perf(waybar): only send media updates when necessary

users/price/dots/.config/waybar/scripts/get-media.bash

@@ -3,8 +3,6 @@
 get-album-info() {
 	local class
 	local text=""
-
-	while :; do
 	if class="$(playerctl metadata --format '{{lc(status)}}')"; then
 		local player_ctl_info
 		player_ctl_info="$(playerctl metadata --format '{{ artist }} | {{ title }} | {{ album }}')"
@@ -21,12 +19,13 @@ get-album-info() {
 	fi
 
 	printf '{"class": "%s", "text": "%s"}\n' "${class}" "${text}"
-		sleep .5
-	done
 }
 
 main() {
 	get-album-info
+	while IFS= read -r _; do
+		get-album-info
+	done < <(busctl --user monitor --json=short --match 'interface=org.mpris.MediaPlayer2.Player,type=signal')
 }
 
 main