#!/bin/sh

cd "$(dirname "$0")"

CHAPTER="$1"

if test -z "$CHAPTER" || test -f "audio/$CHAPTER.mp3"; then
    echo "Usage: $0 <chapter>" >&2
    exit 1
fi

sox part* output.wav
ffmpeg -i output.wav audio/$CHAPTER.mp3

if [ $? -eq 0 ]; then
    rm output.wav part*.wav
fi

echo "Done"