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"""Module contains the class to create a fuzzy prompt.""" |
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import asyncio |
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import math |
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from typing import ( |
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TYPE_CHECKING, |
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Any, |
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Callable, |
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Dict, |
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List, |
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Optional, |
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Tuple, |
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Union, |
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cast, |
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) |
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|
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from pfzy import fuzzy_match |
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from pfzy.score import fzy_scorer, substr_scorer |
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from pfzy.types import HAYSTACKS |
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from prompt_toolkit.application.application import Application |
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from prompt_toolkit.buffer import Buffer |
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from prompt_toolkit.filters.cli import IsDone |
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from prompt_toolkit.layout.containers import ( |
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ConditionalContainer, |
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FloatContainer, |
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HSplit, |
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Window, |
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) |
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from prompt_toolkit.layout.controls import BufferControl, DummyControl |
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from prompt_toolkit.layout.dimension import Dimension, LayoutDimension |
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from prompt_toolkit.layout.layout import Layout |
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from prompt_toolkit.layout.processors import AfterInput, BeforeInput |
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from prompt_toolkit.lexers.base import SimpleLexer |
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from prompt_toolkit.validation import ValidationError |
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from prompt_toolkit.widgets.base import Frame |
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|
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from InquirerPy.base import FakeDocument, InquirerPyUIListControl |
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from InquirerPy.base.list import BaseListPrompt |
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from InquirerPy.containers.instruction import InstructionWindow |
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from InquirerPy.containers.message import MessageWindow |
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from InquirerPy.containers.validation import ValidationFloat |
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from InquirerPy.enum import INQUIRERPY_POINTER_SEQUENCE |
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from InquirerPy.exceptions import InvalidArgument |
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from InquirerPy.separator import Separator |
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from InquirerPy.utils import ( |
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InquirerPyDefault, |
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InquirerPyKeybindings, |
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InquirerPyListChoices, |
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InquirerPyMessage, |
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InquirerPySessionResult, |
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InquirerPyStyle, |
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InquirerPyValidate, |
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calculate_height, |
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) |
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|
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if TYPE_CHECKING: |
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from prompt_toolkit.key_binding.key_processor import KeyPressEvent |
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|
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__all__ = ["FuzzyPrompt"] |
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|
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|
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class InquirerPyFuzzyControl(InquirerPyUIListControl): |
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"""An :class:`~prompt_toolkit.layout.UIControl` class that displays a list of choices. |
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|
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This only displays the chocies. The actual input buffer will be handled by a separate |
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:class:`~prompt_toolkit.layout.BufferControl`. |
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|
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Reference the parameter definition in :class:`.FuzzyPrompt`. |
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""" |
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|
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def __init__( |
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self, |
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choices: InquirerPyListChoices, |
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pointer: str, |
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marker: str, |
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current_text: Callable[[], str], |
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max_lines: int, |
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session_result: Optional[InquirerPySessionResult], |
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multiselect: bool, |
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marker_pl: str, |
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match_exact: bool, |
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) -> None: |
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self._pointer = pointer |
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self._marker = marker |
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self._marker_pl = marker_pl |
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self._current_text = current_text |
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self._max_lines = max_lines if max_lines > 0 else 1 |
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self._scorer = fzy_scorer if not match_exact else substr_scorer |
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super().__init__( |
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choices=choices, |
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default=None, |
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session_result=session_result, |
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multiselect=multiselect, |
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) |
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|
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def _format_choices(self) -> None: |
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for index, choice in enumerate(self.choices): |
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if isinstance(choice["value"], Separator): |
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raise InvalidArgument( |
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"fuzzy prompt argument choices should not contain Separator" |
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) |
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choice["index"] = index |
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choice["indices"] = [] |
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self._filtered_choices = self.choices |
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self._first_line = 0 |
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self._last_line = min(self._max_lines, self.choice_count) |
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self._height = self._last_line - self._first_line |
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|
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def _get_hover_text(self, choice) -> List[Tuple[str, str]]: |
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"""Get the current highlighted line of text. |
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|
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If in the middle of filtering, loop through the char and color |
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indices matched char into style class `class:fuzzy_match`. |
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|
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Returns: |
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FormattedText in list of tuple format. |
