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|
{ config, pkgs, ... }:
{
systemd.user.services.bt-notify = {
Unit = {
Description = "Bluetooth Connection & Battery Notifications";
After = [ "graphical-session.target" ];
ConditionPathExists = "${config.home.homeDirectory}/.local/bin/bt-notify.sh";
};
Install = {
WantedBy = [ "graphical-session.target" ];
};
Service = {
Type = "simple";
ExecStart = "${config.home.homeDirectory}/.local/bin/bt-notify.sh";
Restart = "always";
RestartSec = 5;
};
};
home.file."/.local/bin/bt-notify.sh" = {
source = pkgs.writeShellScript "bt-notify" ''
set -euo pipefail
# Temporary file to remember which devices were connected last loop
STATE_FILE="/tmp/bt-connected-state"
# Ensure the file exists
touch "$STATE_FILE"
# Listen to BlueZ D-Bus signals AND poll for battery (some devices only report on poll)
(
# D-Bus listener (connection events)
${pkgs.dbus}/bin/dbus-monitor "interface=org.bluez.Device1,member=PropertiesChanged" --system &
# Polling loop for battery (runs in background)
while true; do
${pkgs.bluez}/bin/bluetoothctl devices | cut -f2 -d' ' | while read -r mac; do
info=$(${pkgs.bluez}/bin/bluetoothctl info "$mac")
name=$(echo "$info" | grep -i "Alias" | cut -d' ' -f2-)
connected=$(echo "$info" | grep -i "Connected" | awk '{print $2}')
battery_line=$(echo "$info" | grep -i "Battery Percentage" || true)
battery=$(echo "$battery_line" | awk '{print $3}' | tr -d '()')
# --- Connection change detection ---
if [[ "$connected" == "yes" ]] && ! grep -q "^$mac$" "$STATE_FILE"; then
${pkgs.libnotify}/bin/notify-send -a "Bluetooth" "Connected" "$name"
echo "$mac" >> "$STATE_FILE"
elif [[ "$connected" == "no" ]] && grep -q "^$mac$" "$STATE_FILE"; then
${pkgs.libnotify}/bin/notify-send -a "Bluetooth" "Disconnected" "$name"
sed -i "/^$mac$/d" "$STATE_FILE"
fi
# --- Low battery warning ---
if [[ -n "$battery" && "$battery" -lt 20 ]]; then
${pkgs.libnotify}/bin/notify-send -u critical -a "Bluetooth" "Low Battery" "$name: ''${battery}%"
fi
done
sleep 10
done &
) | while read -r line; do
# Parse D-Bus PropertiesChanged for Connected
if echo "$line" | grep -q '"Connected"'; then
path=$(echo "$line" | grep -oP 'path="\K[^"]+')
mac=$(basename "$path")
info=$(${pkgs.bluez}/bin/bluetoothctl info "$mac")
name=$(echo "$info" | grep -i "Alias" | cut -d' ' -f2-)
connected=$(echo "$info" | grep -i "Connected" | awk '{print $2}')
if [[ "$connected" == "yes" ]] && ! grep -q "^$mac$" "$STATE_FILE"; then
${pkgs.libnotify}/bin/notify-send -a "Bluetooth" "Connected" "$name"
echo "$mac" >> "$STATE_FILE"
elif [[ "$connected" == "no" ]] && grep -q "^$mac$" "$STATE_FILE"; then
${pkgs.libnotify}/bin/notify-send -a "Bluetooth" "Disconnected" "$name"
sed -i "/^$mac$/d" "$STATE_FILE"
fi
fi
done
'';
};
}
|
