Give EWW scripts proper extensions

eww/scripts/get-battery.sh

@@ -0,0 +1,19 @@
+#!/bin/env sh
+
+BATTERY='/sys/class/power_supply/BAT1/'
+FULL="$(cat "${BATTERY}/charge_full")"
+NOW="$(cat "${BATTERY}/charge_now")"
+CHARGE=$((100*NOW/FULL))
+
+CHARGE_ICONS="󰂎󰁺󰁻󰁼󰁽󰁾󰁿󰂀󰂁󰂂󰁹"
+CHARGE_ICON_INDEX=$((CHARGE/10))
+CHARGE_ICON="${CHARGE_ICONS:CHARGE_ICON_INDEX:1}"
+
+charging() {
+  case "$(cat "${BATTERY}/status")" in
+    "Charging") echo "true";;
+	*) echo "false";;
+  esac
+}
+
+echo "{\"charge\":$CHARGE,\"icon\":\"$CHARGE_ICON\",\"charging\":$(charging)}"