84 lines
2.5 KiB
Python
84 lines
2.5 KiB
Python
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#!/usr/bin/env python3
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# -*- encoding: utf-8 -*-
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import re
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from inspect import _empty, getfullargspec, signature
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from typing import Callable, Dict, List, Optional, Set, Type, TypeVar
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from .table_fmt import table_fmt
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SPLITTER_RGX = re.compile(r'(?<!\~):')
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def unescape_after_splitter(txt: str) -> str:
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return txt.replace('~:', ':')
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T = TypeVar('T')
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def parse_cmdline(func: Callable[..., T], encoded_args: str) -> Optional[T]:
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'''
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Transforms a colon-separated key-pairs into callable arguments
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Type-annotated fields will be converted.
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'''
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split_args = SPLITTER_RGX.split(encoded_args)
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split_args = list(map(unescape_after_splitter, split_args))
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brute_dict = dict(zip(split_args[0::2], split_args[1::2]))
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full_arg_spec = getfullargspec(func)
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sig = signature(func)
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func_args = full_arg_spec.args
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func_annotations = full_arg_spec.annotations
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str_args = {k: v
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for k, v in
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brute_dict.items()
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if k in func_args}
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unknown_args = {k: v
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for k, v in
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brute_dict.items()
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if k not in func_args}
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if encoded_args == 'help' or len(unknown_args) > 0:
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if len(unknown_args) > 0:
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print('Unknown arguments found:')
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for k, v in unknown_args.items():
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print(f' {k}: {repr(v)}')
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print()
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print(f'Usage help for: {func.__module__}.{func.__name__}')
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tbl = list()
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for name, parameter in sig.parameters.items():
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annotation = parameter.annotation if parameter.annotation != _empty else str
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tbl.append((
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str(name),
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repr(annotation),
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repr(parameter.default) if parameter.default != _empty else '-unset-',
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))
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print(table_fmt(
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'name,type,default'.split(','),
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tbl,
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alignment='^'*3,
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))
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return None
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kwargs = dict()
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for key in str_args:
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kwargs[key] = convert_type(
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func_annotations.get(key, str),
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str_args[key]
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)
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print(f'Calling {func.__module__}.{func.__name__} with arguments:')
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if len(kwargs) <= 0:
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print(' --- no arguments given ---')
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else:
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for k, v in kwargs.items():
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print(f' {k}: {repr(v)}')
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return func(**kwargs)
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K = TypeVar('K')
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def convert_type(cls: Type[K], data: str) -> K:
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if cls not in (str, int, float):
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cls = eval
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return cls(data)
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