herbstluftwm: panel: add volume bar

config/herbstluftwm/panel.sh

@@ -107,6 +107,16 @@ function battery() {
 	fi
 }
 
+# VOLUME
+function volume() {
+	vol=$(amixer get Master | awk -F"[][]" '/dB/ {if($6~"off"){print "0%";} else {print $2;}}' | tr -d '%')
+	if [[ $vol -le 0 ]]; then
+		echo -n $(icon volume_off grey) $(echo $vol | dzen2-gdbar -nonl)
+	else
+		echo -n $(icon volume_on white) $(echo $vol | dzen2-gdbar -nonl)
+	fi
+}
+
 hc pad $monitor $panel_height
 
 {
@@ -175,7 +185,7 @@ hc pad $monitor $panel_height
 		right=""
 
 		# custom functions
-		for func in cpu battery; do
+		for func in cpu volume battery; do
 			right="${right} $(${func})"
 		done