93 lines
2.1 KiB
Bash
Executable File
93 lines
2.1 KiB
Bash
Executable File
#!/usr/bin/env bash
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set -euo pipefail
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CONFIG="${BRIGHTNESS_AUTOMATION_CONFIG:-$HOME/.config/brightness-automation/env}"
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if [[ -f "$CONFIG" ]]; then
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# shellcheck disable=SC1090
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source "$CONFIG"
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fi
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BACKLIGHT_DEVICE="${BRIGHTNESS_BACKLIGHT_DEVICE:-intel_backlight}"
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BACKLIGHT_PATH="${BRIGHTNESS_SYNC_BACKLIGHT:-/sys/class/backlight/${BACKLIGHT_DEVICE}}"
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STEP="${BRIGHTNESS_STEP:-10}"
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DEBOUNCE_MS="${BRIGHTNESS_APPLY_DEBOUNCE_MS:-180}"
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STATE_DIR="${XDG_RUNTIME_DIR:-/tmp}/brightness-automation"
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STATE_FILE="$STATE_DIR/target-percent"
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STAMP_FILE="$STATE_DIR/target-stamp"
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LOCK_FILE="$STATE_DIR/lock"
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mkdir -p "$STATE_DIR"
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read_current_percent() {
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local current max
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current="$(<"${BACKLIGHT_PATH}/brightness")"
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max="$(<"${BACKLIGHT_PATH}/max_brightness")"
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printf '%s\n' "$(( (current * 100 + max / 2) / max ))"
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}
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clamp_percent() {
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local value="$1"
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if (( value < 1 )); then
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value=1
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elif (( value > 100 )); then
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value=100
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fi
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printf '%s\n' "$value"
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}
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now_ms() {
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date +%s%3N
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}
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apply_after_quiet_period() {
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while true; do
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sleep "$(awk "BEGIN { printf \"%.3f\", ${DEBOUNCE_MS} / 1000 }")"
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local now stamp age target
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now="$(now_ms)"
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stamp="$(<"$STAMP_FILE")"
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age="$(( now - stamp ))"
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if (( age >= DEBOUNCE_MS )); then
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target="$(<"$STATE_FILE")"
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brightnessctl -q -d "$BACKLIGHT_DEVICE" set "${target}%"
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exit 0
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fi
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done
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}
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if [[ "${1:-}" == "--apply-worker" ]]; then
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apply_after_quiet_period
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fi
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if [[ "$#" -ne 1 || ! "$1" =~ ^(up|down)$ ]]; then
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echo "Usage: $(basename "$0") up|down" >&2
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exit 2
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fi
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(
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flock 9
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current="$(read_current_percent)"
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if [[ -f "$STATE_FILE" ]]; then
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base="$(<"$STATE_FILE")"
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else
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base="$current"
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fi
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case "$1" in
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up) target="$(( base + STEP ))" ;;
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down) target="$(( base - STEP ))" ;;
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esac
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target="$(clamp_percent "$target")"
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printf '%s\n' "$target" >"$STATE_FILE"
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now_ms >"$STAMP_FILE"
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"$HOME/.local/bin/brightness-osd" "$target" || true
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) 9>"$LOCK_FILE"
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if ! pgrep -f "$HOME/.local/bin/brightness-step --apply-worker" >/dev/null 2>&1; then
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nohup "$HOME/.local/bin/brightness-step" --apply-worker >/dev/null 2>&1 &
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fi
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