librarian/epub.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 __future__ import with_statement
   7
   8 import os
   9 import os.path
  10 import re
  11 import subprocess
  12 from StringIO import StringIO
  13 from copy import deepcopy
  14 from lxml import etree
  15 import zipfile
  16 from tempfile import mkdtemp, NamedTemporaryFile
  17 from shutil import rmtree
  18 from mimetypes import guess_type
  19
  20 from librarian import RDFNS, WLNS, NCXNS, OPFNS, XHTMLNS, OutputFile
  21 from librarian.cover import WLCover, FutureOfCopyrightCover
  22
  23 from librarian import functions, get_resource
  24
  25 functions.reg_person_name()
  26
  27
  28 def inner_xml(node):
  29     """ returns node's text and children as a string
  30
  31     >>> print inner_xml(etree.fromstring('<a>x<b>y</b>z</a>'))
  32     x<b>y</b>z
  33     """
  34
  35     nt = node.text if node.text is not None else ''
  36     return ''.join([nt] + [etree.tostring(child) for child in node])
  37
  38 def set_inner_xml(node, text):
  39     """ sets node's text and children from a string
  40
  41     >>> e = etree.fromstring('<a>b<b>x</b>x</a>')
  42     >>> set_inner_xml(e, 'x<b>y</b>z')
  43     >>> print etree.tostring(e)
  44     <a>x<b>y</b>z</a>
  45     """
  46
  47     p = etree.fromstring('<x>%s</x>' % text)
  48     node.text = p.text
  49     node[:] = p[:]
  50
  51
  52 def node_name(node):
  53     """ Find out a node's name
  54
  55     >>> print node_name(etree.fromstring('<a>X<b>Y</b>Z</a>'))
  56     XYZ
  57     """
  58
  59     tempnode = deepcopy(node)
  60
  61     for p in ('pe', 'pa', 'pt', 'pr', 'motyw'):
  62         for e in tempnode.findall('.//%s' % p):
  63             t = e.tail
  64             e.clear()
  65             e.tail = t
  66     etree.strip_tags(tempnode, '*')
  67     return tempnode.text
  68
  69
  70 def xslt(xml, sheet):
  71     if isinstance(xml, etree._Element):
  72         xml = etree.ElementTree(xml)
  73     with open(sheet) as xsltf:
  74         return xml.xslt(etree.parse(xsltf))
  75
  76
  77 def replace_characters(node):
  78     def replace_chars(text):
  79         if text is None:
  80             return None
  81         return text.replace(u"\ufeff", u"")\
  82                    .replace("---", u"\u2014")\
  83                    .replace("--", u"\u2013")\
  84                    .replace(",,", u"\u201E")\
  85                    .replace('"', u"\u201D")\
  86                    .replace("'", u"\u2019")
  87     if node.tag in ('uwaga', 'extra'):
  88         t = node.tail
  89         node.clear()
  90         node.tail = t
  91     node.text = replace_chars(node.text)
  92     node.tail = replace_chars(node.tail)
  93     for child in node:
  94         replace_characters(child)
  95
  96
  97 def find_annotations(annotations, source, part_no):
  98     for child in source:
  99         if child.tag in ('pe', 'pa', 'pt', 'pr'):
 100             annotation = deepcopy(child)
 101             number = str(len(annotations)+1)
 102             annotation.set('number', number)
 103             annotation.set('part', str(part_no))
 104             annotation.tail = ''
 105             annotations.append(annotation)
 106             tail = child.tail
 107             child.clear()
 108             child.tail = tail
 109             child.text = number
 110         if child.tag not in ('extra', 'uwaga'):
 111             find_annotations(annotations, child, part_no)
 112
 113
 114 class Stanza(object):
 115     """
 116     Converts / verse endings into verse elements in a stanza.
 117
 118     Slashes may only occur directly in the stanza. Any slashes in subelements
 119     will be ignored, and the subelements will be put inside verse elements.
