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