ocr/hocr-combine

#!/usr/bin/env python3.7
# coding=utf-8

""""Combine multiple hOCR files."""

from argparse import ArgumentParser
from lxml import html


parser = ArgumentParser(description='Combine multiple hOCR files.')
parser.add_argument('file', help='Input file(s)', nargs='+')
parser.add_argument('-o', '--output-file', help='Output file', required=True)
args = parser.parse_args()


for file in args.file:
    files = []
    if file.startswith('@'):
        with open(file[1:], 'r') as f:
            files += [x for x in f.read().split("\n") if x != '']
    else:
        files.append(file)
if len(files) == 0:
    exit(1)


hocr = html.parse(files[0])
hocr_body = hocr.find('body')
for file in files[1:]:
    for ocr_page in html.parse(file).findall('//div[@class="ocr_page"]'):
        hocr_body.append(ocr_page)


with open(args.output_file, 'wb') as f:
    hocr.write(f, encoding='UTF-8', method='html')