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import typing as t
from gettext import gettext as _
from gettext import ngettext
from ._compat import get_text_stderr
from .utils import echo
from .utils import format_filename
if t.TYPE_CHECKING:
from .core import Command
from .core import Context
from .core import Parameter
def _join_param_hints(
param_hint: t.Optional[t.Union[t.Sequence[str], str]]
) -> t.Optional[str]:
if param_hint is not None and not isinstance(param_hint, str):
return " / ".join(repr(x) for x in param_hint)
return param_hint
class ClickException(Exception):
"""An exception that Click can handle and show to the user."""
#: The exit code for this exception.
exit_code = 1
def __init__(self, message: str) -> None:
super().__init__(message)
self.message = message
def format_message(self) -> str:
return self.message
def __str__(self) -> str:
return self.message
def show(self, file: t.Optional[t.IO[t.Any]] = None) -> None:
if file is None:
file = get_text_stderr()
echo(_("Error: {message}").format(message=self.format_message()), file=file)
class UsageError(ClickException):
"""An internal exception that signals a usage error. This typically
aborts any further handling.
:param message: the error message to display.
:param ctx: optionally the context that caused this error. Click will
fill in the context automatically in some situations.
"""
exit_code = 2
def __init__(self, message: str, ctx: t.Optional["Context"] = None) -> None:
super().__init__(message)
self.ctx = ctx
self.cmd: t.Optional["Command"] = self.ctx.command if self.ctx else None
def show(self, file: t.Optional[t.IO[t.Any]] = None) -> None:
if file is None:
file = get_text_stderr()
color = None
hint = ""
if (
self.ctx is not None
and self.ctx.command.get_help_option(self.ctx) is not None
):
hint = _("Try '{command} {option}' for help.").format(
command=self.ctx.command_path, option=self.ctx.help_option_names[0]
)
hint = f"{hint}\n"
if self.ctx is not None:
color = self.ctx.color
echo(f"{self.ctx.get_usage()}\n{hint}", file=file, color=color)
echo(
_("Error: {message}").format(message=self.format_message()),
file=file,
color=color,
)
class BadParameter(UsageError):
"""An exception that formats out a standardized error message for a
bad parameter. This is useful when thrown from a callback or type as
Click will attach contextual information to it (for instance, which
parameter it is).
.. versionadded:: 2.0
:param param: the parameter object that caused this error. This can
be left out, and Click will attach this info itself
if possible.
:param param_hint: a string that shows up as parameter name. This
can be used as alternative to `param` in cases
where custom validation should happen. If it is
a string it's used as such, if it's a list then
each item is quoted and separated.
"""
def __init__(
self,
message: str,
ctx: t.Optional["Context"] = None,
param: t.Optional["Parameter"] = None,
param_hint: t.Optional[str] = None,
) -> None:
super().__init__(message, ctx)
self.param = param
self.param_hint = param_hint
def format_message(self) -> str:
if self.param_hint is not None:
param_hint = self.param_hint
elif self.param is not None:
param_hint = self.param.get_error_hint(self.ctx) # type: ignore
else:
return _("Invalid value: {message}").format(message=self.message)
return _("Invalid value for {param_hint}: {message}").format(
param_hint=_join_param_hints(param_hint), message=self.message
)
class MissingParameter(BadParameter):
"""Raised if click required an option or argument but it was not
provided when invoking the script.
.. versionadded:: 4.0
:param param_type: a string that indicates the type of the parameter.
The default is to inherit the parameter type from
the given `param`. Valid values are ``'parameter'``,
``'option'`` or ``'argument'``.
"""
def __init__(
self,
message: t.Optional[str] = None,
ctx: t.Optional["Context"] = None,
param: t.Optional["Parameter"] = None,
param_hint: t.Optional[str] = None,
param_type: t.Optional[str] = None,
) -> None:
super().__init__(message or "", ctx, param, param_hint)
self.param_type = param_type
def format_message(self) -> str:
if self.param_hint is not None:
param_hint: t.Optional[str] = self.param_hint
elif self.param is not None:
param_hint = self.param.get_error_hint(self.ctx) # type: ignore
else:
param_hint = None
param_hint = _join_param_hints(param_hint)
param_hint = f" {param_hint}" if param_hint else ""
param_type = self.param_type
if param_type is None and self.param is not None:
param_type = self.param.param_type_name
msg = self.message
if self.param is not None:
msg_extra = self.param.type.get_missing_message(self.param)
if msg_extra:
if msg:
msg += f". {msg_extra}"
else:
msg = msg_extra
msg = f" {msg}" if msg else ""
# Translate param_type for known types.
if param_type == "argument":
missing = _("Missing argument")
elif param_type == "option":
missing = _("Missing option")
elif param_type == "parameter":
missing = _("Missing parameter")
else:
missing = _("Missing {param_type}").format(param_type=param_type)
return f"{missing}{param_hint}.{msg}"
def __str__(self) -> str:
if not self.message:
param_name = self.param.name if self.param else None
return _("Missing parameter: {param_name}").format(param_name=param_name)
else:
return self.message
class NoSuchOption(UsageError):
"""Raised if click attempted to handle an option that does not
exist.
.. versionadded:: 4.0
"""
def __init__(
self,
option_name: str,
message: t.Optional[str] = None,
possibilities: t.Optional[t.Sequence[str]] = None,
ctx: t.Optional["Context"] = None,
) -> None:
if message is None:
message = _("No such option: {name}").format(name=option_name)
super().__init__(message, ctx)
self.option_name = option_name
self.possibilities = possibilities
def format_message(self) -> str:
if not self.possibilities:
return self.message
possibility_str = ", ".join(sorted(self.possibilities))
suggest = ngettext(
"Did you mean {possibility}?",
"(Possible options: {possibilities})",
len(self.possibilities),
).format(possibility=possibility_str, possibilities=possibility_str)
return f"{self.message} {suggest}"
class BadOptionUsage(UsageError):
"""Raised if an option is generally supplied but the use of the option
was incorrect. This is for instance raised if the number of arguments
for an option is not correct.
.. versionadded:: 4.0
:param option_name: the name of the option being used incorrectly.
"""
def __init__(
self, option_name: str, message: str, ctx: t.Optional["Context"] = None
) -> None:
super().__init__(message, ctx)
self.option_name = option_name
class BadArgumentUsage(UsageError):
"""Raised if an argument is generally supplied but the use of the argument
was incorrect. This is for instance raised if the number of values
for an argument is not correct.
.. versionadded:: 6.0
"""
class FileError(ClickException):
"""Raised if a file cannot be opened."""
def __init__(self, filename: str, hint: t.Optional[str] = None) -> None:
if hint is None:
hint = _("unknown error")
super().__init__(hint)
self.ui_filename: str = format_filename(filename)
self.filename = filename
def format_message(self) -> str:
return _("Could not open file {filename!r}: {message}").format(
filename=self.ui_filename, message=self.message
)
class Abort(RuntimeError):
"""An internal signalling exception that signals Click to abort."""
class Exit(RuntimeError):
"""An exception that indicates that the application should exit with some
status code.
:param code: the status code to exit with.
"""
__slots__ = ("exit_code",)
def __init__(self, code: int = 0) -> None:
self.exit_code: int = code