add charge status indication

bin/st-power

@@ -38,7 +38,17 @@ else
   POWER="$(echo "scale=2; $VOLTAGE*$CURRENT/1000000000000" | bc)W"
 fi
 
+STATUS=$(cat /sys/class/power_supply/BAT*/status)
+
+case "$STATUS" in
+  "Charging")
+    STATUS="+";;
+  "Discharging")
+    STATUS="-";;
+  "Not Charging")
+    STATUS="...";;
+esac
 
 CHARGE="$(cat /sys/class/power_supply/BAT*/capacity)%"
 
-echo "$CHARGE $POWER"
+echo "$CHARGE $STATUS$POWER"