'Audio'get using youtube-dl. Like wget, except for extracting and saving audio from music/audio videos

aget

#!/bin/bash

# DEPENDENCIES
# apt-get install ffmpeg id3v2
# install youtube-dl from github

# trim a filepath to only get filename, ${1} is filepath
function trimFilename
{
        last=0
        while :; do
                i=$(/usr/bin/expr index "${1:${last}}" '/')
                if [ "${i}" -eq 0 ]; then
                        break
                else
                        last=$(/usr/bin/expr "${i}" + "${last}") # keep the indexes correct
                fi
        done
        filename="${1:${last}}"
}

# ${1} is filepath
function createTags 
{
        filepath="${1}"
        trimFilename "${filepath}"

        prevIndex=0 # index of the previously found -
        while :; do
                # if $i == 0, char not found, else $i is index of char
                i=$(/usr/bin/expr index "${filename:${prevIndex}}" '-')
                if [ "${i}" -ne 0 ]; then
                        i=$(/usr/bin/expr "${i}" + "${prevIndex}") # keep the indexes correct
                        right="${i}" # index after - based on 0
                        # left=$(/usr/bin/expr "${i}" - 1) # minus one to get index starting from 0 for before -
                        left="${i}" # minus one to get index starting from 0 for before -

                        #remove space
                        if [ "${filename:${left}:1}" == ' ' ]; then
                                left=$(/usr/bin/expr "${left}" - 2)
                        else
                                left=$(/usr/bin/expr "${left}" - 1)
                        fi
                        if [ "${filename:${right}:1}" == ' ' ]; then
                                right=$(/usr/bin/expr "${right}" + 1)
                        fi
                        title="${filename:${right}: -4}" # right of - and trim .mp3 ext
                        artist="${filename:0:${left}}"
                        prevIndex="${right}"
                        echo -e "\nFile: \e[4;31;46m${artist}\e[0m\e[4;31m - \e[4;31;42m${title}\e[0m\e[4;31m.mp3\e[0m"
                        /bin/echo -e "Are these tags correct?"
                        /bin/echo -e "\e[1;34mArtist:\e[0m ${artist}"
                        /bin/echo -e "\e[1;32mTitle:\e[0m ${title}"
                        /bin/echo -n "y or n: "
                        read ans
                        if [ "${ans}" == 'y' ]; then
                                break
                        fi
                else
                        /bin/echo -n 'Enter Artist: '
                        read artist
                        /bin/echo -n 'Enter Title: '
                        read title
                        break
                fi
        done

        id3v2 -a "${artist}" -t "${title}" "${filepath}"
}


# dir where files will be stored
storePath="${HOME}/Downloads/Audio Downloads/"

# create directory where files will be stored if doesn't exist
if [ ! -d "${storePath}" ]; then
        /bin/mkdir -v -p "${storePath}"
fi

if [ $# -eq 0 ]; then
        /bin/echo "ERROR: Need atleast 1 URL."
        exit 1
fi

error=0

for url in "$@"
do
        bestVidFormat=$(/usr/local/bin/youtube-dl -F "$url" | /usr/bin/tail -n 1) 
        /bin/echo "Best format: ${bestVidFormat}"
        bestVidFormat=$(/bin/echo "${bestVidFormat}" | cut -d ' ' -f 1)
        /usr/local/bin/youtube-dl -x --no-playlist --audio-quality 0 --audio-format mp3 -o "%(title)s.%(ext)s" "$url" 
        #/usr/local/bin/youtube-dl --audio-quality 0 --audio-format best -o "%(title)s.%(ext)s" --max-quality "${bestVidFormat}" "$url" 
        if [ $? -gt 0 ]; then # error downloading, skip
                error=1
                continue
        fi
        # Name of actual file when downloaded, will be mp3
        downloadedFileName=`/bin/ls --sort time --time ctime | /usr/bin/head -n 1`
        # Path where file is downloaded, current directory when script was executed (assuming had permission to write to this dir)
        downloadedPath=`/bin/pwd`
        downloadedFullPath="${downloadedPath}/${downloadedFileName}"
        # Just the file name, without an extension
        /bin/mv "${downloadedFullPath}" "${storePath}"
        createTags "${storePath}/$downloadedFileName"
done

if [[ ${error} -eq 1 ]]; then
        echo "There has been an error with a download."
        exit 1
fi

exit 0