youtube-mp3 () {
# get mp3 from youtube video
# Author: Sergio Luiz Araujo Silva
# site: http://vivaotux.blogspot.com
# mail: voyeg3r [gmail]
# twititer: @voyeg3r
# Instalation: put thins function in your ~/.bashrc

    # testing parameters
    if [ $# -eq 0 ] ; then
        echo -e '\n\tUSAGE: youtube-mp3 youtube-link\n'
        return 0
    fi

    # testing existence of programs
    NEEDED_COMMANDS="youtube-dl ffmpeg"
    missing_counter=0
    for needed_command in $NEEDED_COMMANDS; do
        if ! hash "$needed_command" >/dev/null 2>&1; then
            printf "Command not found in PATH: %s\n" "$needed_command" >&2
            ((missing_counter++))
        fi
    done
    if ((missing_counter > 0)); then
        sudo apt-get install -y $NEEDED_COMMANDS
    fi

    # geting video and converting with ffmpeg
    youtube-dl --restrict-filenames -x --audio-format=mp3 --audio-quality 320k  "${1}"
}