extract_yt_playlist.sh

#!/bin/bash

if [ -z "$1" ];
then
	echo "Please, specify the playlist code as argument" 1>&2
	exit 1
fi
URL="https://www.youtube.com/playlist?list=$1"
YOUTUBE_VIDEO_URL_PREFIX="https:\/\/youtube.com\/watch?v="
OUT_FILE="playlist_extracted.md"

withnames=true
if [[ "withnames" = "withnames" ]];
then
	withnames=true
fi
TMPFILE=$(mktemp "/tmp/$0.tmp.XXXXXX") || {
	echo "Temporary file creation failed" 1>&2
	exit 1
}

COMMAND=""
if [[ -n $(type -p wget) ]];
then
	COMMAND="wget -o /dev/null -O '$TMPFILE' '$URL'"
fi
if [ -z "$COMMAND" ] && [[ -n $(type -p curl) ]];
then
	COMMAND="curl -s -o '$TMPFILE' '$URL'"
fi
if [ -z "$COMMAND" ];
then
	echo "Please, install wget or curl to use this script" 1>&2
	exit 1
fi

eval "$COMMAND"

if $withnames;
then
	grep -o -P '"videoId":"[^"]+","thumb|\}\]\},"title":\{"runs":\[\{"text":"([^"]+)"' $TMPFILE | head -n -1 | sed 's/.*:\|,"thumb\|"//g' | sed 'N;s/^//g' | sed -rz 's/\n([^\n]*\n)/\t\1/g' | sed "s/^/$YOUTUBE_VIDEO_URL_PREFIX/g" > $OUT_FILE
else
	grep -o -P '"videoId":"[^"]+","thumb' $TMPFILE | head -n -1 | sed 's/.*:\|,"thumb\|"//g' | sed "s/^/$YOUTUBE_VIDEO_URL_PREFIX/g" > $OUT_FILE
fi

CONTINUATION=$(grep 'continuation=' $TMPFILE | head -n1 | cut -d ';' -f2-3 | cut -d '"' -f 1 | cut -d '\' -f1)

while [[ "$CONTINUATION" =~ ^continuation.* ]]
do
	URL='https://www.youtube.com/browse_ajax?action_continuation=1&'$CONTINUATION

	if [[ -n $(type -p wget) ]];
	then
		wget -o /dev/null -O "$TMPFILE" "$URL"
	else
		curl -s -o "$TMPFILE" "$URL"
	fi
	if $withnames;
	then
		sed 's/\\n/\'$'\n''/g' "$TMPFILE" | grep -e "data-title=" | sed 's/.*data-title=\\"/\'$'\n''/g'| sed 's/\\"/\'$'\n''/'| sed 's/.*watch/https:\/\/www.youtube.com\//g'| sed 's/\\u0026amp.*//g' | grep -v '^$' >> "playlist_$1.txt"
	else
		tr -s '\\|/' '\n' < "$TMPFILE" | grep "^watch" | sed 's/\\u0026amp;\(.*\)//g' | sed 's/watch/https:\/\/www.youtube.com\/watch/g' | sort -u >> "playlist_$1.txt"
	fi

	CONTINUATION=$(sed 's/action_continuation=1\\u0026amp;/\'$'\n''/g' $TMPFILE | tail -n1 | cut -d '\' -f1)
done

rm -f $TMPFILE

COUNTER=0
while IFS= read -r line
do
	COUNTER=$(( $COUNTER + 1 ))
	link=$(echo $line | awk '{print $1}')
	link_id=$(echo $link | sed 's/https:\/\/youtube.com\/watch?v=//g')	
	title=$(echo $line | awk '{$1=""; print $0}' | sed 's/^ //g') 
	TEXT="""\n- - -\n# $COUNTER. $title\n
<iframe allowfullscreen='allowfullscreen'\n\t
		mozallowfullscreen='mozallowfullscreen'\n\t
		msallowfullscreen='msallowfullscreen'\n\t
		oallowfullscreen='oallowfullscreen'\n\t
		webkitallowfullscreen='webkitallowfullscreen'\n\t
		width='560' height='315'\n\t
		frameborder='0'\n\t
		allow='accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture'\n\t
		src='https://www.youtube.com/embed/${link_id}'>\n
</iframe>\n"""
	if [[ $link_id != "Descrição" ]];
	then
		echo -ne $TEXT >> playlist_converted.md
	fi
done < "$OUT_FILE"

rm -rf $OUT_FILE