How to use the flag package for building interactive command-line menus in Go?

To build interactive command-line menus in Go using the flag package, you need to combine the flag package with some additional logic to create the menu experience. Here's a step-by-step guide on how to use the flag package for building interactive command-line menus in Go:

Step 1: Import necessary packages

import (
    "flag"
    "fmt"
    "os"
)

Step 2: Define menu options using flag package

// Define flag options with default values
option1 := flag.Bool("option1", false, "Description of option 1")
option2 := flag.String("option2", "", "Description of option 2")
// Add more options as needed

Step 3: Parse command-line flags

flag.Parse()

Step 4: Handle menu options based on user input

// Access flag values and perform corresponding actions
if *option1 {
    fmt.Println("Option 1 selected")
    // Perform action for option 1
}

if *option2 != "" {
    fmt.Println("Option 2 value:", *option2)
    // Perform action with option 2 value
}

// Add more if conditions for additional options

Step 5: Run the program and test the menu

$ go run main.go -option1 -option2 "value"

In this example, the user can select options using command-line flags. You can customize the options, their descriptions, and actions based on your specific needs.