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- from typing import Any, Generic, List, Optional, TextIO, TypeVar, Union, overload
- from . import get_console
- from .console import Console
- from .text import Text, TextType
- PromptType = TypeVar("PromptType")
- DefaultType = TypeVar("DefaultType")
- class PromptError(Exception):
- """Exception base class for prompt related errors."""
- class InvalidResponse(PromptError):
- """Exception to indicate a response was invalid. Raise this within process_response() to indicate an error
- and provide an error message.
- Args:
- message (Union[str, Text]): Error message.
- """
- def __init__(self, message: TextType) -> None:
- self.message = message
- def __rich__(self) -> TextType:
- return self.message
- class PromptBase(Generic[PromptType]):
- """Ask the user for input until a valid response is received. This is the base class, see one of
- the concrete classes for examples.
- Args:
- prompt (TextType, optional): Prompt text. Defaults to "".
- console (Console, optional): A Console instance or None to use global console. Defaults to None.
- password (bool, optional): Enable password input. Defaults to False.
- choices (List[str], optional): A list of valid choices. Defaults to None.
- show_default (bool, optional): Show default in prompt. Defaults to True.
- show_choices (bool, optional): Show choices in prompt. Defaults to True.
- """
- response_type: type = str
- validate_error_message = "[prompt.invalid]Please enter a valid value"
- illegal_choice_message = (
- "[prompt.invalid.choice]Please select one of the available options"
- )
- prompt_suffix = ": "
- choices: Optional[List[str]] = None
- def __init__(
- self,
- prompt: TextType = "",
- *,
- console: Optional[Console] = None,
- password: bool = False,
- choices: Optional[List[str]] = None,
- show_default: bool = True,
- show_choices: bool = True,
- ) -> None:
- self.console = console or get_console()
- self.prompt = (
- Text.from_markup(prompt, style="prompt")
- if isinstance(prompt, str)
- else prompt
- )
- self.password = password
- if choices is not None:
- self.choices = choices
- self.show_default = show_default
- self.show_choices = show_choices
- @classmethod
- @overload
- def ask(
- cls,
- prompt: TextType = "",
- *,
- console: Optional[Console] = None,
- password: bool = False,
- choices: Optional[List[str]] = None,
- show_default: bool = True,
- show_choices: bool = True,
- default: DefaultType,
- stream: Optional[TextIO] = None,
- ) -> Union[DefaultType, PromptType]:
- ...
- @classmethod
- @overload
- def ask(
- cls,
- prompt: TextType = "",
- *,
- console: Optional[Console] = None,
- password: bool = False,
- choices: Optional[List[str]] = None,
- show_default: bool = True,
- show_choices: bool = True,
- stream: Optional[TextIO] = None,
- ) -> PromptType:
- ...
- @classmethod
- def ask(
- cls,
- prompt: TextType = "",
- *,
- console: Optional[Console] = None,
- password: bool = False,
- choices: Optional[List[str]] = None,
- show_default: bool = True,
- show_choices: bool = True,
- default: Any = ...,
- stream: Optional[TextIO] = None,
- ) -> Any:
- """Shortcut to construct and run a prompt loop and return the result.
- Example:
- >>> filename = Prompt.ask("Enter a filename")
- Args:
- prompt (TextType, optional): Prompt text. Defaults to "".
- console (Console, optional): A Console instance or None to use global console. Defaults to None.
- password (bool, optional): Enable password input. Defaults to False.
- choices (List[str], optional): A list of valid choices. Defaults to None.
- show_default (bool, optional): Show default in prompt. Defaults to True.
- show_choices (bool, optional): Show choices in prompt. Defaults to True.
- stream (TextIO, optional): Optional text file open for reading to get input. Defaults to None.
- """
- _prompt = cls(
- prompt,
- console=console,
- password=password,
- choices=choices,
- show_default=show_default,
- show_choices=show_choices,
- )
- return _prompt(default=default, stream=stream)
- def render_default(self, default: DefaultType) -> Text:
- """Turn the supplied default in to a Text instance.
- Args:
- default (DefaultType): Default value.
- Returns:
- Text: Text containing rendering of default value.
- """
- return Text(f"({default})", "prompt.default")
- def make_prompt(self, default: DefaultType) -> Text:
- """Make prompt text.
- Args:
- default (DefaultType): Default value.
- Returns:
- Text: Text to display in prompt.
- """
- prompt = self.prompt.copy()
- prompt.end = ""
- if self.show_choices and self.choices:
- _choices = "/".join(self.choices)
- choices = f"[{_choices}]"
- prompt.append(" ")
- prompt.append(choices, "prompt.choices")
- if (
- default != ...
