Run cli and execute a default subcommand

[shaikhu]

Hello 👋
For the simple example below, I have a cli tool with 2 subcommands. This runs as expected e.g.cli basic foo or cli advanced foo.

In hindsight (and with a proper design) the basic search subcommand should have been the main command.

1. It is possible to run Cli with a default subcommand? e.g. I would like cli foo to be treated as cli basic foo.
2. I'd like cli basic foo to continue to work (as well as other subcommands in the future).

@CommandLine.Command(name = "cli", subcommands = {Cli.BasicSearch, Cli.AdvancedSearch}")
public class Cli {
  @CommandLine.Command(name = "basic", description = "runs a basic search")
  public class BasicSearch extends Callable<Integer> {.  
    @Override 
    public Integer call() {
      System.out.println("basic search");
      return 0;
    }
  }
 
 @CommandLine.Command(name = "advanced", description = "runs an advanced search")
  public class AdvancedSearch extends Callable<Integer> {
  @Override 
    public Integer call() {
      System.out.println("advanced search");
      return 0;
    } 
  }
}

Is there a better approach to what I'm trying to achieve?

[remkop]

One way to accomplish this is to let the top-level cli command delegate to the basic subcommand:

• make the top-level cli command implement Callable<Integer> just like the basic subcommand;
• copy all options and positional parameters from the basic subcommand to the top-level cli command
• optionally make these options and positional parameters hidden in the top-level cli command, so they don't show up in the usage help for the top-level command
• in the call method of the top-level command, delegate to the basic command (copy all options/params to an instance of basic, and call its call method)

[shaikhu]

Works great. Thank you!