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1import typing as t
2from gettext import gettext as _
3from gettext import ngettext
4
5from ._compat import get_text_stderr
6from .utils import echo
7from .utils import format_filename
8
9if t.TYPE_CHECKING:
10 from .core import Command
11 from .core import Context
12 from .core import Parameter
13
14
15def _join_param_hints(
16 param_hint: t.Optional[t.Union[t.Sequence[str], str]]
17) -> t.Optional[str]:
18 if param_hint is not None and not isinstance(param_hint, str):
19 return " / ".join(repr(x) for x in param_hint)
20
21 return param_hint
22
23
24class ClickException(Exception):
25 """An exception that Click can handle and show to the user."""
26
27 #: The exit code for this exception.
28 exit_code = 1
29
30 def __init__(self, message: str) -> None:
31 super().__init__(message)
32 self.message = message
33
34 def format_message(self) -> str:
35 return self.message
36
37 def __str__(self) -> str:
38 return self.message
39
40 def show(self, file: t.Optional[t.IO[t.Any]] = None) -> None:
41 if file is None:
42 file = get_text_stderr()
43
44 echo(_("Error: {message}").format(message=self.format_message()), file=file)
45
46
47class UsageError(ClickException):
48 """An internal exception that signals a usage error. This typically
49 aborts any further handling.
50
51 :param message: the error message to display.
52 :param ctx: optionally the context that caused this error. Click will
53 fill in the context automatically in some situations.
54 """
55
56 exit_code = 2
57
58 def __init__(self, message: str, ctx: t.Optional["Context"] = None) -> None:
59 super().__init__(message)
60 self.ctx = ctx
61 self.cmd: t.Optional["Command"] = self.ctx.command if self.ctx else None
62
63 def show(self, file: t.Optional[t.IO[t.Any]] = None) -> None:
64 if file is None:
65 file = get_text_stderr()
66 color = None
67 hint = ""
68 if (
69 self.ctx is not None
70 and self.ctx.command.get_help_option(self.ctx) is not None
71 ):
72 hint = _("Try '{command} {option}' for help.").format(
73 command=self.ctx.command_path, option=self.ctx.help_option_names[0]
74 )
75 hint = f"{hint}\n"
76 if self.ctx is not None:
77 color = self.ctx.color
78 echo(f"{self.ctx.get_usage()}\n{hint}", file=file, color=color)
79 echo(
80 _("Error: {message}").format(message=self.format_message()),
81 file=file,
82 color=color,
83 )
84
85
86class BadParameter(UsageError):
87 """An exception that formats out a standardized error message for a
88 bad parameter. This is useful when thrown from a callback or type as
89 Click will attach contextual information to it (for instance, which
90 parameter it is).
91
92 .. versionadded:: 2.0
93
94 :param param: the parameter object that caused this error. This can
95 be left out, and Click will attach this info itself
96 if possible.
97 :param param_hint: a string that shows up as parameter name. This
98 can be used as alternative to `param` in cases
99 where custom validation should happen. If it is
100 a string it's used as such, if it's a list then
101 each item is quoted and separated.
102 """
103
104 def __init__(
105 self,
106 message: str,
107 ctx: t.Optional["Context"] = None,
108 param: t.Optional["Parameter"] = None,
109 param_hint: t.Optional[str] = None,
110 ) -> None:
111 super().__init__(message, ctx)
112 self.param = param
113 self.param_hint = param_hint
114
115 def format_message(self) -> str:
116 if self.param_hint is not None:
117 param_hint = self.param_hint
118 elif self.param is not None:
119 param_hint = self.param.get_error_hint(self.ctx) # type: ignore
120 else:
121 return _("Invalid value: {message}").format(message=self.message)
122
123 return _("Invalid value for {param_hint}: {message}").format(
124 param_hint=_join_param_hints(param_hint), message=self.message
125 )
126
127
128class MissingParameter(BadParameter):
129 """Raised if click required an option or argument but it was not
130 provided when invoking the script.
131
132 .. versionadded:: 4.0
133
134 :param param_type: a string that indicates the type of the parameter.
135 The default is to inherit the parameter type from
136 the given `param`. Valid values are ``'parameter'``,
137 ``'option'`` or ``'argument'``.
