Custom Flag Error

package main

import (
    "fmt"

    "github.com/leaanthony/clir"
)

func customFlagError(cmdPath string, err error) error {
    return fmt.Errorf(`%s 
flag v0.0.1 - A custom error example

Flags:

  --help
    Get help on the '%s' command`, err, cmdPath)
}

func main() {

    // Create new cli
    cli := clir.NewCli("flag", "A custom error example", "v0.0.1")

    cli.SetErrorFunction(customFlagError)

    cli.NewSubCommand("test", "Testing whether subcommand path returns correctly via err callback")

    // Run!
    if err := cli.Run(); err != nil {
        fmt.Println(err)
    }

}