subset-embedded-fonts', '--mobi-ignore-margins', '--cover=%s' % cover_file.name], **kwargs)
  59     os.unlink(cover_file.name)
  60     return OutputFile.from_filename(output_file.name)