dotfiles @ 5f71cccef34230cd8e90d22f9a8015da7d55759d

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        +#!/usr/bin/env bash

      
        
        2
        +# ~~stolen~~ inspired by https://github.com/linuxmobile/kaku/blob/niri/home/services/system/power-monitor.nix

      
        
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        +

      
        
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        +set -euo pipefail

      
        
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        +

      
        
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        +STARTUP_WAIT=0

      
        
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        +

      
        
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        +log() {

      
        
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        +  echo "[$(date '+%Y-%m-%d %H:%M:%S')] $*" >&2

      
        
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        +}

      
        
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        +

      
        
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        +get_battery_path() {

      
        
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        +  local bat_path

      
        
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        +  bat_path=$(echo /sys/class/power_supply/BAT*)

      
        
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        +  if [[ ! -d "$bat_path" ]]; then

      
        
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        +    log "No battery found"

      
        
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        +    exit 1

      
        
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        +  fi

      
        
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        +  echo "$bat_path"

      
        
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        +}

      
        
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        +

      
        
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        +readonly BAT="$(get_battery_path)"

      
        
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        +readonly BAT_STATUS="$BAT/status"

      
        
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        +readonly BAT_CAP="$BAT/capacity"

      
        
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        +readonly LOW_BAT_PERCENT=30

      
        
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        +

      
        
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        +readonly AC_PROFILE="performance"

      
        
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        +readonly BAT_PROFILE="balanced"

      
        
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        +readonly LOW_BAT_PROFILE="power-saver"

      
        
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        +

      
        
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        +for file in "$BAT_STATUS" "$BAT_CAP"; do

      
        
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        +  if [[ ! -f "$file" ]]; then

      
        
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        +    log "Required file not found: $file"

      
        
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        +    exit 1

      
        
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        +  fi

      
        
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        +done

      
        
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        +

      
        
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        +if ! command -v powerprofilesctl >/dev/null 2>&1; then

      
        
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        +  log "powerprofilesctl not found"

      
        
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        +  exit 1

      
        
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        +fi

      
        
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        +

      
        
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        +if [[ -n "''${STARTUP_WAIT:-}" ]]; then

      
        
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        +  sleep "$STARTUP_WAIT"

      
        
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        +fi

      
        
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        +

      
        
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        +get_power_profile() {

      
        
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        +  local status capacity

      
        
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        +  status=$(cat "$BAT_STATUS")

      
        
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        +  capacity=$(cat "$BAT_CAP")

      
        
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        +

      
        
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        +  if [[ "$status" == "Discharging" ]]; then

      
        
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        +    if [[ "$capacity" -gt $LOW_BAT_PERCENT ]]; then

      
        
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        +      echo "$BAT_PROFILE"

      
        
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        +    else

      
        
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        +      echo "$LOW_BAT_PROFILE"

      
        
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        +    fi

      
        
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        +  else

      
        
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        +    echo "$AC_PROFILE"

      
        
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        +  fi

      
        
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        +}

      
        
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        +

      
        
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        +apply_profile() {

      
        
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        +  local profile=$1

      
        
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        +  log "Setting power profile to $profile"

      
        
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        +  if ! powerprofilesctl set "$profile"; then

      
        
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        +    log "Failed to set power profile"

      
        
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        +    return 1

      
        
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        +  fi

      
        
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        +}

      
        
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        +

      
        
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        +log "Starting power monitor"

      
        
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        +prev_profile=""

      
        
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        +

      
        
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        +while true; do

      
        
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        +  current_profile=$(get_power_profile)

      
        
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        +

      
        
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        +  if [[ "$prev_profile" != "$current_profile" ]]; then

      
        
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        +    apply_profile "$current_profile"

      
        
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        +    prev_profile=$current_profile

      
        
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        +  fi

      
        
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        +

      
        
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        +  if ! inotifywait -qq "$BAT_STATUS" "$BAT_CAP"; then

      
        
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        +    log "inotifywait failed, sleeping for 5 seconds before retry"

      
        
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        +    sleep 5

      
        
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        +  fi

      
        
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        +done

      

···
        
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        +[Unit]

      
        
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        +Description = Power Monitor

      
        
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        +After = power-profiles-daemon.service

      
        
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        +Wants = power-profiles-daemon.service

      
        
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        +

      
        
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        +[Service]

      
        
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        +Type = simple

      
        
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        +ExecStart = /home/olex/bin/power-monitor.sh

      
        
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        +Restart = on-failure

      
        
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        +RestartSec = 5s

      
        
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        +

      
        
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        +[Install]

      
        
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        +WantedBy=default.target