nixdots/system/roles/laptop/power/power-profiles-daemon/scripts/power_monitor.sh

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#!/usr/bin/env bash
BAT=$(echo /sys/class/power_supply/BAT*) # only supports single-battery systems
BAT_STATUS="$BAT/status"
BAT_CAP="$BAT/capacity"
POWER_SAVE_PERCENT=50 # Enter power-save mode if on bat and below this capacity
HAS_PERFORMANCE="$(powerprofilesctl list | grep "performance" || true)" # the || true ignores grep failing with non-zero code
# monitor loop
prev=0
while true; do
# read the current state
status="$(cat "$BAT_STATUS")"
capacity="$(cat "$BAT_CAP")"
if [[ $status == "Discharging" ]]; then
if [[ $capacity -le $POWER_SAVE_PERCENT ]]; then
profile="power-saver"
else
profile="balanced"
fi
else
if [[ -n $HAS_PERFORMANCE ]]; then
profile="performance"
else
profile="balanced"
fi
fi
# Set the new profile
if [[ $profile != $prev ]]; then
echo -en "Setting power profile to ${profile}\n"
powerprofilesctl set $profile
prev=$profile
fi
# wait for changes in status or capacity files
# i.e. for the next power change event
inotifywait -qq "$BAT_STATUS" "$BAT_CAP"
done