dotfiles/battboy.sh at master · flores/dotfiles · GitHub

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#!/bin/bash

# for thinkpads with multiple batteries
# by default BAT0 completely discharges completely before engaging BAT1
# gtk/xfce/etc battery managers do not handle laptops with two batteries
# very well

# wip

path="/sys/devices/platform/smapi"
batts="BAT0 BAT1"
threshold="15" # when to flip it
ac=$(cat $path/ac_connected) # are we plugged in?

lockfile="/tmp/batboy" # make it cronable

if [ -e $lockfile ]; then
  echo -e "lockfile $lockfile exists: we're already acting on the battery"
  exit 0
fi

for batt in $batts; do

if [ -d $path/$batt ]; then
  energy_per=$(cat $path/$batt/remaining_percent)

  if [ $energy_per -lt $threshold ]; then
    if [ $ac -eq 0 ]; then
      echo "$batt less than $threshold percent!  flipping it off, sorry"
      echo "$batt " >> $lockfile
      echo 0 > $path/$batt/force_discharge
    else
      echo "we're still charging $batt."
    fi
  else
    if [ $ac -eq 0 ]; then
      echo cool $batt still at $energy_per percent
    else
      rm -f $lockfile
    fi
  fi

  else
    echo "no $batt found"
  fi

done