def read_metadata (filename):
filetype = identify_file(filename)
if filetype is None:
return None
parser = find_parser(filetype)
return parser.reader(filename)
def read_processed_metadata (filename, filetype=None):
if filetype is None:
filetype = identify_file(filename)
if filetype is None:
return None
parser = find_parser(filetype)
return parser.processor(parser.reader(filename))
def write_metadata (filename, metadata):
filetype = identify_file(filename)
if filetype is None:
raise ParserException('Unknown file type: %s' % filename)
if filetype != metadata.filetype:
raise ParserException('Metadata is not for this file type: %s' % filename)
parser = find_parser(filetype)
if parser.writer is None:
raise ParserException('Cannot write metadata for this file type: %s' % filename)
return parser.writer(filename, metadata)
def ebook_metadata (filename):
filetype = identify_file(filename)
if not is_ebook(filetype):
return None
return read_processed_metadata(filename, filetype=filetype)