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""" |
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display_choices = [] |
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display_choices.append(("class:pointer", self._pointer)) |
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display_choices.append( |
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( |
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"class:marker", |
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self._marker |
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if self.choices[choice["index"]]["enabled"] |
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else self._marker_pl, |
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) |
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) |
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display_choices.append(("[SetCursorPosition]", "")) |
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if not choice["indices"]: |
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display_choices.append(("class:pointer", choice["name"])) |
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else: |
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indices = set(choice["indices"]) |
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for index, char in enumerate(choice["name"]): |
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if index in indices: |
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display_choices.append(("class:fuzzy_match", char)) |
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else: |
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display_choices.append(("class:pointer", char)) |
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return display_choices |
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|
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def _get_normal_text(self, choice) -> List[Tuple[str, str]]: |
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"""Get the line of text in `FormattedText`. |
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|
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If in the middle of filtering, loop through the char and color |
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indices matched char into `class:fuzzy_match`. |
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|
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Calculate spaces of pointer to make the choice equally align. |
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|
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Returns: |
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FormattedText in list of tuple format. |
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""" |
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display_choices = [] |
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display_choices.append(("class:pointer", len(self._pointer) * " ")) |
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display_choices.append( |
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( |
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"class:marker", |
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self._marker |
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if self.choices[choice["index"]]["enabled"] |
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else self._marker_pl, |
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) |
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) |
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if not choice["indices"]: |
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display_choices.append(("", choice["name"])) |
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else: |
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indices = set(choice["indices"]) |
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for index, char in enumerate(choice["name"]): |
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if index in indices: |
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display_choices.append(("class:fuzzy_match", char)) |
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else: |
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display_choices.append(("", char)) |
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return display_choices |
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|
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def _get_formatted_choices(self) -> List[Tuple[str, str]]: |
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"""Get all available choices in formatted text format. |
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|
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Overriding this method because `self.choice` will be the |
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full choice list. Using `self.filtered_choice` to get |
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a list of choice based on current_text. |
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|
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Returns: |
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FormattedText in list of tuple format. |
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""" |
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display_choices = [] |
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if self.choice_count == 0: |
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self._selected_choice_index = 0 |
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return display_choices |
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|
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if self._selected_choice_index < 0: |
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self._selected_choice_index = 0 |
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elif self._selected_choice_index >= self.choice_count: |
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self._selected_choice_index = self.choice_count - 1 |
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|
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if (self._last_line - self._first_line) < min(self.choice_count, self._height): |
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self._last_line = min(self.choice_count, self._height) |
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self._first_line = self._last_line - min(self.choice_count, self._height) |
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|
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if self._selected_choice_index <= self._first_line: |
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self._first_line = self._selected_choice_index |
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self._last_line = self._first_line + min(self._height, self.choice_count) |
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elif self._selected_choice_index >= self._last_line: |
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self._last_line = self._selected_choice_index + 1 |
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self._first_line = self._last_line - min(self._height, self.choice_count) |
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|
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if self._last_line > self.choice_count: |
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self._last_line = self.choice_count |
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self._first_line = self._last_line - min(self._height, self.choice_count) |
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if self._first_line < 0: |
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self._first_line = 0 |
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self._last_line = self._first_line + min(self._height, self.choice_count) |
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|
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for index in range(self._first_line, self._last_line): |
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if index == self.selected_choice_index: |
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display_choices += self._get_hover_text(self._filtered_choices[index]) |
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else: |
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display_choices += self._get_normal_text(self._filtered_choices[index]) |
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display_choices.append(("", "\n")) |
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if display_choices: |
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display_choices.pop() |
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return display_choices |
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|
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async def _filter_choices(self, wait_time: float) -> List[Dict[str, Any]]: |
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"""Call to filter choices using fzy fuzzy match. |
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|
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Args: |
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wait_time: Additional time to wait before filtering the choice. |
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|
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Returns: |
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Filtered choices. |
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""" |
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if not self._current_text(): |