 120
 121     >>> s = etree.fromstring("<strofa>a <b>c</b> <b>c</b>/\\nb<x>x/\\ny</x>c/ \\nd</strofa>")
 122     >>> Stanza(s).versify()
 123     >>> print etree.tostring(s)
 124     <strofa><wers_normalny>a <b>c</b> <b>c</b></wers_normalny><wers_normalny>b<x>x/
 125     y</x>c</wers_normalny><wers_normalny>d</wers_normalny></strofa>
 126
 127     """
 128     def __init__(self, stanza_elem):
 129         self.stanza = stanza_elem
 130         self.verses = []
 131         self.open_verse = None
 132
 133     def versify(self):
 134         self.push_text(self.stanza.text)
 135         for elem in self.stanza:
 136             self.push_elem(elem)
 137             self.push_text(elem.tail)
 138         tail = self.stanza.tail
 139         self.stanza.clear()
 140         self.stanza.tail = tail
 141         self.stanza.extend(self.verses)
 142
 143     def open_normal_verse(self):
 144         self.open_verse = self.stanza.makeelement("wers_normalny")
 145         self.verses.append(self.open_verse)
 146
 147     def get_open_verse(self):
 148         if self.open_verse is None:
 149             self.open_normal_verse()
 150         return self.open_verse
 151
 152     def push_text(self, text):
 153         if not text:
 154             return
 155         for i, verse_text in enumerate(re.split(r"/\s*\n", text)):
 156             if i:
 157                 self.open_normal_verse()
 158             verse = self.get_open_verse()
 159             if len(verse):
 160                 verse[-1].tail = (verse[-1].tail or "") + verse_text
 161             else:
 162                 verse.text = (verse.text or "") + verse_text
 163
 164     def push_elem(self, elem):
 165         if elem.tag.startswith("wers"):
 166             verse = deepcopy(elem)
 167             verse.tail = None
 168             self.verses.append(verse)
 169             self.open_verse = verse
 170         else:
 171             appended = deepcopy(elem)
 172             appended.tail = None
 173             self.get_open_verse().append(appended)
 174
 175
 176 def replace_by_verse(tree):
 177     """ Find stanzas and create new verses in place of a '/' character """
 178
 179     stanzas = tree.findall('.//' + WLNS('strofa'))
 180     for stanza in stanzas:
 181         Stanza(stanza).versify()
 182
 183
 184 def add_to_manifest(manifest, partno):
 185     """ Adds a node to the manifest section in content.opf file """
 186
 187     partstr = 'part%d' % partno
 188     e = manifest.makeelement(OPFNS('item'), attrib={
 189                                  'id': partstr,
 190                                  'href': partstr + '.html',
 191                                  'media-type': 'application/xhtml+xml',
 192                              })
 193     manifest.append(e)
 194
 195
 196 def add_to_spine(spine, partno):
 197     """ Adds a node to the spine section in content.opf file """
 198
 199     e = spine.makeelement(OPFNS('itemref'), attrib={'idref': 'part%d' % partno});
 200     spine.append(e)
 201
 202
 203 class TOC(object):
 204     def __init__(self, name=None, part_href=None):
 205         self.children = []
 206         self.name = name
 207         self.part_href = part_href
 208         self.sub_number = None
 209
 210     def add(self, name, part_href, level=0, is_part=True, index=None):
 211         assert level == 0 or index is None
 212         if level > 0 and self.children:
 213             return self.children[-1].add(name, part_href, level-1, is_part)
 214         else:
 215             t = TOC(name)
 216             t.part_href = part_href
 217             if index is not None:
 218                 self.children.insert(index, t)
 219             else:
 220                 self.children.append(t)
 221             if not is_part:
 222                 t.sub_number = len(self.children) + 1
 223                 return t.sub_number
 224
 225     def append(self, toc):
 226         self.children.append(toc)
 227
 228     def extend(self, toc):
 229         self.children.extend(toc.children)
 230
 231     def depth(self):
 232         if self.children:
 233             return max((c.depth() for c in self.children)) + 1
 234         else:
 235             return 0
 236
 237     def href(self):
 238         src = self.part_href
 239         if self.sub_number is not None:
 240             src += '#sub%d' % self.sub_number
 241         return src
