438 lines
14 KiB
Python
438 lines
14 KiB
Python
import inspect
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import types
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import typing as t
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from functools import update_wrapper
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from gettext import gettext as _
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from .core import Argument
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from .core import Command
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from .core import Context
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from .core import Group
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from .core import Option
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from .core import Parameter
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from .globals import get_current_context
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from .utils import echo
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F = t.TypeVar("F", bound=t.Callable[..., t.Any])
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FC = t.TypeVar("FC", t.Callable[..., t.Any], Command)
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def pass_context(f: F) -> F:
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"""Marks a callback as wanting to receive the current context
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object as first argument.
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"""
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def new_func(*args, **kwargs): # type: ignore
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return f(get_current_context(), *args, **kwargs)
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return update_wrapper(t.cast(F, new_func), f)
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def pass_obj(f: F) -> F:
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"""Similar to :func:`pass_context`, but only pass the object on the
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context onwards (:attr:`Context.obj`). This is useful if that object
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represents the state of a nested system.
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"""
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def new_func(*args, **kwargs): # type: ignore
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return f(get_current_context().obj, *args, **kwargs)
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return update_wrapper(t.cast(F, new_func), f)
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def make_pass_decorator(
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object_type: t.Type, ensure: bool = False
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) -> "t.Callable[[F], F]":
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"""Given an object type this creates a decorator that will work
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similar to :func:`pass_obj` but instead of passing the object of the
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current context, it will find the innermost context of type
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:func:`object_type`.
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This generates a decorator that works roughly like this::
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from functools import update_wrapper
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def decorator(f):
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@pass_context
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def new_func(ctx, *args, **kwargs):
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obj = ctx.find_object(object_type)
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return ctx.invoke(f, obj, *args, **kwargs)
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return update_wrapper(new_func, f)
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return decorator
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:param object_type: the type of the object to pass.
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:param ensure: if set to `True`, a new object will be created and
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remembered on the context if it's not there yet.
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"""
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def decorator(f: F) -> F:
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def new_func(*args, **kwargs): # type: ignore
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ctx = get_current_context()
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if ensure:
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obj = ctx.ensure_object(object_type)
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else:
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obj = ctx.find_object(object_type)
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if obj is None:
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raise RuntimeError(
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"Managed to invoke callback without a context"
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f" object of type {object_type.__name__!r}"
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" existing."
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)
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return ctx.invoke(f, obj, *args, **kwargs)
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return update_wrapper(t.cast(F, new_func), f)
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return decorator
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def pass_meta_key(
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key: str, *, doc_description: t.Optional[str] = None
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) -> "t.Callable[[F], F]":
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"""Create a decorator that passes a key from
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:attr:`click.Context.meta` as the first argument to the decorated
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function.
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:param key: Key in ``Context.meta`` to pass.
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:param doc_description: Description of the object being passed,
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inserted into the decorator's docstring. Defaults to "the 'key'
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key from Context.meta".
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.. versionadded:: 8.0
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"""
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def decorator(f: F) -> F:
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def new_func(*args, **kwargs): # type: ignore
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ctx = get_current_context()
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obj = ctx.meta[key]
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return ctx.invoke(f, obj, *args, **kwargs)
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return update_wrapper(t.cast(F, new_func), f)
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if doc_description is None:
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doc_description = f"the {key!r} key from :attr:`click.Context.meta`"
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decorator.__doc__ = (
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f"Decorator that passes {doc_description} as the first argument"
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" to the decorated function."
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)
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return decorator
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def _make_command(
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f: F,
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name: t.Optional[str],
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attrs: t.MutableMapping[str, t.Any],
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cls: t.Type[Command],
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) -> Command:
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if isinstance(f, Command):
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raise TypeError("Attempted to convert a callback into a command twice.")
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try:
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params = f.__click_params__ # type: ignore
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params.reverse()
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del f.__click_params__ # type: ignore
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except AttributeError:
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params = []
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help = attrs.get("help")
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if help is None:
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help = inspect.getdoc(f)
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else:
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help = inspect.cleandoc(help)
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attrs["help"] = help
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return cls(
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name=name or f.__name__.lower().replace("_", "-"),
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callback=f,
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params=params,
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**attrs,
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)
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def command(
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name: t.Optional[str] = None,
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cls: t.Optional[t.Type[Command]] = None,
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**attrs: t.Any,
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) -> t.Callable[[F], Command]:
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r"""Creates a new :class:`Command` and uses the decorated function as
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callback. This will also automatically attach all decorated
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:func:`option`\s and :func:`argument`\s as parameters to the command.
