Shell script that generates a string describing power supply status, to use with dwmblocks and Font Awesome

power.sh

#!/bin/sh

is_ac_powered=$(cat /sys/class/power_supply/AC0/online)
batt_capacity=$(cat /sys/class/power_supply/BAT0/capacity)

if [ "$is_ac_powered" -eq 1 ]; then
  icon="" #uF1E6
else
  if [ "$batt_capacity" -gt 80 ]; then
    icon="" #uF240 
  elif [ "$batt_capacity" -le 80 -a "$batt_capacity" -gt 60 ]; then
    icon="" #uF241
  elif [ "$batt_capacity" -le 60 -a "$batt_capacity" -gt 40 ]; then
    icon="" #uF242
  elif [ "$batt_capacity" -le 40 -a "$batt_capacity" -gt 20 ]; then
    icon="" #uF243
  else
    icon="" #uF244
  fi
fi

echo $icon