 242
 243     def write_to_xml(self, nav_map, counter=1):
 244         for child in self.children:
 245             nav_point = nav_map.makeelement(NCXNS('navPoint'))
 246             nav_point.set('id', 'NavPoint-%d' % counter)
 247             nav_point.set('playOrder', str(counter))
 248
 249             nav_label = nav_map.makeelement(NCXNS('navLabel'))
 250             text = nav_map.makeelement(NCXNS('text'))
 251             text.text = child.name
 252             nav_label.append(text)
 253             nav_point.append(nav_label)
 254
 255             content = nav_map.makeelement(NCXNS('content'))
 256             content.set('src', child.href())
 257             nav_point.append(content)
 258             nav_map.append(nav_point)
 259             counter = child.write_to_xml(nav_point, counter + 1)
 260         return counter
 261
 262     def html_part(self, depth=0):
 263         texts = []
 264         for child in self.children:
 265             texts.append(
 266                 "<div style='margin-left:%dem;'><a href='%s'>%s</a></div>" %
 267                 (depth, child.href(), child.name))
 268             texts.append(child.html_part(depth+1))
 269         return "\n".join(texts)
 270
 271     def html(self):
 272         with open(get_resource('epub/toc.html')) as f:
 273             t = unicode(f.read(), 'utf-8')
 274         return t % self.html_part()
 275
 276
 277 def used_chars(element):
 278     """ Lists characters used in an ETree Element """
 279     chars = set((element.text or '') + (element.tail or ''))
 280     for child in element:
 281         chars = chars.union(used_chars(child))
 282     return chars
 283
 284
 285 def chop(main_text):
 286     """ divide main content of the XML file into chunks """
 287
 288     # prepare a container for each chunk
 289     part_xml = etree.Element('utwor')
 290     etree.SubElement(part_xml, 'master')
 291     main_xml_part = part_xml[0] # master
 292
 293     last_node_part = False
 294     for one_part in main_text:
 295         name = one_part.tag
 296         if name == 'naglowek_czesc':
 297             yield part_xml
 298             last_node_part = True
 299             main_xml_part[:] = [deepcopy(one_part)]
 300         elif not last_node_part and name in ("naglowek_rozdzial", "naglowek_akt", "srodtytul"):
 301             yield part_xml
 302             main_xml_part[:] = [deepcopy(one_part)]
 303         else:
 304             main_xml_part.append(deepcopy(one_part))
 305             last_node_part = False
 306     yield part_xml
 307
 308
 309 def transform_chunk(chunk_xml, chunk_no, annotations, empty=False, _empty_html_static=[]):
 310     """ transforms one chunk, returns a HTML string, a TOC object and a set of used characters """
 311
 312     toc = TOC()
 313     for element in chunk_xml[0]:
 314         if element.tag in ("naglowek_czesc", "naglowek_rozdzial", "naglowek_akt", "srodtytul"):
 315             toc.add(node_name(element), "part%d.html" % chunk_no)
 316         elif element.tag in ('naglowek_podrozdzial', 'naglowek_scena'):
 317             subnumber = toc.add(node_name(element), "part%d.html" % chunk_no, level=1, is_part=False)
 318             element.set('sub', str(subnumber))
 319     if empty:
 320         if not _empty_html_static:
 321             _empty_html_static.append(open(get_resource('epub/emptyChunk.html')).read())
 322         chars = set()
 323         output_html = _empty_html_static[0]
 324     else:
 325         find_annotations(annotations, chunk_xml, chunk_no)
 326         replace_by_verse(chunk_xml)
 327         html_tree = xslt(chunk_xml, get_resource('epub/xsltScheme.xsl'))
 328         chars = used_chars(html_tree.getroot())
 329         output_html = etree.tostring(html_tree, method="html", pretty_print=True)
 330     return output_html, toc, chars
 331
 332
 333 def transform(wldoc, verbose=False,
 334               style=None, html_toc=False,
 335               sample=None, cover=None, flags=None, resources=None,
 336               intro_file=None, cover_file=None):
 337     """ produces a EPUB file
 338
 339     sample=n: generate sample e-book (with at least n paragraphs)
 340     cover: a cover.Cover factory or True for default
 341     flags: less-advertising, without-fonts, working-copy
 342     """
 343
 344     def transform_file(wldoc, chunk_counter=1, first=True, sample=None):