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The name of the command defaults to the name of the function with
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underscores replaced by dashes. If you want to change that, you can
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pass the intended name as the first argument.
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All keyword arguments are forwarded to the underlying command class.
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Once decorated the function turns into a :class:`Command` instance
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that can be invoked as a command line utility or be attached to a
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command :class:`Group`.
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:param name: the name of the command. This defaults to the function
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name with underscores replaced by dashes.
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:param cls: the command class to instantiate. This defaults to
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:class:`Command`.
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"""
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if cls is None:
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cls = Command
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def decorator(f: t.Callable[..., t.Any]) -> Command:
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cmd = _make_command(f, name, attrs, cls) # type: ignore
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cmd.__doc__ = f.__doc__
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return cmd
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return decorator
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def group(name: t.Optional[str] = None, **attrs: t.Any) -> t.Callable[[F], Group]:
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"""Creates a new :class:`Group` with a function as callback. This
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works otherwise the same as :func:`command` just that the `cls`
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parameter is set to :class:`Group`.
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"""
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attrs.setdefault("cls", Group)
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return t.cast(Group, command(name, **attrs))
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def _param_memo(f: FC, param: Parameter) -> None:
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if isinstance(f, Command):
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f.params.append(param)
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else:
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if not hasattr(f, "__click_params__"):
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f.__click_params__ = [] # type: ignore
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f.__click_params__.append(param) # type: ignore
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def argument(*param_decls: str, **attrs: t.Any) -> t.Callable[[FC], FC]:
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"""Attaches an argument to the command. All positional arguments are
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passed as parameter declarations to :class:`Argument`; all keyword
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arguments are forwarded unchanged (except ``cls``).
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This is equivalent to creating an :class:`Argument` instance manually
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and attaching it to the :attr:`Command.params` list.
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:param cls: the argument class to instantiate. This defaults to
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:class:`Argument`.
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"""
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def decorator(f: FC) -> FC:
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ArgumentClass = attrs.pop("cls", Argument)
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_param_memo(f, ArgumentClass(param_decls, **attrs))
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return f
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return decorator
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def option(*param_decls: str, **attrs: t.Any) -> t.Callable[[FC], FC]:
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"""Attaches an option to the command. All positional arguments are
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passed as parameter declarations to :class:`Option`; all keyword
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arguments are forwarded unchanged (except ``cls``).
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This is equivalent to creating an :class:`Option` instance manually
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and attaching it to the :attr:`Command.params` list.
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:param cls: the option class to instantiate. This defaults to
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:class:`Option`.
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"""
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def decorator(f: FC) -> FC:
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# Issue 926, copy attrs, so pre-defined options can re-use the same cls=
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option_attrs = attrs.copy()
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if "help" in option_attrs:
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option_attrs["help"] = inspect.cleandoc(option_attrs["help"])
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OptionClass = option_attrs.pop("cls", Option)
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_param_memo(f, OptionClass(param_decls, **option_attrs))
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return f
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return decorator
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def confirmation_option(*param_decls: str, **kwargs: t.Any) -> t.Callable[[FC], FC]:
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"""Add a ``--yes`` option which shows a prompt before continuing if
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not passed. If the prompt is declined, the program will exit.
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:param param_decls: One or more option names. Defaults to the single
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value ``"--yes"``.
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:param kwargs: Extra arguments are passed to :func:`option`.
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"""
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def callback(ctx: Context, param: Parameter, value: bool) -> None:
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if not value:
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ctx.abort()
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if not param_decls:
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param_decls = ("--yes",)
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kwargs.setdefault("is_flag", True)
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kwargs.setdefault("callback", callback)
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kwargs.setdefault("expose_value", False)
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kwargs.setdefault("prompt", "Do you want to continue?")
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kwargs.setdefault("help", "Confirm the action without prompting.")
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return option(*param_decls, **kwargs)
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def password_option(*param_decls: str, **kwargs: t.Any) -> t.Callable[[FC], FC]:
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"""Add a ``--password`` option which prompts for a password, hiding
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input and asking to enter the value again for confirmation.
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:param param_decls: One or more option names. Defaults to the single
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value ``"--password"``.
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:param kwargs: Extra arguments are passed to :func:`option`.
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"""
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if not param_decls:
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param_decls = ("--password",)
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kwargs.setdefault("prompt", True)
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kwargs.setdefault("confirmation_prompt", True)
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kwargs.setdefault("hide_input", True)
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return option(*param_decls, **kwargs)
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def version_option(
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version: t.Optional[str] = None,
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*param_decls: str,
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package_name: t.Optional[str] = None,
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prog_name: t.Optional[str] = None,
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message: t.Optional[str] = None,
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**kwargs: t.Any,
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) -> t.Callable[[FC], FC]:
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"""Add a ``--version`` option which immediately prints the version
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number and exits the program.
