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{ config, lib, pkgs, ...}: | |
with lib; | |
let | |
cfg = config.services.batteryNotifier; | |
in { | |
options = { | |
services.batteryNotifier = { | |
enable = mkOption { | |
default = false; | |
description = '' | |
Whether to enable battery notifier. | |
''; | |
}; | |
device = mkOption { | |
default = "BAT0"; | |
description = '' | |
Device to monitor. | |
''; | |
}; | |
notifyCapacity = mkOption { | |
default = 10; | |
description = '' | |
Battery level at which a notification shall be sent. | |
''; | |
}; | |
suspendCapacity = mkOption { | |
default = 5; | |
description = '' | |
Battery level at which a suspend unless connected shall be sent. | |
''; | |
}; | |
}; | |
}; | |
config = mkIf cfg.enable { | |
systemd.user.timers."lowbatt" = { | |
description = "check battery level"; | |
timerConfig.OnBootSec = "1m"; | |
timerConfig.OnUnitInactiveSec = "1m"; | |
timerConfig.Unit = "lowbatt.service"; | |
wantedBy = ["timers.target"]; | |
}; | |
systemd.user.services."lowbatt" = { | |
description = "battery level notifier"; | |
serviceConfig.PassEnvironment = "DISPLAY"; | |
script = '' | |
export battery_capacity=$(${pkgs.coreutils}/bin/cat /sys/class/power_supply/${cfg.device}/capacity) | |
export battery_status=$(${pkgs.coreutils}/bin/cat /sys/class/power_supply/${cfg.device}/status) | |
if [[ $battery_capacity -le ${builtins.toString cfg.notifyCapacity} && $battery_status = "Discharging" ]]; then | |
${pkgs.libnotify}/bin/notify-send --urgency=critical --hint=int:transient:1 --icon=battery_empty "Battery Low" "You should probably plug-in." | |
fi | |
if [[ $battery_capacity -le ${builtins.toString cfg.suspendCapacity} && $battery_status = "Discharging" ]]; then | |
${pkgs.libnotify}/bin/notify-send --urgency=critical --hint=int:transient:1 --icon=battery_empty "Battery Critically Low" "Computer will suspend in 60 seconds." | |
sleep 60s | |
battery_status=$(${pkgs.coreutils}/bin/cat /sys/class/power_supply/${cfg.device}/status) | |
if [[ $battery_status = "Discharging" ]]; then | |
systemctl suspend | |
fi | |
fi | |
''; | |
}; | |
}; | |
} |
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