import subprocess
from typing import Optional

def metadata_list(db, prefix: Optional[str] = None) -> list[str]:
    cmdline = ['xapian-metadata', 'list', db]
    if prefix:
        cmdline.append(prefix)
    cmd = subprocess.run(cmdline, capture_output=True, text=True)
    return cmd.stdout.split('\n')


def metadata_get(db, key: str) -> str:
    cmd = subprocess.run(['xapian-metadata', 'get', db, key],
                         capture_output=True, text=True)
    return cmd.stdout.strip()