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If ``version`` is not provided, Click will try to detect it using
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:func:`importlib.metadata.version` to get the version for the
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``package_name``. On Python < 3.8, the ``importlib_metadata``
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backport must be installed.
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If ``package_name`` is not provided, Click will try to detect it by
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inspecting the stack frames. This will be used to detect the
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version, so it must match the name of the installed package.
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:param version: The version number to show. If not provided, Click
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will try to detect it.
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:param param_decls: One or more option names. Defaults to the single
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value ``"--version"``.
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:param package_name: The package name to detect the version from. If
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not provided, Click will try to detect it.
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:param prog_name: The name of the CLI to show in the message. If not
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provided, it will be detected from the command.
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:param message: The message to show. The values ``%(prog)s``,
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``%(package)s``, and ``%(version)s`` are available. Defaults to
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``"%(prog)s, version %(version)s"``.
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:param kwargs: Extra arguments are passed to :func:`option`.
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:raise RuntimeError: ``version`` could not be detected.
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.. versionchanged:: 8.0
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Add the ``package_name`` parameter, and the ``%(package)s``
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value for messages.
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.. versionchanged:: 8.0
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Use :mod:`importlib.metadata` instead of ``pkg_resources``. The
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version is detected based on the package name, not the entry
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point name. The Python package name must match the installed
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package name, or be passed with ``package_name=``.
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"""
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if message is None:
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message = _("%(prog)s, version %(version)s")
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if version is None and package_name is None:
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frame = inspect.currentframe()
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assert frame is not None
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assert frame.f_back is not None
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f_globals = frame.f_back.f_globals if frame is not None else None
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# break reference cycle
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# https://docs.python.org/3/library/inspect.html#the-interpreter-stack
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del frame
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if f_globals is not None:
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package_name = f_globals.get("__name__")
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if package_name == "__main__":
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package_name = f_globals.get("__package__")
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if package_name:
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package_name = package_name.partition(".")[0]
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def callback(ctx: Context, param: Parameter, value: bool) -> None:
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if not value or ctx.resilient_parsing:
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return
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nonlocal prog_name
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nonlocal version
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if prog_name is None:
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prog_name = ctx.find_root().info_name
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if version is None and package_name is not None:
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metadata: t.Optional[types.ModuleType]
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try:
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from importlib import metadata # type: ignore
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except ImportError:
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# Python < 3.8
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import importlib_metadata as metadata # type: ignore
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try:
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version = metadata.version(package_name) # type: ignore
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except metadata.PackageNotFoundError: # type: ignore
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raise RuntimeError(
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f"{package_name!r} is not installed. Try passing"
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" 'package_name' instead."
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)
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if version is None:
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raise RuntimeError(
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f"Could not determine the version for {package_name!r} automatically."
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)
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echo(
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t.cast(str, message)
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% {"prog": prog_name, "package": package_name, "version": version},
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color=ctx.color,
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)
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ctx.exit()
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if not param_decls:
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param_decls = ("--version",)
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kwargs.setdefault("is_flag", True)
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kwargs.setdefault("expose_value", False)
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kwargs.setdefault("is_eager", True)
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kwargs.setdefault("help", _("Show the version and exit."))
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kwargs["callback"] = callback
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return option(*param_decls, **kwargs)
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def help_option(*param_decls: str, **kwargs: t.Any) -> t.Callable[[FC], FC]:
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"""Add a ``--help`` option which immediately prints the help page
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and exits the program.
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This is usually unnecessary, as the ``--help`` option is added to
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each command automatically unless ``add_help_option=False`` is
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passed.
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:param param_decls: One or more option names. Defaults to the single
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value ``"--help"``.
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:param kwargs: Extra arguments are passed to :func:`option`.
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"""
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def callback(ctx: Context, param: Parameter, value: bool) -> None:
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if not value or ctx.resilient_parsing:
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return
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echo(ctx.get_help(), color=ctx.color)
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ctx.exit()
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if not param_decls:
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param_decls = ("--help",)
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kwargs.setdefault("is_flag", True)
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kwargs.setdefault("expose_value", False)
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kwargs.setdefault("is_eager", True)
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kwargs.setdefault("help", _("Show this message and exit."))
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kwargs["callback"] = callback
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return option(*param_decls, **kwargs)
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