conky-config/scripts/batmon

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#! /bin/bash
# small script to log battery usage in txt file for conky to parse
# lovingly stolen from battery-stats by petter reinholdtsen
DST_FILE="$XDG_CACHE_HOME/batmon.log"
SYS_BAT_PATH="/sys/class/power_supply/BAT0"
BAT_CAP_PATH="$SYS_BAT_PATH/charge_now"
BAT_CAP_FULL_PATH="$SYS_BAT_PATH/charge_full"
MAX_ENTRIES=1440 # number of minutes in day
read_bat_percent() {
timestamp=$(date +%s)
charge_now=$(cat "$BAT_CAP_PATH")
charge_full=$(cat "$BAT_CAP_FULL_PATH")
percent=$(echo "100 * $charge_now / $charge_full" | bc)
echo $timestamp $percent >> "$DST_FILE"
}
read_bat_percent
# truncate to most recent entries by max_entries
tail -n $MAX_ENTRIES "$DST_FILE" > /tmp/batmon.tmp.log && mv /tmp/batmon.tmp.log "$DST_FILE"