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Hadi
104 lines
2.6 KiB
Bash
104 lines
2.6 KiB
Bash
# battery-monitor: low-battery alerts for waybar/swaync.
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# Runs main once (triggered by the battery-monitor systemd timer).
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POWER_SUPPLY_DIR="${POWER_SUPPLY_DIR:-/sys/class/power_supply}"
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STATE_FILE="${BATTERY_STATE_FILE:-/tmp/battery-alert-state}"
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CRIT_ID_FILE="${BATTERY_CRIT_ID_FILE:-/tmp/battery-crit-id}"
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WARN_THRESHOLD=10
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CRIT_THRESHOLD=5
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# Pure decision. Prints "<action>:<newstate>".
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# action ∈ noop | osd_warn | crit_show | crit_clear ; state ∈ none | warn10 | crit5
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battery_decide() {
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status=$1
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cap=$2
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prev=$3
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if [ "$status" = "Discharging" ]; then
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if [ "$cap" -le "$CRIT_THRESHOLD" ]; then
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echo "crit_show:crit5"
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elif [ "$cap" -le "$WARN_THRESHOLD" ]; then
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if [ "$prev" = "crit5" ]; then
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echo "crit_clear:warn10"
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elif [ "$prev" = "warn10" ]; then
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echo "noop:warn10"
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else
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echo "osd_warn:warn10"
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fi
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else
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if [ "$prev" = "crit5" ]; then
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echo "crit_clear:none"
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else
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echo "noop:none"
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fi
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fi
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else
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if [ "$prev" = "crit5" ]; then
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echo "crit_clear:none"
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else
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echo "noop:none"
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fi
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fi
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}
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# First real battery (type == Battery, with status + capacity).
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resolve_battery() {
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for d in "$POWER_SUPPLY_DIR"/*; do
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[ -r "$d/type" ] || continue
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[ "$(cat "$d/type")" = "Battery" ] || continue
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[ -r "$d/status" ] && [ -r "$d/capacity" ] || continue
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printf '%s' "$d"
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return 0
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done
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return 1
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}
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show_warn_osd() {
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waybar-osd " Low battery · $1%"
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}
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show_crit_notification() {
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cap=$1
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id=$(cat "$CRIT_ID_FILE" 2>/dev/null || echo 0)
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newid=$(notify-send --print-id --replace-id="$id" \
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--urgency=critical --expire-time=0 \
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" Critical battery" "Battery at $cap%: plug in the charger")
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printf '%s' "$newid" >"$CRIT_ID_FILE"
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}
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clear_crit_notification() {
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id=$(cat "$CRIT_ID_FILE" 2>/dev/null || echo 0)
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if [ "$id" != "0" ]; then
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gdbus call --session \
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--dest org.freedesktop.Notifications \
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--object-path /org/freedesktop/Notifications \
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--method org.freedesktop.Notifications.CloseNotification "$id" \
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>/dev/null 2>&1 || true
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fi
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rm -f "$CRIT_ID_FILE"
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}
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main() {
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dir=$(resolve_battery) || exit 0
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status=$(cat "$dir/status")
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cap=$(cat "$dir/capacity")
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prev=$(cat "$STATE_FILE" 2>/dev/null || echo none)
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result=$(battery_decide "$status" "$cap" "$prev")
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action=${result%%:*}
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newstate=${result##*:}
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case "$action" in
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osd_warn) show_warn_osd "$cap" ;;
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crit_show) show_crit_notification "$cap" ;;
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crit_clear) clear_crit_notification ;;
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noop) : ;;
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esac
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printf '%s' "$newstate" >"$STATE_FILE"
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}
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main "$@"
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