base to build an etl music tagger

metadata.py

#!/usr/bin/env python3
import argparse
import re
from pathlib import Path
from subprocess import run

DEFAULT_PATTERN = re.compile(r'^(?P<track>\d+)---(?P<title>.+) - (?P<album>.+)---(?P<video_id>.+)\.opus$')

def extract_meta_from_path(full_path, pattern):
    tentative_match = pattern.match(full_path.name)

    if hasattr(tentative_match, 'groupdict'):
        match = tentative_match.groupdict()
    else:
        raise ValueError(f'"{path}" does not match "{pattern.pattern}"')
    match['album'] = 'Devilman Crybaby (2018) OST'

    return match

def write_meta(full_path, meta):
    fresh_file_name = f'{meta["album"]} - {meta["track"]} - {meta["title"]}' + full_path.suffix
    run([
        'ffmpeg', '-i', full_path,
        '-metadata', f'title=\"{meta["title"]}\"',
        '-metadata', f'track={int(meta["track"])}',
        '-metadata', f'album=\"{meta["album"]}\"',
        Path('out', fresh_file_name)
        ])


def main():
    p = argparse.ArgumentParser()
    p.add_argument('path', type=Path)

    args = p.parse_args()

    meta = extract_meta_from_path(args.path, DEFAULT_PATTERN)
    write_meta(args.path, meta)

if __name__ == '__main__':
    main()