observe.sh

#!/bin/sh

[ $2 != "playing" ] && exit 0

# file_path=$(echo "$@" | grep -o  "file .*\...." | sed s/file\ //) # Does not always work?
# file_path=$(echo "$@" | sed -e 's/^.*file //; s/artist.*$//') # new sed command
file_path=$(echo "$@" | sed -e 's/.*file \(.*\) artist.*/\1/') # Experimental!

# try albumartist instead of artist
if [ "$file_path" = "$@" ] ;then
    file_path=$(echo "$@" | sed -e 's/.*file \(.*\) albumartist.*/\1/')
fi

ffmpeg -y -i "${file_path}" -an -vcodec copy ~/.config/cmus/cmus-cover-art/.cover/cover.jpg
# cue files don't support embedded covers
if [ $? -ne 0 ]; then
    # extract the first thing that looks like a path
    cue=$(dirname "$(echo ${file_path} | grep -o '/\w.*')")
    path=$(dirname "$cue")
    cp "${path}"/*jpg ~/.config/cmus/cmus-cover-art/.cover/cover.jpg
fi