postactiv configuration menu style

src/freedombone-app-postactiv

 }
 
 function configure_interactive_postactiv {
+    W=(1 $"Set a background image"
+       2 $"Set the title"
+       3 $"Set post expiry period (currently $POSTACTIV_EXPIRE_MONTHS months)"
+       4 $"Select Qvitter user interface"
+       5 $"Select Pleroma user interface"
+       6 $"Select Classic user interface")
+
     read_config_param "POSTACTIV_EXPIRE_MONTHS"
     while true
     do
-        data=$(mktemp 2>/dev/null)
-        dialog --backtitle $"Freedombone Control Panel" \
-               --title $"PostActiv" \
-               --radiolist $"Choose an operation:" 16 70 7 \
-               1 $"Set a background image" off \
-               2 $"Set the title" off \
-               3 $"Set post expiry period (currently $POSTACTIV_EXPIRE_MONTHS months)" off \
-               4 $"Select Qvitter user interface" off \
-               5 $"Select Pleroma user interface" off \
-               6 $"Select Classic user interface" off \
-               7 $"Exit" on 2> "$data"
-        sel=$?
-        case $sel in
-            1) rm -f "$data"
-               return;;
-            255) rm -f "$data"
-                 return;;
-        esac
-        case $(cat "$data") in
+        # shellcheck disable=SC2068
+        selection=$(dialog --backtitle $"Freedombone Administrator Control Panel" --title $"PostActiv" --menu $"Choose an operation, or ESC to exit:" 15 60 6 "${W[@]}" 3>&2 2>&1 1>&3)
+
+        if [ ! "$selection" ]; then
+            break
+        fi
+
+        case $selection in
             1) postactiv_set_background_image;;
             2) postactiv_set_title;;
             3) postactiv_set_expire_months;;
             4) gnusocial_use_qvitter postactiv;;
             5) gnusocial_use_pleroma postactiv;;
             6) gnusocial_use_classic postactiv;;
-            7) rm -f "$data"
-               break;;
         esac
-        rm -f "$data"
     done
 }