138 """
139
140 def __init__(
141 self,
142 message: t.Optional[str] = None,
143 ctx: t.Optional["Context"] = None,
144 param: t.Optional["Parameter"] = None,
145 param_hint: t.Optional[str] = None,
146 param_type: t.Optional[str] = None,
147 ) -> None:
148 super().__init__(message or "", ctx, param, param_hint)
149 self.param_type = param_type
150
151 def format_message(self) -> str:
152 if self.param_hint is not None:
153 param_hint: t.Optional[str] = self.param_hint
154 elif self.param is not None:
155 param_hint = self.param.get_error_hint(self.ctx) # type: ignore
156 else:
157 param_hint = None
158
159 param_hint = _join_param_hints(param_hint)
160 param_hint = f" {param_hint}" if param_hint else ""
161
162 param_type = self.param_type
163 if param_type is None and self.param is not None:
164 param_type = self.param.param_type_name
165
166 msg = self.message
167 if self.param is not None:
168 msg_extra = self.param.type.get_missing_message(self.param)
169 if msg_extra:
170 if msg:
171 msg += f". {msg_extra}"
172 else:
173 msg = msg_extra
174
175 msg = f" {msg}" if msg else ""
176
177 # Translate param_type for known types.
178 if param_type == "argument":
179 missing = _("Missing argument")
180 elif param_type == "option":
181 missing = _("Missing option")
182 elif param_type == "parameter":
183 missing = _("Missing parameter")
184 else:
185 missing = _("Missing {param_type}").format(param_type=param_type)
186
187 return f"{missing}{param_hint}.{msg}"
188
189 def __str__(self) -> str:
190 if not self.message:
191 param_name = self.param.name if self.param else None
192 return _("Missing parameter: {param_name}").format(param_name=param_name)
193 else:
194 return self.message
195
196
197class NoSuchOption(UsageError):
198 """Raised if click attempted to handle an option that does not
199 exist.
200
201 .. versionadded:: 4.0
202 """
203
204 def __init__(
205 self,
206 option_name: str,
207 message: t.Optional[str] = None,
208 possibilities: t.Optional[t.Sequence[str]] = None,
209 ctx: t.Optional["Context"] = None,
210 ) -> None:
211 if message is None:
212 message = _("No such option: {name}").format(name=option_name)
213
214 super().__init__(message, ctx)
215 self.option_name = option_name
216 self.possibilities = possibilities
217
218 def format_message(self) -> str:
219 if not self.possibilities:
220 return self.message
221
222 possibility_str = ", ".join(sorted(self.possibilities))
223 suggest = ngettext(
224 "Did you mean {possibility}?",
225 "(Possible options: {possibilities})",
226 len(self.possibilities),
227 ).format(possibility=possibility_str, possibilities=possibility_str)
228 return f"{self.message} {suggest}"
229
230
231class BadOptionUsage(UsageError):
232 """Raised if an option is generally supplied but the use of the option
233 was incorrect. This is for instance raised if the number of arguments
234 for an option is not correct.
235
236 .. versionadded:: 4.0
237
238 :param option_name: the name of the option being used incorrectly.
239 """
240
241 def __init__(
242 self, option_name: str, message: str, ctx: t.Optional["Context"] = None
243 ) -> None:
244 super().__init__(message, ctx)
245 self.option_name = option_name
246
247
248class BadArgumentUsage(UsageError):
249 """Raised if an argument is generally supplied but the use of the argument
250 was incorrect. This is for instance raised if the number of values
251 for an argument is not correct.
252
253 .. versionadded:: 6.0
254 """
255
256
257class FileError(ClickException):
258 """Raised if a file cannot be opened."""
259
260 def __init__(self, filename: str, hint: t.Optional[str] = None) -> None:
261 if hint is None:
262 hint = _("unknown error")
263
264 super().__init__(hint)
265 self.ui_filename: str = format_filename(filename)
266 self.filename = filename
267
268 def format_message(self) -> str:
269 return _("Could not open file {filename!r}: {message}").format(
270 filename=self.ui_filename, message=self.message
271 )
272
273
274class Abort(RuntimeError):
275 """An internal signalling exception that signals Click to abort."""
276
277
278class Exit(RuntimeError):
279 """An exception that indicates that the application should exit with some
280 status code.
281
282 :param code: the status code to exit with.
283 """
284
285 __slots__ = ("exit_code",)
286
287 def __init__(self, code: int = 0) -> None:
288 self.exit_code: int = code