bin/power-monitor.sh (view raw)
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#!/usr/bin/env bash
# ~~stolen~~ inspired by https://github.com/linuxmobile/kaku/blob/niri/home/services/system/power-monitor.nix
set -euo pipefail
STARTUP_WAIT=0
log() {
echo "[$(date '+%Y-%m-%d %H:%M:%S')] $*" >&2
}
get_battery_path() {
local bat_path
bat_path=$(echo /sys/class/power_supply/BAT*)
if [[ ! -d "$bat_path" ]]; then
log "No battery found"
exit 1
fi
echo "$bat_path"
}
readonly BAT
BAT="$(get_battery_path)"
readonly BAT_STATUS="$BAT/status"
readonly BAT_CAP="$BAT/capacity"
readonly LOW_BAT_PERCENT=30
readonly AC_PROFILE="performance"
readonly BAT_PROFILE="balanced"
readonly LOW_BAT_PROFILE="power-saver"
for file in "$BAT_STATUS" "$BAT_CAP"; do
if [[ ! -f "$file" ]]; then
log "Required file not found: $file"
exit 1
fi
done
if ! command -v powerprofilesctl >/dev/null 2>&1; then
log "powerprofilesctl not found"
exit 1
fi
if [[ -n "${STARTUP_WAIT:-}" ]]; then
sleep "$STARTUP_WAIT"
fi
get_power_profile() {
local status capacity
status=$(cat "$BAT_STATUS")
capacity=$(cat "$BAT_CAP")
if [[ "$status" == "Discharging" ]]; then
if [[ "$capacity" -gt $LOW_BAT_PERCENT ]]; then
echo "$BAT_PROFILE"
else
echo "$LOW_BAT_PROFILE"
fi
else
echo "$AC_PROFILE"
fi
}
apply_profile() {
local profile=$1
log "Setting power profile to $profile"
if ! powerprofilesctl set "$profile"; then
log "Failed to set power profile"
return 1
fi
}
log "Starting power monitor"
prev_profile=""
while true; do
current_profile=$(get_power_profile)
if [[ "$prev_profile" != "$current_profile" ]]; then
apply_profile "$current_profile"
prev_profile=$current_profile
fi
if ! inotifywait -qq "$BAT_STATUS" "$BAT_CAP"; then
log "inotifywait failed, sleeping for 5 seconds before retry"
sleep 5
fi
done
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