kunst/kunst

#!/usr/bin/env bash
# ┬┌─┬ ┬┌┐┌┌─┐┌┬┐
# ├┴┐│ ││││└─┐ │ 
# ┴ ┴└─┘┘└┘└─┘ ┴ 
# Created by Siddharth Dushantha

# VERSION=1.0

COVER=/tmp/kunst.jpg
MUSIC_DIR=~/Music/

# this is a base64 endcoded image which will be used if
# if the file does not have an emmbeded album art.
# the image is a image of a music note
read -d '' MUSIC_NOTE << EOF
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
EOF


update_cover() {
	# extract the album art from the mp3 file and dont show the messsy
	# output of ffmpeg
	ffmpeg -i "$MUSIC_DIR$(mpc current -f %file%)" $COVER -y &> /dev/null

    # get the status of the previous command
	STATUS=$?

    # check if the file has a embbeded album art
	if [ $STATUS -eq 0 ];then
		echo "kunst: extracted album art"
		ARTLESS=false
	else
	    echo "error: file does not have an album art"
		ARTLESS=true
		return
	fi

	# resize the image to 250x250
	convert $COVER -resize 250x250 $COVER 

	echo "kunst: resized album art to 250x250"
}


main() {
	update_cover

	if [ $ARTLESS == true ];then
	    # change the path to COVER because the music note
		# image is a png not jpg
	    COVER=/tmp/kunst.png

		# decode the base64 encoded image and save it
		# to /tmp/kunst.png
		echo "$MUSIC_NOTE" | base64 --decode > $COVER
	fi
	
	echo "kunst: swapped album art to $(mpc current)"

	# display the album art using sxiv
	sxiv -g 250x250 -b $COVER &

	while true; do
	    # waiting for an event from mpd; play/pause/next/previous
	    # this is lets kunst use less CPU :)
	    mpc idle &> /dev/null
		echo "kunst: received event from mpd"

		update_cover

		if [ $ARTLESS == true ];then
			# change the path to COVER because the music note
			# image is a png not jpg
			COVER=/tmp/kunst.png

			# decode the base64 encoded image and save it
			# to /tmp/kunst.png
			echo "$MUSIC_NOTE" | base64 --decode > $COVER
		fi

		echo "kunst: swapped album art to $(mpc current)"
	done
}


main