os/arch (panel): display notification on new email or updates

os/arch/.config/panel/lemons/mail

@@ -23,6 +23,9 @@ get_mail() {
     fi
 }
 
+mailtmp=/tmp/mail-count
+touch "$mailtmp"
+
 a=$(get_mail "${MAIL1_USER}" "${MAIL1_PASS}")
 b=$(get_mail "${MAIL2_USER}" "${MAIL2_PASS}")
 c=$(get_mail "${MAIL3_USER}" "${MAIL3_PASS}")
@@ -33,6 +36,13 @@ color="${COLOR_FG}"
 case $num in
     [1-9]*)
         icon="$icon$num"
+        lastnum=$(<$mailtmp)
+        if [[ $num != $lastnum ]]; then
+            echo "$num" > "$mailtmp"
+            if (( $num > $lastnum )); then
+                notify-send "New messages" "You have $(( $num - $mailtmp )) new messages"
+            fi
+        fi
         ;;
     0)  color="${COLOR_DIM}"
         ;;

os/arch/.config/panel/lemons/updates

@@ -2,9 +2,19 @@
 
 . $(dirname $0)/../panel-config
 
+updtmp=/tmp/update-count
+touch "$updtmp"
+
 num=$({ checkupdates; cower -u; } | wc -l)
 if [ "$num" -gt 0 ]
 then
+    lastnum=$(<$updtmp)
+    if [ "$num" -ne "${lastnum:-0}" ]; then
+        echo "$num" > "$updtmp"
+        if [ "$num" -gt "${lastnum:-0}" ]; then
+            notify-send "$num new updates available"
+        fi
+    fi
     echo "U%{F${COLOR_2}}$ICON_UPD$num%{F-}"
 else
     echo "U%{F${COLOR_DIM}}$ICON_UPD%{F-}"