 345         """ processes one input file and proceeds to its children """
 346
 347         replace_characters(wldoc.edoc.getroot())
 348
 349         # every input file will have a TOC entry,
 350         # pointing to starting chunk
 351         toc = TOC(wldoc.book_info.title, "part%d.html" % chunk_counter)
 352         chars = set()
 353         if first:
 354             # write book title page
 355             html_tree = xslt(wldoc.edoc, get_resource('epub/xsltTitle.xsl'))
 356             chars = used_chars(html_tree.getroot())
 357             zip.writestr('OPS/title.html',
 358                  etree.tostring(html_tree, method="html", pretty_print=True))
 359             # add a title page TOC entry
 360             toc.add(u"Tytuł", "title.html")
 361         elif wldoc.book_info.parts:
 362             # write title page for every parent
 363             if sample is not None and sample <= 0:
 364                 chars = set()
 365                 html_string = open(get_resource('epub/emptyChunk.html')).read()
 366             else:
 367                 html_tree = xslt(wldoc.edoc, get_resource('epub/xsltChunkTitle.xsl'))
 368                 chars = used_chars(html_tree.getroot())
 369                 html_string = etree.tostring(html_tree, method="html", pretty_print=True)
 370             zip.writestr('OPS/part%d.html' % chunk_counter, html_string)
 371             add_to_manifest(manifest, chunk_counter)
 372             add_to_spine(spine, chunk_counter)
 373             chunk_counter += 1
 374
 375         if len(wldoc.edoc.getroot()) > 1:
 376             # rdf before style master
 377             main_text = wldoc.edoc.getroot()[1]
 378         else:
 379             # rdf in style master
 380             main_text = wldoc.edoc.getroot()[0]
 381             if main_text.tag == RDFNS('RDF'):
 382                 main_text = None
 383
 384         if main_text is not None:
 385             for chunk_xml in chop(main_text):
 386                 empty = False
 387                 if sample is not None:
 388                     if sample <= 0:
 389                         empty = True
 390                     else:
 391                         sample -= len(chunk_xml.xpath('//strofa|//akap|//akap_cd|//akap_dialog'))
 392                 chunk_html, chunk_toc, chunk_chars = transform_chunk(chunk_xml, chunk_counter, annotations, empty)
 393
 394                 toc.extend(chunk_toc)
 395                 chars = chars.union(chunk_chars)
 396                 zip.writestr('OPS/part%d.html' % chunk_counter, chunk_html)
 397                 add_to_manifest(manifest, chunk_counter)
 398                 add_to_spine(spine, chunk_counter)
 399                 chunk_counter += 1
 400
 401         for child in wldoc.parts():
 402             child_toc, chunk_counter, chunk_chars, sample = transform_file(
 403                 child, chunk_counter, first=False, sample=sample)
 404             toc.append(child_toc)
 405             chars = chars.union(chunk_chars)
 406
 407         return toc, chunk_counter, chars, sample
 408
 409
 410     document = deepcopy(wldoc)
 411     del wldoc
 412
 413     if flags:
 414         for flag in flags:
 415             document.edoc.getroot().set(flag, 'yes')
 416
 417     # add editors info
 418     document.edoc.getroot().set('editors', u', '.join(sorted(
 419         editor.readable() for editor in document.editors())))
 420
 421     opf = xslt(document.book_info.to_etree(), get_resource('epub/xsltContent.xsl'))
 422     manifest = opf.find('.//' + OPFNS('manifest'))
 423     guide = opf.find('.//' + OPFNS('guide'))
 424     spine = opf.find('.//' + OPFNS('spine'))
 425
 426     output_file = NamedTemporaryFile(prefix='librarian', suffix='.epub', delete=False)
 427     zip = zipfile.ZipFile(output_file, 'w', zipfile.ZIP_DEFLATED)
 428
 429     # write static elements
 430     mime = zipfile.ZipInfo()
 431     mime.filename = 'mimetype'
 432     mime.compress_type = zipfile.ZIP_STORED
 433     mime.extra = ''
 434     zip.writestr(mime, 'application/epub+zip')
 435     zip.writestr('META-INF/container.xml', '<?xml version="1.0" ?><container version="1.0" ' \
 436                        'xmlns="urn:oasis:names:tc:opendocument:xmlns:container">' \
 437                        '<rootfiles><rootfile full-path="OPS/content.opf" ' \
 438                        'media-type="application/oebps-package+xml" />' \
