Improve battery indicator, add low level highlights

1 files changed, 25 insertions, 13 deletions

diff --git a/tmux/battery.sh b/tmux/battery.sh
index 26b3388..2cd1afb 100755
--- a/tmux/battery.sh
+++ b/tmux/battery.sh
@@ -1,17 +1,29 @@
 round() { awk -v n=$1 -v d=$2 'BEGIN{print int((n+d/2)/d) * d}'; }
 
 upower -i /org/freedesktop/UPower/devices/DisplayDevice | awk '/percentage:/ {print $2}' | {
-	read s;
-	lvl=$(round "${s%%%}" 10);
-	if [ $lvl -eq "10" ]; then printf "󰁺"; fi
-	if [ $lvl -eq "20" ]; then printf "󰁻"; fi
-	if [ $lvl -eq "30" ]; then printf "󰁼"; fi
-	if [ $lvl -eq "40" ]; then printf "󰁽"; fi
-	if [ $lvl -eq "50" ]; then printf "󰁾"; fi
-	if [ $lvl -eq "60" ]; then printf "󰁿"; fi
-	if [ $lvl -eq "70" ]; then printf "󰂀"; fi
-	if [ $lvl -eq "80" ]; then printf "󰂁"; fi
-	if [ $lvl -eq "90" ]; then printf "󰂂"; fi
-	if [ $lvl -eq "100" ]; then printf "󰁹"; fi
-	printf " %.0f%%" "${s%%%}";
+	read percentage_raw; # e.g. 69.420%
+	percentage_10s=$(round "${percentage_raw%%%}" 10); # rounded number: 70
+	# when battery is low, highlight it
+	if [ $percentage_10s -le "10" ]; then 
+		printf "#[bg=red,fg=brightwhite]";
+	elif [ $percentage_10s -le "20" ]; then
+		printf "#[bg=brightyellow]";
+	fi
+	printf " ";
+	# icon
+	if [ $percentage_10s -le "10" ]; then printf "󰁺"; fi
+	if [ $percentage_10s -eq "20" ]; then printf "󰁻"; fi
+	if [ $percentage_10s -eq "30" ]; then printf "󰁼"; fi
+	if [ $percentage_10s -eq "40" ]; then printf "󰁽"; fi
+	if [ $percentage_10s -eq "50" ]; then printf "󰁾"; fi
+	if [ $percentage_10s -eq "60" ]; then printf "󰁿"; fi
+	if [ $percentage_10s -eq "70" ]; then printf "󰂀"; fi
+	if [ $percentage_10s -eq "80" ]; then printf "󰂁"; fi
+	if [ $percentage_10s -eq "90" ]; then printf "󰂂"; fi
+	if [ $percentage_10s -eq "100" ]; then printf "󰁹"; fi
+	printf " ";
+	# percentage level rounded to a whole number (69%)
+	printf "%.0f%%" "${percentage_raw%%%}";
+	printf " ";
+	printf "#[default]"; # reset style
 }