Pretty exit for subcommand with required arg.

[jmbarbier]

Using clap derive for a cli like cli user <USER> <COMMAND>, for the following (derive) code

use clap::{Args, Parser, Subcommand};

#[derive(Parser)]
#[command(version, about, long_about = None)]
#[command(propagate_version = true)]
struct Cli {
    #[command(subcommand)]
    command: Commands,
}

#[derive(Subcommand)]
enum Commands {
    User(UserArgs),
}

#[derive(Args)]
struct UserArgs {
    /// User identifier
    user: String,
    #[clap(subcommand)]
    command: UserSubCommands,
}

#[derive(Subcommand)]
enum UserSubCommands {
    /// Display user
    Display,
    /// Delete user
    Delete,
}

fn main() {
    let _ = Cli::parse();
}

If the user does not provide the username, we have the "pretty exit" :

$ cliq user
Usage: cliq user <USER> <COMMAND>

Commands:
  display  Display user
  delete   Delete user
  help     Print this message or the help of the given subcommand(s)

Arguments:
  <USER>  User identifier

Options:
  -h, --help     Print help
  -V, --version  Print version

With the username and help subcommand, we also have the "pretty exit" :

$ cliq user toto help
Usage: cliq user <USER> <COMMAND>

Commands:
  display  Display user
  ...

But if the user is provided, but not the command, the not so pretty "error exit" is provided

$ cliq user toto

error: 'cliq user' requires a subcommand but one was not provided
  [subcommands: display, delete, help]

Usage: cliq user <USER> <COMMAND>

For more information, try '--help'.

Hence my question : **how can we display the "pretty exit" instead of "error exit" in this case ? (i tried arg_required_else_help, subcommand_required on every possible location, but no success...)

Thank you !!