dotfiles/bin/batterytrack

#!/usr/bin/env bash

# ------------------------------------------
# Track battery over time (every 30 mins)
# Run: nohup batterytrack &> /dev/null &
# ------------------------------------------

logfile="$HOME/.batterytrack.log"
pidfile="/tmp/batterytrack.pid"
batterydir="/sys/class/power_supply/BAT0"

# not a laptop
[[ ! -d "$batterydir" ]] && exit

echo $$ > "$pidfile"
trap "rm '$pidfile'" EXIT SIGTERM
while true; do
  cat "${batterydir}/uevent" | tr '\n' ',' >> "$logfile"
  printf "$(date +'%m-%d-%Y %H:%M:%S')" >> "$logfile"
  printf "\n" >> "$logfile"
  sleep 1800
done
exit 0