- and self.show_default
- and isinstance(default, (str, self.response_type))
- ):
- prompt.append(" ")
- _default = self.render_default(default)
- prompt.append(_default)
- prompt.append(self.prompt_suffix)
- return prompt
- @classmethod
- def get_input(
- cls,
- console: Console,
- prompt: TextType,
- password: bool,
- stream: Optional[TextIO] = None,
- ) -> str:
- """Get input from user.
- Args:
- console (Console): Console instance.
- prompt (TextType): Prompt text.
- password (bool): Enable password entry.
- Returns:
- str: String from user.
- """
- return console.input(prompt, password=password, stream=stream)
- def check_choice(self, value: str) -> bool:
- """Check value is in the list of valid choices.
- Args:
- value (str): Value entered by user.
- Returns:
- bool: True if choice was valid, otherwise False.
- """
- assert self.choices is not None
- return value.strip() in self.choices
- def process_response(self, value: str) -> PromptType:
- """Process response from user, convert to prompt type.
- Args:
- value (str): String typed by user.
- Raises:
- InvalidResponse: If ``value`` is invalid.
- Returns:
- PromptType: The value to be returned from ask method.
- """
- value = value.strip()
- try:
- return_value = self.response_type(value)
- except ValueError:
- raise InvalidResponse(self.validate_error_message)
- if self.choices is not None and not self.check_choice(value):
- raise InvalidResponse(self.illegal_choice_message)
- return return_value # type: ignore
- def on_validate_error(self, value: str, error: InvalidResponse) -> None:
- """Called to handle validation error.
- Args:
- value (str): String entered by user.
- error (InvalidResponse): Exception instance the initiated the error.
- """
- self.console.print(error)
- def pre_prompt(self) -> None:
- """Hook to display something before the prompt."""
- @overload
- def __call__(self, *, stream: Optional[TextIO] = None) -> PromptType:
- ...
- @overload
- def __call__(
- self, *, default: DefaultType, stream: Optional[TextIO] = None
- ) -> Union[PromptType, DefaultType]:
- ...
- def __call__(self, *, default: Any = ..., stream: Optional[TextIO] = None) -> Any:
- """Run the prompt loop.
- Args:
- default (Any, optional): Optional default value.
- Returns:
- PromptType: Processed value.
- """
- while True:
- self.pre_prompt()
- prompt = self.make_prompt(default)
- value = self.get_input(self.console, prompt, self.password, stream=stream)
- if value == "" and default != ...:
- return default
- try:
- return_value = self.process_response(value)
- except InvalidResponse as error:
- self.on_validate_error(value, error)
- continue
- else:
- return return_value
- class Prompt(PromptBase[str]):
- """A prompt that returns a str.
- Example:
- >>> name = Prompt.ask("Enter your name")
- """
- response_type = str
- class IntPrompt(PromptBase[int]):
- """A prompt that returns an integer.
- Example:
- >>> burrito_count = IntPrompt.ask("How many burritos do you want to order")
- """
- response_type = int
- validate_error_message = "[prompt.invalid]Please enter a valid integer number"
- class FloatPrompt(PromptBase[int]):
- """A prompt that returns a float.
- Example:
- >>> temperature = FloatPrompt.ask("Enter desired temperature")
- """
- response_type = float
- validate_error_message = "[prompt.invalid]Please enter a number"
- class Confirm(PromptBase[bool]):
- """A yes / no confirmation prompt.
- Example:
- >>> if Confirm.ask("Continue"):
- run_job()
- """
- response_type = bool
- validate_error_message = "[prompt.invalid]Please enter Y or N"
- choices: List[str] = ["y", "n"]
- def render_default(self, default: DefaultType) -> Text:
- """Render the default as (y) or (n) rather than True/False."""
- yes, no = self.choices
- return Text(f"({yes})" if default else f"({no})", style="prompt.default")
- def process_response(self, value: str) -> bool:
- """Convert choices to a bool."""
- value = value.strip().lower()
- if value not in self.choices:
- raise InvalidResponse(self.validate_error_message)
- return value == self.choices[0]
- if __name__ == "__main__": # pragma: no cover
- from pip._vendor.rich import print
- if Confirm.ask("Run [i]prompt[/i] tests?", default=True):
- while True:
- result = IntPrompt.ask(
- ":rocket: Enter a number between [b]1[/b] and [b]10[/b]", default=5
- )
- if result >= 1 and result <= 10:
- break
- print(":pile_of_poo: [prompt.invalid]Number must be between 1 and 10")
- print(f"number={result}")
- while True:
- password = Prompt.ask(
- "Please enter a password [cyan](must be at least 5 characters)",
- password=True,
- )
- if len(password) >= 5:
- break
- print("[prompt.invalid]password too short")
- print(f"password={password!r}")
- fruit = Prompt.ask("Enter a fruit", choices=["apple", "orange", "pear"])
- print(f"fruit={fruit!r}")
- else:
- print("[b]OK :loudly_crying_face:")
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