Comments (1)
Implementation by https://www.reddit.com/user/Dasher38/
import argparse
def _resolve_arg(name, annotation, x):
if isinstance(x, PositionalArgument):
pass
elif len(name) == 1:
name = f'-{name}'
else:
name = f'--{name.replace("_", "-")}'
if isinstance(x, str):
spec = dict(help=x)
elif isinstance(x, Argument):
spec = x.spec
else:
raise TypeError(f'Unsupported argument specification: {x}')
if 'type' not in spec and annotation is not None:
spec['type'] = annotation
if spec.get('type') == bool and 'action' not in spec:
spec['action'] = 'store_true'
del spec['type']
return (name, spec)
def _resolve_subparser(name, cls):
subparsers, pos_arguments, arguments = _get_arguments(cls.__dict__)
if subparsers:
raise ValueError('Nested subparsers are not allowed')
spec = dict(
description=cls.__doc__
)
return name, spec, pos_arguments, arguments
def _get_arguments(dct):
annotations = dct.get('__annotations__', {})
arguments = {}
pos_arguments = {}
subparsers = {}
for attr, spec in dct.items():
if attr.startswith('__'):
continue
if isinstance(spec, type):
_name, _spec, _pos_arguments, _arguments = _resolve_subparser(attr, spec)
subparsers[_name] = (_spec, _pos_arguments, _arguments)
else:
_name, _spec = _resolve_arg(attr, annotations.get(attr), spec)
if _name.startswith('-'):
arguments[_name] = _spec
else:
pos_arguments[_name] = _spec
return subparsers, pos_arguments, arguments
def _make_parser(dct, subparser_dst='subcommand', parser_spec=None):
parser_spec = parser_spec or {}
parser_spec.setdefault('description', dct.get('__doc__'))
parser = argparse.ArgumentParser(**parser_spec)
subparsers, pos_arguments, arguments = _get_arguments(dct)
for name, spec in pos_arguments.items():
parser.add_argument(name, **spec)
for name, spec in arguments.items():
parser.add_argument(name, **spec)
if subparsers:
_subparsers = parser.add_subparsers(title='subcommands', dest=subparser_dst)
for name, (spec, pos_arguments, arguments) in subparsers.items():
subparser = _subparsers.add_parser(name, **spec)
for name, spec in pos_arguments.items():
subparser.add_argument(name, **spec)
for name, spec in arguments.items():
subparser.add_argument(name, **spec)
return parser
class Argument:
def __init__(self, **kwargs):
self.spec = kwargs
class PositionalArgument(Argument):
pass
class ArgParserMeta(type):
def __new__(cls, name, bases, dct, _is_base=False, subparser_dst='subcommand', **kwargs):
if _is_base:
return super().__new__(cls, name, bases, dct)
else:
return _make_parser(dct, subparser_dst=subparser_dst, parser_spec=kwargs)
class ArgParser(metaclass=ArgParserMeta, _is_base=True):
pass
# class MyParser(ArgParser, subparser_dst='XXX'):
# Any keyword argument other than subparser_dst is forwarded to
# argparse.ArgumentParser
class MyParser(ArgParser, epilog='this is the epilog'):
"""
This is my nice application
"""
a: int = Argument(help='hello')
x: int = PositionalArgument(help='pos1')
y: int = PositionalArgument(help='pos2')
class subcmd:
"my subcommand"
b: float = 'world'
c: bool = 'mybool'
a_long_opt: bool = 'bar'
args = MyParser.parse_args()
print(args)
from aaargs.
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from aaargs.