Current File : //usr/lib/calibre/calibre/ebooks/conversion/plugins/djvu_input.py
__license__ = 'GPL 3'
__copyright__ = '2011, Anthon van der Neut <anthon@mnt.org>'
__docformat__ = 'restructuredtext en'
import os
from io import BytesIO
from calibre.customize.conversion import InputFormatPlugin
class DJVUInput(InputFormatPlugin):
name = 'DJVU Input'
author = 'Anthon van der Neut'
description = _('Convert OCR-ed DJVU files (.djvu) to HTML')
file_types = {'djvu', 'djv'}
commit_name = 'djvu_input'
def convert(self, stream, options, file_ext, log, accelerators):
from calibre.ebooks.txt.processor import convert_basic
stdout = BytesIO()
from calibre.ebooks.djvu.djvu import DJVUFile
x = DJVUFile(stream)
x.get_text(stdout)
raw_text = stdout.getvalue()
if not raw_text:
raise ValueError('The DJVU file contains no text, only images, probably page scans.'
' calibre only supports conversion of DJVU files with actual text in them.')
html = convert_basic(raw_text.replace(b"\n", b' ').replace(
b'\037', b'\n\n'))
# Run the HTMLized text through the html processing plugin.
from calibre.customize.ui import plugin_for_input_format
html_input = plugin_for_input_format('html')
for opt in html_input.options:
setattr(options, opt.option.name, opt.recommended_value)
options.input_encoding = 'utf-8'
base = os.getcwd()
htmlfile = os.path.join(base, 'index.html')
c = 0
while os.path.exists(htmlfile):
c += 1
htmlfile = os.path.join(base, 'index%d.html'%c)
with open(htmlfile, 'wb') as f:
f.write(html.encode('utf-8'))
odi = options.debug_pipeline
options.debug_pipeline = None
# Generate oeb from html conversion.
with open(htmlfile, 'rb') as f:
oeb = html_input.convert(f, options, 'html', log,
{})
options.debug_pipeline = odi
os.remove(htmlfile)
# Set metadata from file.
from calibre.customize.ui import get_file_type_metadata
from calibre.ebooks.oeb.transforms.metadata import meta_info_to_oeb_metadata
mi = get_file_type_metadata(stream, file_ext)
meta_info_to_oeb_metadata(mi, oeb.metadata, log)
return oeb
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