Dealing with titles or other strings containing special characters (" or ')

[k0ruy]

With the original code, inside spotify-panel.sh, when sp.sh eval is called with the eval bash function, the title or album may not be displayed because of quotes that end the string unexpectedly. For this, I changed how the metadata is parsed inside spotify-panel.sh, adding a function and changing how the title is trimmed.

#!/usr/bin/env bash

readonly DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
declare -A SPOTIFY_METADATA

# ... existing code (encode function)

function fetch_spotify_metadata {
	while read -r line; do
		key="${line%%=*}"
		value="${line#*=}"
		value="${value%\"}"
		value="${value#\"}"
		SPOTIFY_METADATA["$key"]="$value"
	done < <( ${DIR}/sp.sh eval )
}

if pidof spotify &> /dev/null; then
	# call this function to populate SPOTIFY_METADATA
	fetch_spotify_metadata

	SPOTIFY_TITLE=${SPOTIFY_METADATA["SPOTIFY_TITLE"]}
	SPOTIFY_ARTIST=${SPOTIFY_METADATA["SPOTIFY_ARTIST"]}
	SPOTIFY_ALBUM=${SPOTIFY_METADATA["SPOTIFY_ALBUM"]}

    	# grab window id 
	WINDOW_ID=$(wmctrl -l | grep "${SPOTIFY_ARTIST} - ${SPOTIFY_TITLE}\|Spotify" | awk '{print $1}')
    
	# trim the title
	MAX_LENGTH=20
	DISPLAY_TITLE=$(python3 -c "import sys; title=sys.argv[1]; print(title[:$MAX_LENGTH] + '...' if len(title) > $MAX_LENGTH else title)" "$SPOTIFY_TITLE")

    echo "<img>${ICON}</img>"
    # ...rest of code