Refactor install_script menu and preset handling

Simplifies the install_script function by replacing the PRESET environment variable logic with direct CLI argument support for preset selection. Updates the whiptail menu options, streamlines case handling, and improves error handling for invalid options. This refactor makes the script interface more intuitive and reduces code complexity.

misc/build.func

@@ -1519,97 +1519,62 @@ install_script() {
   timezone=$(cat /etc/timezone)
   header_info
 
-  # --- PRESET support ---
-  if [ -n "${PRESET:-}" ]; then
-    case "$PRESET" in
-    DEFAULT | default | 1)
-      CHOICE="1"
-      ;;
-    VERBOSE | verbose | 2)
-      CHOICE="2"
-      ;;
-    ADVANCED | advanced | 3)
-      CHOICE="3"
-      ;;
-    MYDEFAULTS | mydefaults | 4)
-      CHOICE="4"
-      ;;
-    APPDEFAULTS | appdefaults | 5)
-      CHOICE="5"
-      ;;
-    *)
-      echo -e "\n${CROSS}${RD}Invalid PRESET value: ${PRESET}${CL}\n"
-      exit 1
-      ;;
-    esac
-  else
-    # Build dynamic menu
+  # --- Support CLI argument as direct preset (default, advanced, …) ---
+  CHOICE="${1:-}"
+
+  # If no CLI argument → show whiptail menu
+  if [ -z "$CHOICE" ]; then
     local menu_items=(
       "1" "Default Install"
-      "2" "Default Install (Verbose)"
-      "3" "Advanced Settings"
-      "4" "My Defaults"
+      "2" "Advanced Install"
+      "3" "My Defaults"
     )
 
     if [ -f "$(get_app_defaults_path)" ]; then
-      menu_items+=("5" "App Defaults for ${APP}")
-      menu_items+=("6" "Settings")
-    else
+      menu_items+=("4" "App Defaults for ${APP}")
       menu_items+=("5" "Settings")
+    else
+      menu_items+=("4" "Settings")
     fi
 
     TMP_CHOICE=$(whiptail --backtitle "[dev] Proxmox VE Helper Scripts" \
       --title "SETTINGS" \
-      --ok-button "OK" --cancel-button "Exit Script" \
+      --ok-button "Select" --cancel-button "Exit Script" \
       --menu "Choose an option:" 20 60 9 \
       "${menu_items[@]}" \
-      --default-item "1" 3>&1 1>&2 2>&3) || true
+      --default-item "1" 3>&1 1>&2 2>&3) || exit_script
 
-    if [ -z "$TMP_CHOICE" ]; then
-      exit_script
-    fi
     CHOICE="$TMP_CHOICE"
   fi
 
-  case $CHOICE in
-  1)
+  # --- Main case ---
+  case "$CHOICE" in
+  1 | default | DEFAULT)
     header_info
     echo -e "${DEFAULT}${BOLD}${BL}Using Default Settings on node $PVEHOST_NAME${CL}"
     VERBOSE="no"
     METHOD="default"
     base_settings "$VERBOSE"
     echo_default
-    # Always ask storages for MyDefaults file (create if missing)
     ensure_storage_selection_for_vars_file "/usr/local/community-scripts/default.vars"
     ;;
-  2)
-    header_info
-    echo -e "${DEFAULT}${BOLD}${BL}Using Default Settings on node $PVEHOST_NAME (Verbose)${CL}"
-    VERBOSE="yes"
-    METHOD="default"
-    base_settings "$VERBOSE"
-    echo_default
-    ensure_storage_selection_for_vars_file "/usr/local/community-scripts/default.vars"
-    ;;
-  3)
+  2 | advanced | ADVANCED)
     header_info
     echo -e "${ADVANCED}${BOLD}${RD}Using Advanced Install on node $PVEHOST_NAME${CL}"
     METHOD="advanced"
     base_settings
     advanced_settings
-    # Always ask storages (stored to env var_* so app-defaults will include them)
     ensure_storage_selection_for_vars_file "/usr/local/community-scripts/default.vars"
     maybe_offer_save_app_defaults
     ;;
-  4)
+  3 | mydefaults | MYDEFAULTS)
     default_var_settings || {
       msg_error "Failed to apply default.vars"
       exit 1
     }
-    # Always let user pick storages again (unless only one exists)
     ensure_storage_selection_for_vars_file "/usr/local/community-scripts/default.vars"
     ;;
-  5)
+  4 | appdefaults | APPDEFAULTS)
     if [ -f "$(get_app_defaults_path)" ]; then
       header_info
       echo -e "${DEFAULT}${BOLD}${BL}Using App Defaults for ${APP} on node $PVEHOST_NAME${CL}"
@@ -1617,16 +1582,18 @@ install_script() {
       base_settings
       _load_vars_file "$(get_app_defaults_path)"
       echo_default
-      # Always let user confirm/change storages for the app defaults
       ensure_storage_selection_for_vars_file "$(get_app_defaults_path)"
+    else
+      msg_error "No App Defaults available for ${APP}"
+      exit 1
     fi
     ;;
-  6)
+  5 | settings | SETTINGS)
     settings_menu
-    exit 0
     ;;
   *)
-    echo -e "${CROSS}${RD}Invalid option, please try again.${CL}"
+    echo -e "${CROSS}${RD}Invalid option: $CHOICE${CL}"
+    exit 1
     ;;
   esac
 }