sarc --help
usage: sarc [-h] [-v] {acquire,db} ...

optional arguments:
  -h, --help     show this help message and exit

CLI ['command']:
  CLI(command: 'Union[Acquire, Db]', verbose: 'int' = 0)

  -v, --verbose  logging levels of information about the process (-v: INFO. -vv: DEBUG) (default: 0)

command:
  {acquire,db}

import argparse
from typing import Union
from typing_extensions import Literal
from simple_parsing import ArgumentParser
from dataclasses import dataclass
from simple_parsing import subparsers
from pathlib import Path
from sarc.common.format import HelpAction


@dataclass
class GlobalArgs:
    """Global args."""

    verbose: bool = False
    debug: bool = False


@dataclass
class Db:
    """Db help"""

    name: str
    bar: int = 0  # bar help
    

    def execute(self):
        print(f"Executing {self}")


@dataclass
class Acquire:
    """Acquire help"""
    
    
    @dataclass
    class Allocations:
        file: Path
    
    @dataclass
    class Jobs:
        file: Path
    
    @dataclass
    class Storages:
        file: Path

    command: Union[Allocations, Jobs, Storages] = subparsers(
        {
            "allocations": Allocations,
            "jobs": Jobs,
            "storages": Storages,
        }
    )
    
    def execute(self):
        print(f"Executing {self}")


def main():
    parser = ArgumentParser(prog="test", add_help=False)
    parser.add_argument(
        "-h", "--help", action=HelpAction, help="show this help message and exit"
    )
    
    parser.add_arguments(GlobalArgs, dest="global_args")

    command_subparsers = parser.add_subparsers(
        dest="command_name",
        title="Command title",
        description="Description",
        required=True,
    )

    db_parser = command_subparsers.add_parser("db", help="DB help")
    db_parser.add_arguments(Db, dest="command")

    acquire_parser = command_subparsers.add_parser("acquire", help="Acquire help")
    acquire_parser.add_arguments(Acquire, dest="command")

    args = parser.parse_args()

    global_args: GlobalArgs = args.global_args
    chosen_command_name: str = args.command_name

    command: Db | Acquire = args.command
    command.execute()


if __name__ == "__main__":
    main()

python args.py --help
 help                                     HelpAction
 db                                       _SubParsersAction
   help                                   _HelpAction
 acquire                                  _SubParsersAction
   help                                   _HelpAction
 global_args.verbose                      BooleanOptionalAction
 global_args.debug                        BooleanOptionalAction

from argparse import ArgumentParser
from dataclasses import dataclass, field, fields
from typing import Optional

def subparser(datacls, dest=None):
    return field(metadata={"type": "subparser", "datacls": datacls, "dest": dest}, default=None)
    

@dataclass
class Allocations:
    file: str


@dataclass
class Jobs:
    file: str


@dataclass
class Storages:
    file: str


@dataclass
class Acquire:
    allocations: Optional[Allocations] = subparser(Allocations, 'subcmd')
    jobs: Optional[Jobs] = subparser(Jobs, 'subcmd')
    storages: Optional[Storages] = subparser(Storages, 'subcmd')
    

@dataclass
class CommandLineInterface:
    acquire: Acquire = subparser(Acquire, 'cmd')


def add_arguments(parser: ArgumentParser, dataclass):
    subparsers = dict()
    
    for field in fields(dataclass):
        # print(field)
        
        fieldtype = field.metadata.get('type')
        
        if fieldtype == 'subparser':
            dest = field.metadata.get('dest')
            dtcls = field.metadata.get('datacls')
            
            # Group subparser by destination
            subparser = subparsers.get(dest)
            if subparser is None :
                subparser = parser.add_subparsers(dest=dest)
                subparsers[dest] = subparser
                
            cmdparser = subparser.add_parser(field.name)
            add_arguments(cmdparser, dtcls)
        else:
            parser.add_argument(field.name)
        

from sarc.common.format import HelpAction
    
parser = ArgumentParser(add_help=False)
parser.add_argument(
    "-h", "--help", action=HelpAction, help="show this help message and exit"
)
add_arguments(parser, CommandLineInterface)

args = parser.parse_args()

 acquire                                  _SubParsersAction
   allocations                            _SubParsersAction
     file                                 _StoreAction
     help                                 _HelpAction
   jobs                                   _SubParsersAction
     file                                 _StoreAction
     help                                 _HelpAction
   storages                               _SubParsersAction
     file                                 _StoreAction
     help                                 _HelpAction
   help                                   _HelpAction
 help                                     HelpAction