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