Add battery warning

dotfiles/.config/sway/bin/battery.sh

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+# I run this in crontab every five minutes
+
+warning=10
+error=5
+
+battery_percent="$(cat /sys/class/power_supply/BAT0/capacity)"
+
+if [[ ${battery_percent} -gt ${warning} ]]; then
+    exit 0
+fi
+if [[ ${battery_percent} -lt ${warning} ]]; then
+    mtype="warning"
+fi
+if [[ ${battery_percent} -lt ${error} ]]; then
+    mtype="error"
+fi
+swaynag -s "Dismiss" -e bottom -t ${mtype} -m "WARNING: Battery at ${battery_percent}%"
+exit 0