 439                        '</rootfiles></container>')
 440     zip.write(get_resource('res/wl-logo-small.png'), os.path.join('OPS', 'logo_wolnelektury.png'))
 441     zip.write(get_resource('res/logo.png'), os.path.join('OPS', 'logo.png'))
 442     zip.write(get_resource('res/jedenprocent.png'), os.path.join('OPS', 'jedenprocent.png'))
 443     if not style:
 444         style = get_resource('epub/style.css')
 445     zip.write(style, os.path.join('OPS', 'style.css'))
 446     if resources:
 447         if os.path.isdir(resources):
 448             for dp, dirs, files in os.walk(resources):
 449                 for fname in files:
 450                     fpath  = os.path.join(dp, fname)
 451                     if os.path.isfile(fpath):
 452                         zip.write(fpath, os.path.join('OPS', fname))
 453                         manifest.append(etree.fromstring(
 454                                 '<item id="%s" href="%s" media-type="%s" />' % (os.path.splitext(fname)[0], fname, guess_type(fpath)[0])))
 455
 456         else:
 457             print "resources path %s is not directory" % resources
 458
 459
 460     if cover:
 461         if cover is True:
 462             cover = FutureOfCopyrightCover
 463
 464         cover_file = StringIO()
 465         c = cover(document.book_info)
 466         c.save(cover_file)
 467         c_name = 'cover.%s' % c.ext()
 468         zip.writestr(os.path.join('OPS', c_name), cover_file.getvalue())
 469         del cover_file
 470
 471         cover_tree = etree.parse(get_resource('epub/cover.html'))
 472         cover_tree.find('//' + XHTMLNS('img')).set('src', c_name)
 473         zip.writestr('OPS/cover.html', etree.tostring(
 474                         cover_tree, method="html", pretty_print=True))
 475
 476         if c.uses_dc_cover:
 477             if document.book_info.cover_by:
 478                 document.edoc.getroot().set('data-cover-by', document.book_info.cover_by)
 479             if document.book_info.cover_source:
 480                 document.edoc.getroot().set('data-cover-source', document.book_info.cover_source)
 481
 482         manifest.append(etree.fromstring(
 483             '<item id="cover" href="cover.html" media-type="application/xhtml+xml" />'))
 484         manifest.append(etree.fromstring(
 485             '<item id="cover-image" href="%s" media-type="%s" />' % (c_name, c.mime_type())))
 486         spine.insert(0, etree.fromstring('<itemref idref="cover" linear="no" />'))
 487         opf.getroot()[0].append(etree.fromstring('<meta name="cover" content="cover-image"/>'))
 488         guide.append(etree.fromstring('<reference href="cover.html" type="cover" title="Okładka"/>'))
 489
 490
 491
 492     annotations = etree.Element('annotations')
 493
 494     toc_file = etree.fromstring('<?xml version="1.0" encoding="utf-8"?><!DOCTYPE ncx PUBLIC ' \
 495                                '"-//NISO//DTD ncx 2005-1//EN" "http://www.daisy.org/z3986/2005/ncx-2005-1.dtd">' \
 496                                '<ncx xmlns="http://www.daisy.org/z3986/2005/ncx/" xml:lang="pl" ' \
 497                                'version="2005-1"><head></head><docTitle></docTitle><navMap>' \
 498                                '</navMap></ncx>')
 499     nav_map = toc_file[-1]
 500
 501     manifest.append(etree.fromstring(
 502         '<item id="first" href="first.html" media-type="application/xhtml+xml" />'))
 503     spine.append(etree.fromstring(
 504         '<itemref idref="first" />'))
 505     html_tree = xslt(document.edoc, get_resource('epub/xsltFirst.xsl'))
 506 #    chars.update(used_chars(html_tree.getroot()))
 507     zip.writestr('OPS/first.html', etree.tostring(
 508                         html_tree, method="html", pretty_print=True))
 509
 510     if intro_file:
 511         manifest.append(etree.fromstring(
 512                 '<item id="intro" href="intro.html" media-type="application/xhtml+xml" />'))
 513         spine.append(etree.fromstring(
 514                 '<itemref idref="intro" />'))
 515         zip.writestr('OPS/intro.html', open(intro_file or get_resource('epub/intro.html')).read())
 516
 517
 518     if html_toc:
 519         manifest.append(etree.fromstring(
 520             '<item id="html_toc" href="toc.html" media-type="application/xhtml+xml" />'))
 521         spine.append(etree.fromstring(
 522             '<itemref idref="html_toc" />'))
