index-music

#!/bin/bash
#    index-music: a simple script for creating an index of music files dowloaded using youtube-music
#
#    Copyright (C) 2022 mini_bomba
#
#    This program is free software: you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation, either version 3 of the License, or
#    (at your option) any later version.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program.  If not, see <https://www.gnu.org/licenses/>.
FAIL=0
if YTDL=$(which yt-dlp)
then
    echo "Using yt-dlp" >&2
elif YTDL=$(which youtube-dl)
then
    echo "yt-dlp not found; using fallback youtube-dl." >&2
    echo "Consider installing yt-dlp if you experience throttling." >&2
else
    echo "Missing required dependency: yt-dlp" >&2
    FAIL=1
fi
export YTDL
if ! which grep > /dev/null 2>&1
then
    echo "Missing required dependency: grep" >&2
    FAIL=1
fi
if ! which jq > /dev/null 2>&1
then
    echo "Missing required dependency: jq" >&2
    FAIL=1
fi
if ! which xargs > /dev/null 2>&1
then
    echo "Missing required dependency: xargs" >&2
    FAIL=1
fi
if ! which sort > /dev/null 2>&1
then
    echo "Missing required dependency: sort" >&2
    FAIL=1
fi

if [ $FAIL -ne 0 ]
then
    exit 1
fi
function index-file() {
    if echo $1 | grep -Pv '^[[:alnum:]_-]{11}\.mp3$' > /dev/null
    then
        echo "$1 Invalid youtube ID"
        return
    fi
    ID=${1:0:-4}
    DATA=$($YTDL --skip-download --print-json --no-warnings "https://youtu.be/$ID" | jq -r '.title')
    if [[ -z "$DATA" ]]
    then
        echo "$1 Private or invalid youtube video"
    else
        echo "$1 $DATA"
    fi
}
export -f index-file

ls | xargs -P $(grep -c ^processor /proc/cpuinfo) -n 1 -d "\n" -r bash -c 'index-file "$0"' | sort