traslate body of vnt file to txt file

vnt_to_txt.py

"""
    decode vnt file body text into txt file
"""
import glob
import quopri

# ref: [RFC1521: 5.1. Quoted-Printable Content-Transfer-Encoding](https://www.ietf.org/rfc/rfc1521.txt)


if __name__ == "__main__":
    head = "BODY;CHARSET=Shift_JIS;ENCODING=QUOTED-PRINTABLE:"
    end = "CATEGORIES:"
    for path in glob.glob("./memo*"):
        print(path)
        name = path[2 : len(path) - 4]
        with open(path, encoding="utf-8") as f:
            body = ""
            # search body text
            for line in f:
                if line.startswith(head) or body != "":
                    if line.startswith(end):
                        break
                    # trim
                    line = line.strip()
                    if line.endswith("="):
                        line = line[:-1]
                    body += line
            out = body.replace(head, "")
            out = quopri.decodestring(out.encode("utf-8"))
            out = out.decode("shift-jis")
            with open(f"./{name}.txt", encoding="utf-8", mode="wt") as fout:
                fout.write(out)