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83 lines
2.1 KiB
Bash
Executable file
83 lines
2.1 KiB
Bash
Executable file
#!/usr/bin/env bash
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set -euo pipefail
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# This is a script which can be kept running as a cronjob or systemd timer to
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# notify the user when the battery is low.
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# $BATTERY env var can be set manually, being the path of the device
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# (in /sys/class/power_supply/) i.e. BATTERY=/sys/class/power_supply/BAT0.
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#
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# If left unset, the script will automatically pick the battery device
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# with the most recent change time. (This provides some limited support
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# for systems with multiple batteries.)
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#
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# If the battery reaches below $NOTIFY_THRESHOLD (defaults to 5%),
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# a notification will be shown. Note that only a single notification
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# will be shown per charge cycle.
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NOTIFY_THRESHOLD="${NOTIFY_THRESHOLD:-5}"
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if [ -z "${BATTERY:-}" ]; then
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BATTERY="$(find /sys/class/power_supply -maxdepth 1 -name 'BAT*' -exec stat -c '%Y %n' {} + | sort -k1,1nr | head -n 1 | cut -d' ' -f2-)"
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fi
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NOTIFY_LOCK_FILE=/tmp/battery-notif
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get_bat_info() {
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cat "$BATTERY"/"$1"
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}
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capacity="$(get_bat_info capacity)"
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status="$(get_bat_info status)"
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reset_notify() {
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if [ -f "$NOTIFY_LOCK_FILE" ]; then
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echo "Resetting notification flag"
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rm -f "$NOTIFY_LOCK_FILE"
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fi
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}
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maybe_notify() {
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if [ -f "$NOTIFY_LOCK_FILE" ]; then
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exit 0
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fi
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echo "Sending notification"
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notify-send \
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-a battery-notification \
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-u critical \
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-i "$(pick_battery_icon)" \
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"Battery low" "Battery is below $NOTIFY_THRESHOLD%"
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touch "$NOTIFY_LOCK_FILE"
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}
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pick_battery_icon() {
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local icon_candidate
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local data_dirs="${XDG_DATA_DIRS:-/usr/local/share:/usr/share}" # fallback
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local IFS=':'
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for icon_candidate in battery-caution battery-low battery; do
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for dir in $data_dirs; do
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if find "$dir/icons" -type f -iname "${icon_candidate}.*" 2>/dev/null | grep -q .; then
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echo "$icon_candidate"
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return 0
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fi
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done
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done
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echo ""
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}
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# The battery is not discharging (i.e. charging or full),
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# we don't need to notify the user.
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if [ "$status" != "Discharging" ]; then
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reset_notify
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exit 0
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fi
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if [ "$capacity" -gt "$NOTIFY_THRESHOLD" ]; then
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reset_notify
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exit 0
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fi
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maybe_notify
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