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round() { awk -v n=$1 -v d=$2 'BEGIN{print int((n+d/2)/d) * d}'; }
# e.g. 7h
est_time=$(upower -i /org/freedesktop/UPower/devices/DisplayDevice | awk '/time to empty:/ {print $4substr($5, 1, 1)}')
# charging / discharging / pending-charge / ???
chg_state=$(upower -i /org/freedesktop/UPower/devices/DisplayDevice | awk '/state:/ {print $2}')
# e.g. 69.420%
percentage_raw=$(upower -i /org/freedesktop/UPower/devices/DisplayDevice | awk '/percentage:/ {print $2}')
# rounded to integer
percentage_int=$(printf "%.0f%" "${percentage_raw%%%}")
# when battery is low, highlight the widget
if [[ $percentage_int -le "10" ]]; then
printf "#[[bg=red,fg=brightwhite]]";
elif [[ $percentage_int -le "15" ]]; then
printf "#[[bg=brightyellow]]";
fi
printf " "; # left padding
# battery icon
if [[ $chg_state == "charging" ]]; then
printf ""
else
case "$(round "$percentage_int" 10)" in
"10") printf "";;
"20") printf "";;
"30") printf "";;
"40") printf "";;
"50") printf "";;
"60") printf "";;
"70") printf "";;
"80") printf "";;
"90") printf "";;
"100") printf "";;
esac
fi
printf " "; #bat-percent gap
printf "%s%%" "$percentage_int";
# this is only shown when on battery
if [[ $est_time ]]; then
printf " "; #percent-estimage gap
printf " $est_time"
fi
printf " "; # right padding
printf "#[default]"; # reset style
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