#!/bin/bash

# mark this file as executable,
# then change your sway config (.config/sway/):
#
# [...]
# bar {
#     [...]
# 
#     # When the status_command prints a new line to stdout, swaybar updates.
#     status_command ~/.config/sway/swaystatus_mark
# 
#     [...]
# }
# [...]


while true; do
  BatteryStatus="$(upower -i /org/freedesktop/UPower/devices/battery_BAT0)"
  echo "$BatteryStatus" >&2
  Perc="$(echo "$BatteryStatus" | grep -i 'percentage' | grep -ioE '\-?[01-9,.]+%')"
  Watt="$(echo "$BatteryStatus" | grep -i 'energy-rate' | grep -ioE '\-?[01-9,.]+ ?W' | grep -ioE '\-?[01-9]+' | head -n 1)"
  Remaining="$(echo "$BatteryStatus" | grep -i 'time to empty' | grep -ioE '\-?[01-9,.]+.*')"
  Time="$(date +'%H:%M:%S   | %F')"
  printf '%s, %sW → %s |   %s \n' "$Perc" "$Watt" "$Remaining" "$Time"
  snooze -H '*' -M '*' -S '/5' || sleep 5
done