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from textwrap import dedent
from typing import Callable, Union
# doc decorator function ported with modifications from Pandas
# https://github.com/pandas-dev/pandas/blob/master/pandas/util/_decorators.py
def doc(*docstrings: Union[str, Callable], **params) -> Callable:
"""
A decorator take docstring templates, concatenate them and perform string
substitution on it.
This decorator will add a variable "_docstring_components" to the wrapped
callable to keep track the original docstring template for potential usage.
If it should be consider as a template, it will be saved as a string.
Otherwise, it will be saved as callable, and later user __doc__ and dedent
to get docstring.
Parameters
----------
*docstrings : str or callable
The string / docstring / docstring template to be appended in order
after default docstring under callable.
**params
The string which would be used to format docstring template.
"""
def decorator(decorated: Callable) -> Callable:
# collecting docstring and docstring templates
docstring_components: list[Union[str, Callable]] = []
if decorated.__doc__:
docstring_components.append(dedent(decorated.__doc__))
for docstring in docstrings:
if hasattr(docstring, "_docstring_components"):
docstring_components.extend(docstring._docstring_components)
elif isinstance(docstring, str) or docstring.__doc__:
docstring_components.append(docstring)
# formatting templates and concatenating docstring
decorated.__doc__ = "".join(
component.format(**params)
if isinstance(component, str)
else dedent(component.__doc__ or "")
for component in docstring_components
)
decorated._docstring_components = docstring_components
return decorated
return decorator
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