perf(waybar): only send media updates when necessary

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

@@ -3,30 +3,29 @@
 get-album-info() {
 	local class
 	local text=""
+	if class="$(playerctl metadata --format '{{lc(status)}}')"; then
+		local player_ctl_info
+		player_ctl_info="$(playerctl metadata --format '{{ artist }} | {{ title }} | {{ album }}')"
 
-	while :; do
+		if [[ "${class}" == "playing" ]]; then
-		if class="$(playerctl metadata --format '{{lc(status)}}')"; then
+			text="󰎆 ${player_ctl_info}"
-			local player_ctl_info
-			player_ctl_info="$(playerctl metadata --format '{{ artist }} | {{ title }} | {{ album }}')"
 
-			if [[ "${class}" == "playing" ]]; then
+		elif [[ "${class}" == "paused" ]]; then
-				text="󰎆 ${player_ctl_info}"
+			text="󰏦 ${player_ctl_info}"
-
-			elif [[ "${class}" == "paused" ]]; then
-				text="󰏦 ${player_ctl_info}"
-			fi
-		else
-			class="paused"
-			text="󰓄 No Media"
 		fi
+	else
+		class="paused"
+		text="󰓄 No Media"
+	fi
 
-		printf '{"class": "%s", "text": "%s"}\n' "${class}" "${text}"
+	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