 523         guide.append(etree.fromstring('<reference href="toc.html" type="toc" title="Table of Contents"/>'))
 524
 525     toc, chunk_counter, chars, sample = transform_file(document, sample=sample)
 526
 527     toc.add("Informacje redakcyjne", "first.html", index=0)
 528
 529     if len(toc.children) < 2:
 530         toc.add(u"Początek książki", "part1.html")
 531
 532     # Last modifications in container files and EPUB creation
 533     if len(annotations) > 0:
 534         toc.add("Przypisy", "annotations.html")
 535         manifest.append(etree.fromstring(
 536             '<item id="annotations" href="annotations.html" media-type="application/xhtml+xml" />'))
 537         spine.append(etree.fromstring(
 538             '<itemref idref="annotations" />'))
 539         replace_by_verse(annotations)
 540         html_tree = xslt(annotations, get_resource('epub/xsltAnnotations.xsl'))
 541         chars = chars.union(used_chars(html_tree.getroot()))
 542         zip.writestr('OPS/annotations.html', etree.tostring(
 543                             html_tree, method="html", pretty_print=True))
 544
 545     # toc.add("Weprzyj Wolne Lektury", "support.html")
 546     # manifest.append(etree.fromstring(
 547     #     '<item id="support" href="support.html" media-type="application/xhtml+xml" />'))
 548     # spine.append(etree.fromstring(
 549     #     '<itemref idref="support" />'))
 550     # html_string = open(get_resource('epub/support.html')).read()
 551     # chars.update(used_chars(etree.fromstring(html_string)))
 552     # zip.writestr('OPS/support.html', html_string)
 553
 554     toc.add("Informacje redakcyjne", "last.html")
 555     manifest.append(etree.fromstring(
 556         '<item id="last" href="last.html" media-type="application/xhtml+xml" />'))
 557     spine.append(etree.fromstring(
 558         '<itemref idref="last" />'))
 559     html_tree = xslt(document.edoc, get_resource('epub/xsltLast.xsl'))
 560     chars.update(used_chars(html_tree.getroot()))
 561     zip.writestr('OPS/last.html', etree.tostring(
 562                         html_tree, method="html", pretty_print=True))
 563
 564     if not flags or not 'without-fonts' in flags:
 565         # strip fonts
 566         tmpdir = mkdtemp('-librarian-epub')
 567         try:
 568             cwd = os.getcwd()
 569         except OSError:
 570             cwd = None
 571
 572         os.chdir(os.path.join(os.path.dirname(os.path.realpath(__file__)), 'font-optimizer'))
 573         for fname in 'DejaVuSerif.ttf', 'DejaVuSerif-Bold.ttf', 'DejaVuSerif-Italic.ttf', 'DejaVuSerif-BoldItalic.ttf':
 574             optimizer_call = ['perl', 'subset.pl', '--chars', ''.join(chars).encode('utf-8'),
 575                               get_resource('fonts/' + fname), os.path.join(tmpdir, fname)]
 576             if verbose:
 577                 print "Running font-optimizer"
 578                 subprocess.check_call(optimizer_call)
 579             else:
 580                 subprocess.check_call(optimizer_call, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
 581             zip.write(os.path.join(tmpdir, fname), os.path.join('OPS', fname))
 582             manifest.append(etree.fromstring(
 583                 '<item id="%s" href="%s" media-type="font/ttf" />' % (fname, fname)))
 584         rmtree(tmpdir)
 585         if cwd is not None:
 586             os.chdir(cwd)
 587
 588     zip.writestr('OPS/content.opf', etree.tostring(opf, pretty_print=True))
 589     title = document.book_info.title
 590     attributes = "dtb:uid", "dtb:depth", "dtb:totalPageCount", "dtb:maxPageNumber"
 591     for st in attributes:
 592         meta = toc_file.makeelement(NCXNS('meta'))
 593         meta.set('name', st)
 594         meta.set('content', '0')
 595         toc_file[0].append(meta)
 596     toc_file[0][0].set('content', ''.join((title, 'WolneLektury.pl')))
 597     toc_file[0][1].set('content', str(toc.depth()))
 598     set_inner_xml(toc_file[1], ''.join(('<text>', title, '</text>')))
 599
 600     # write TOC
 601     if html_toc:
 602         toc.add(u"Spis treści", "toc.html", index=1)
 603         zip.writestr('OPS/toc.html', toc.html().encode('utf-8'))
 604     toc.write_to_xml(nav_map)
 605     zip.writestr('OPS/toc.ncx', etree.tostring(toc_file, pretty_print=True))
 606     zip.close()
 607
 608     return OutputFile.from_filename(output_file.name)