#!/bin/bash
# Recursively gets into each folder, checks if there is an audio file
# and extracts the cover with ffmpeg

### Helpers

# Check all extensions available
# find . -type f | perl -ne 'print $1 if m/\.([^.\/]+)$/' | sort -u


export MUSIC_PATH="."

extract_cover()
{
    if [ ! -f "cover.jpg" ]
    then
        ffmpeg -hide_banner -i "$1" cover.jpg
    else
        echo "cover.jpg exists in " $(pwd)
    fi
}

export -f extract_cover

if [ "$#" -eq 1 ]; then
    export MUSIC_PATH=$1
fi

find $MUSIC_PATH \( -iname \*.MP3 -o -iname \*.Mp3 -o -iname \*.mp3 -o -iname \*.m4a \) -type f -execdir bash -c 'extract_cover "$0"' {} \;