dotfiles/bin/power-monitor.sh (view raw)
| 1 | #!/usr/bin/env bash |
| 2 | # ~~stolen~~ inspired by https://github.com/linuxmobile/kaku/blob/niri/home/services/system/power-monitor.nix |
| 3 | |
| 4 | set -euo pipefail |
| 5 | |
| 6 | STARTUP_WAIT=0 |
| 7 | |
| 8 | log() { |
| 9 | echo "[$(date '+%Y-%m-%d %H:%M:%S')] $*" >&2 |
| 10 | } |
| 11 | |
| 12 | get_battery_path() { |
| 13 | local bat_path |
| 14 | bat_path=$(echo /sys/class/power_supply/BAT*) |
| 15 | if [[ ! -d "$bat_path" ]]; then |
| 16 | log "No battery found" |
| 17 | exit 1 |
| 18 | fi |
| 19 | echo "$bat_path" |
| 20 | } |
| 21 | |
| 22 | readonly BAT |
| 23 | BAT="$(get_battery_path)" |
| 24 | |
| 25 | readonly BAT_STATUS="$BAT/status" |
| 26 | readonly BAT_CAP="$BAT/capacity" |
| 27 | readonly LOW_BAT_PERCENT=30 |
| 28 | |
| 29 | readonly AC_PROFILE="performance" |
| 30 | readonly BAT_PROFILE="balanced" |
| 31 | readonly LOW_BAT_PROFILE="power-saver" |
| 32 | |
| 33 | for file in "$BAT_STATUS" "$BAT_CAP"; do |
| 34 | if [[ ! -f "$file" ]]; then |
| 35 | log "Required file not found: $file" |
| 36 | exit 1 |
| 37 | fi |
| 38 | done |
| 39 | |
| 40 | if ! command -v powerprofilesctl >/dev/null 2>&1; then |
| 41 | log "powerprofilesctl not found" |
| 42 | exit 1 |
| 43 | fi |
| 44 | |
| 45 | if [[ -n "${STARTUP_WAIT:-}" ]]; then |
| 46 | sleep "$STARTUP_WAIT" |
| 47 | fi |
| 48 | |
| 49 | get_power_profile() { |
| 50 | local status capacity |
| 51 | status=$(cat "$BAT_STATUS") |
| 52 | capacity=$(cat "$BAT_CAP") |
| 53 | |
| 54 | if [[ "$status" == "Discharging" ]]; then |
| 55 | if [[ "$capacity" -gt $LOW_BAT_PERCENT ]]; then |
| 56 | echo "$BAT_PROFILE" |
| 57 | else |
| 58 | echo "$LOW_BAT_PROFILE" |
| 59 | fi |
| 60 | else |
| 61 | echo "$AC_PROFILE" |
| 62 | fi |
| 63 | } |
| 64 | |
| 65 | apply_profile() { |
| 66 | local profile=$1 |
| 67 | log "Setting power profile to $profile" |
| 68 | if ! powerprofilesctl set "$profile"; then |
| 69 | log "Failed to set power profile" |
| 70 | return 1 |
| 71 | fi |
| 72 | } |
| 73 | |
| 74 | log "Starting power monitor" |
| 75 | prev_profile="" |
| 76 | |
| 77 | while true; do |
| 78 | current_profile=$(get_power_profile) |
| 79 | |
| 80 | if [[ "$prev_profile" != "$current_profile" ]]; then |
| 81 | apply_profile "$current_profile" |
| 82 | prev_profile=$current_profile |
| 83 | fi |
| 84 | |
| 85 | if ! inotifywait -qq "$BAT_STATUS" "$BAT_CAP"; then |
| 86 | log "inotifywait failed, sleeping for 5 seconds before retry" |
| 87 | sleep 5 |
| 88 | fi |
| 89 | done |