#!/bin/bash
#                      /usr/local/bin/youtube2mp3
# http://crystalfaeries.net/posix/bin/youtube2mp3
# celeste:crystalfaery 2015-11-15 15:16:41+00:00
# Reviewing this code today, it is obvious:
# It is old, as now youtube-dl can download just audio.
# I did not write this, but don't remember its source.
# It is a worthy example of using zenity, something I have not learned yet.
# Is zenity current and preferred, I recall maybe 2 or 3 other equivalents?
# In summary, a good coding example, but now an obsolete solution to downloading audio.

address=$(zenity --width=600 --height=150 --entry --title="YouTube MP3 Extractor" --text "Enter Youtube address (then click OK and then select the destination directory for your MP3 file):")
return_code=$?
regex='v=(.*)'
dest_dir=$(zenity --file-selection --directory)
if [[ $return_code -eq 0 ]]; then
      if [[ $address =~ $regex ]]; then
               video_id=${BASH_REMATCH[1]}
             video_id=$(echo $video_id | cut -d'&' -f1)
              video_title="$(youtube-dl --get-title $address)"
                youtube-dl $address

                if [ -e $video_id.flv ]; then
                   ext="flv"
               fi

                if [ -e $video_id.mp4 ]; then
                   ext="mp4"
               fi

                ffmpeg -i $video_id.$ext /tmp/"$video_title".wav
                lame /tmp/"$video_title".wav $dest_dir/"$video_title".mp3
               rm $video_id.$ext /tmp/"$video_title".wav

            zenity --width=260 --height=130 --title "YouTube MP3 Extractor" --info --text "Your MP3 file is ready."
     else
            zenity --error --text "Sorry but the system encountered a problem. Please check your YouTube address and try again later..."
    fi
fi