import glob
import sys
import subprocess

letter_year = sys.argv[1]
fn_stem = sys.argv[2]

files = glob.glob(f"{letter_year}/{fn_stem}-???.wav")
files.sort()

with open(f"./{letter_year}/inputs-{letter_year}.txt", "x") as f:
    for file in files:
        f.write(f"file {file}'\n")
    f.flush()

subprocess.run([
    "ffmpeg",
    "-f", "concat",
    "-safe", "0",
    "-i", f"./{letter_year}/inputs-{letter_year}.txt",
    "-c", "copy", f"./{letter_year}/{fn_stem}-{letter_year}.wav",
    ])