377 lines
11 KiB
Python
377 lines
11 KiB
Python
|
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: PromptType = 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
|
||
|
|
|
||
|
|
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:")
|