Scrapbox exported data convert to text files (Abridged edition)

sb2txt.py

#!/usr/bin/env python3
import argparse
import logging
import os
import sys
import json
import re

logging.basicConfig(
    level=logging.INFO,
    stream=sys.stderr,
)

parser = argparse.ArgumentParser(
    prog="Scrapbox to Text",
    description="Exported Scrapbox data convert to text files.",
)
parser.add_argument("filename", type=argparse.FileType("r"))
parser.add_argument("-o", "--output", help="Output folder")
# parser.add_argument("-v", "--verbose", action="store_true")


if __name__ == '__main__':
    args = parser.parse_args()
    try:
        data = json.load(args.filename)
    except json.JSONDecodeError:
        logging.critical("JSON decode error.", exc_info=sys.exc_info())
        sys.exit(1)

    if args.output is None:
        base_folder = os.path.splitext(os.path.basename(args.filename.name))[0]
    else:
        base_folder = args.output

    try:
        os.makedirs(base_folder, exist_ok=False)
        os.chdir(base_folder)
    except FileExistsError:
        logging.critical("Base folder is already exists.")
        sys.exit(1)

    for dp in data["pages"]:
        export_filename = re.sub(r'[\\/:*?"<>|]+', '-', f"{dp['title']}.txt")
        with open(export_filename, mode="w", encoding="utf-8") as fs:
            fs.write("\n".join(dp["lines"][1:]))
        logging.info(f"Exported: {export_filename}")