Added battery-notify.sh

battery-notify.sh

@@ -0,0 +1,39 @@
+#!/usr/bin/env zsh
+
+if [[ "$(uname)" = 'Linux' ]]; then
+    let charge_full="$(cat '/sys/class/power_supply/BAT0/charge_full')."
+    function get_battery_percent {
+        let charge_now="$(cat '/sys/class/power_supply/BAT0/charge_now')."
+        printf '%.0f' "$((charge_now / charge_full * 100))"
+    }
+
+    function is_adapted_connected {
+        let connected="$(cat /sys/class/power_supply/ADP1/online)"
+        if ((${connected} == 1)); then
+            echo true
+        else
+            echo false
+        fi
+    }
+# Linux ends here
+else
+    echo "${0}: error: unknown os: \"$(uname)\"" >&2
+    exit 1
+fi
+
+function send_battery_warning {
+    notify-send -t 0 "Low Battery" "Battery is at ${1}%!"
+}
+
+local did_notify=false
+
+while true; do
+    let battery_percent="$(get_battery_percent)"
+    if ((${battery_percent} > 10)) || "$(is_adapted_connected)"; then
+        did_notify=false
+    elif ! ${did_notify}; then
+        did_notify=true
+        send_battery_warning ${battery_percent}
+    fi
+    sleep 10
+done