MWPath

class lsst.daf.butler.cli.utils.MWPath(exists=None, file_okay=True, dir_okay=True, writable=False, readable=True, resolve_path=False, allow_dash=False, path_type=None)

Bases: Path

Overrides click.Path to implement file-does-not-exist checking.

Changes the definition of exists` so that `True` indicates the location (file or directory) must exist, `False` indicates the location must *not* exist, and `None` indicates that the file may exist or not. The standard definition for the `click.Path` ``exists parameter is that for True a location must exist, but False means it is not required to exist (not that it is required to not exist).

Parameters:

existsTrue, False, or None

If True, the location (file or directory) indicated by the caller must exist. If False the location must not exist. If None, the location may exist or not.

For other parameters see `click.Path`.

Attributes Summary

arity
envvar_list_splitter	if a list of this type is expected and the value is pulled from a string environment variable, this is what splits it up.
is_composite

Methods Summary

__call__(value[, param, ctx])	Call self as a function.
coerce_path_result(rv)
convert(value, param, ctx)	Called by click.ParamType to "convert values through types".
fail(message[, param, ctx])	Helper method to fail with an invalid value message.
get_metavar(param)	Returns the metavar default for this param if it provides one.
get_missing_message(param)	Optionally might return extra information about a missing parameter.
shell_complete(ctx, param, incomplete)	Return a special completion marker that tells the completion system to use the shell to provide path completions for only directories or any paths.
split_envvar_value(rv)	Given a value from an environment variable this splits it up into small chunks depending on the defined envvar list splitter.
to_info_dict()	Gather information that could be useful for a tool generating user-facing documentation.

Attributes Documentation

arity: t.ClassVar[int] = 1

envvar_list_splitter: t.ClassVar[t.Optional[str]] = ':'

if a list of this type is expected and the value is pulled from a string environment variable, this is what splits it up. None means any whitespace. For all parameters the general rule is that whitespace splits them up. The exception are paths and files which are split by os.path.pathsep by default (“:” on Unix and “;” on Windows).

is_composite: t.ClassVar[bool] = False

Methods Documentation

__call__(value: Any, param: Optional[Parameter] = None, ctx: Optional[Context] = None) → Any

Call self as a function.

coerce_path_result(rv: Any) → Any

convert(value, param, ctx)

Called by click.ParamType to “convert values through types”. click.Path uses this step to verify Path conditions.

fail(message: str, param: Optional[Parameter] = None, ctx: Optional[Context] = None) → t.NoReturn

Helper method to fail with an invalid value message.

get_metavar(param: Parameter) → Optional[str]

Returns the metavar default for this param if it provides one.

get_missing_message(param: Parameter) → Optional[str]

Optionally might return extra information about a missing parameter.

New in version 2.0.

shell_complete(ctx: Context, param: Parameter, incomplete: str) → List[CompletionItem]

Return a special completion marker that tells the completion system to use the shell to provide path completions for only directories or any paths.

Parameters:

• ctx – Invocation context for this command.

• param – The parameter that is requesting completion.

• incomplete – Value being completed. May be empty.

New in version 8.0.

split_envvar_value(rv: str) → Sequence[str]

Given a value from an environment variable this splits it up into small chunks depending on the defined envvar list splitter.

If the splitter is set to None, which means that whitespace splits, then leading and trailing whitespace is ignored. Otherwise, leading and trailing splitters usually lead to empty items being included.

to_info_dict() → Dict[str, Any]

Gather information that could be useful for a tool generating user-facing documentation.

Use click.Context.to_info_dict() to traverse the entire CLI structure.

New in version 8.0.