refactor: conditional to use WithHideFunc groups

this allows the form to be navigated and the user to choose another
option by going back.

examples/conditional/main.go

@@ -22,62 +22,61 @@ func (c consumable) String() string {
 func main() {
 
 	var category consumable
-
-	// First, ask for a broad food category.
-	err := huh.NewSelect[consumable]().
-		Title("What are you in the mood for?").
-		Value(&category).
-		Options(
-			huh.NewOption("Some fruit", fruits),
-			huh.NewOption("A vegetable", vegetables),
-			huh.NewOption("A drink", drinks),
-		).
-		Run()
-
-	if err != nil {
-		fmt.Println("Decision trouble:", err)
-		os.Exit(1)
-	}
-
 	type opts []huh.Option[string]
 
 	var choice string
 
 	// Then ask for a specific food item based on the previous answer.
-	err = huh.NewSelect[string]().
-		Title(fmt.Sprintf("Okay, what kind of %s are you in the mood for?", category)).
-		Value(&choice).
-		Options(
-			func(c consumable) opts {
-				switch c {
-				case fruits:
-					return opts{
+	err :=
+		huh.NewForm(
+			huh.NewGroup(
+				huh.NewSelect[consumable]().
+					Title("What are you in the mood for?").
+					Value(&category).
+					Options(
+						huh.NewOption("Some fruit", fruits),
+						huh.NewOption("A vegetable", vegetables),
+						huh.NewOption("A drink", drinks),
+					),
+			),
+
+			huh.NewGroup(
+				huh.NewSelect[string]().
+					Title("Okay, what kind of fruit are you in the mood for?").
+					Options(
 						huh.NewOption("Tangerine", "tangerine"),
 						huh.NewOption("Canteloupe", "canteloupe"),
 						huh.NewOption("Pomelo", "pomelo"),
 						huh.NewOption("Grapefruit", "grapefruit"),
-					}
-				case vegetables:
-					return opts{
-						huh.NewOption("Tangerine", "carrot"),
+					).
+					Value(&choice),
+			).WithHideFunc(func() bool { return category != fruits }),
+
+			huh.NewGroup(
+				huh.NewSelect[string]().
+					Title("Okay, what kind of vegetable are you in the mood for?").
+					Options(
+						huh.NewOption("Carrot", "carrot"),
 						huh.NewOption("Jicama", "jicama"),
 						huh.NewOption("Kohlrabi", "kohlrabi"),
 						huh.NewOption("Fennel", "fennel"),
 						huh.NewOption("Ginger", "ginger"),
-					}
-				case drinks:
-					return opts{
+					).
+					Value(&choice),
+			).WithHideFunc(func() bool { return category != vegetables }),
+
+			huh.NewGroup(
+				huh.NewSelect[string]().
+					Title(fmt.Sprintf("Okay, what kind of %s are you in the mood for?", category)).
+					Options(
 						huh.NewOption("Coffee", "coffee"),
 						huh.NewOption("Tea", "tea"),
 						huh.NewOption("Bubble Tea", "bubble tea"),
 						huh.NewOption("Agua Fresca", "agua-fresca"),
-					}
-				default:
-					return nil
-				}
-			}(category)...,
-		).
-		Run()
+					).
+					Value(&choice),
+			).WithHideFunc(func() bool { return category != drinks }),
+		).Run()
 
 	if err != nil {
 		fmt.Println("Trouble in food paradise:", err)