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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