Required if another flag is defined

[theprobugmaker]

How can I make a flag required if another flag is set?

For example, I have a flag that enables (bool) a feature, I want to make all the flags for that feature required if it's enabled.

Thank you

[tirkarthi]

Does dynamically marking the flag as required in hooks help? Here email is marked as required when username is "test"

package cmd

import (
	"fmt"

	"github.com/spf13/cobra"
)

var createCmd = &cobra.Command{
	Use:   "create",
	Short: "Create user",
	Long:  `Create user with given username and email`,
	PreRun: func(cmd *cobra.Command, args []string) {
		username, _ := cmd.Flags().GetString("username")
		if username == "test" {
			cmd.MarkFlagRequired("email")
		}
	},
	RunE: func(cmd *cobra.Command, args []string) error {
		username, _ := cmd.Flags().GetString("username")
		email, _ := cmd.Flags().GetString("email")

		fmt.Println("Username", username)
		fmt.Println("Email", email)

		return nil

	},
}

func init() {
	createCmd.Flags().StringP("username", "u", "", "Username for the user")
	createCmd.Flags().StringP("email", "e", "", "Email of the user")
	createCmd.MarkFlagRequired("username")
}

[johnSchnake]

I think that is the way to go and which is why I think it was intentional that the flag parsing happens before pre run hooks but the validation happens after them.