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for choice in self.choices: |
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choice["indices"] = [] |
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choices = self.choices |
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else: |
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await asyncio.sleep(wait_time) |
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choices = await fuzzy_match( |
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self._current_text(), |
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cast(HAYSTACKS, self.choices), |
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key="name", |
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scorer=self._scorer, |
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) |
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return choices |
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|
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@property |
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def selection(self) -> Dict[str, Any]: |
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"""Override this value since `self.choice` does not indicate the choice displayed. |
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|
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`self.filtered_choice` is the up to date choice displayed. |
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|
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Returns: |
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A dictionary of name and value for the current pointed choice. |
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""" |
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return self._filtered_choices[self.selected_choice_index] |
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|
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@property |
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def choice_count(self) -> int: |
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"""int: Filtered choice count.""" |
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return len(self._filtered_choices) |
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|
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class FuzzyPrompt(BaseListPrompt): |
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"""Create a prompt that lists choices while also allowing fuzzy search like fzf. |
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A wrapper class around :class:`~prompt_toolkit.application.Application`. |
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Fuzzy search using :func:`pfzy.match.fuzzy_match` function. |
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|
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Override the default keybindings for up/down as j/k cannot be bind even if `editing_mode` is vim |
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due to the input buffer. |
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|
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Args: |
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message: The question to ask the user. |
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Refer to :ref:`pages/dynamic:message` documentation for more details. |
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choices: List of choices to display and select. |
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Refer to :ref:`pages/dynamic:choices` documentation for more details. |
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style: An :class:`InquirerPyStyle` instance. |
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Refer to :ref:`Style <pages/style:Alternate Syntax>` documentation for more details. |
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vi_mode: Use vim keybinding for the prompt. |
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Refer to :ref:`pages/kb:Keybindings` documentation for more details. |
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default: Set the default value in the search buffer. |
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Different than other list type prompts, the `default` parameter tries to replicate what fzf does and |
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add the value in `default` to search buffer so it starts searching immediatelly. |
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Refer to :ref:`pages/dynamic:default` documentation for more details. |
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qmark: Question mark symbol. Custom symbol that will be displayed infront of the question before its answered. |
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amark: Answer mark symbol. Custom symbol that will be displayed infront of the question after its answered. |
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pointer: Pointer symbol. Customer symbol that will be used to indicate the current choice selection. |
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instruction: Short instruction to display next to the question. |
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long_instruction: Long instructions to display at the bottom of the prompt. |
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validate: Add validation to user input. |
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The main use case for this prompt would be when `multiselect` is True, you can enforce a min/max selection. |
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Refer to :ref:`pages/validator:Validator` documentation for more details. |
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invalid_message: Error message to display when user input is invalid. |
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Refer to :ref:`pages/validator:Validator` documentation for more details. |
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transformer: A function which performs additional transformation on the value that gets printed to the terminal. |
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Different than `filter` parameter, this is only visual effect and won’t affect the actual value returned by :meth:`~InquirerPy.base.simple.BaseSimplePrompt.execute`. |
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Refer to :ref:`pages/dynamic:transformer` documentation for more details. |
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filter: A function which performs additional transformation on the result. |
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This affects the actual value returned by :meth:`~InquirerPy.base.simple.BaseSimplePrompt.execute`. |
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Refer to :ref:`pages/dynamic:filter` documentation for more details. |
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height: Preferred height of the prompt. |
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Refer to :ref:`pages/height:Height` documentation for more details. |
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max_height: Max height of the prompt. |
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Refer to :ref:`pages/height:Height` documentation for more details. |
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multiselect: Enable multi-selection on choices. |
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You can use `validate` parameter to control min/max selections. |
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Setting to True will also change the result from a single value to a list of values. |
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prompt: Input prompt symbol. Custom symbol to display infront of the input buffer to indicate for input. |
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border: Create border around the choice window. |
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info: Display choice information similar to fzf --info=inline next to the prompt. |
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match_exact: Use exact sub-string match instead of using fzy fuzzy match algorithm. |
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exact_symbol: Custom symbol to display in the info section when `info=True`. |
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marker: Marker Symbol. Custom symbol to indicate if a choice is selected. |
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This will take effects when `multiselect` is True. |
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marker_pl: Marker place holder when the choice is not selected. |
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This is empty space by default. |
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keybindings: Customise the builtin keybindings. |
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Refer to :ref:`pages/kb:Keybindings` for more details. |
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cycle: Return to top item if hit bottom during navigation or vice versa. |
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wrap_lines: Soft wrap question lines when question exceeds the terminal width. |
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raise_keyboard_interrupt: Raise the :class:`KeyboardInterrupt` exception when `ctrl-c` is pressed. If false, the result |
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will be `None` and the question is skiped. |
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mandatory: Indicate if the prompt is mandatory. If True, then the question cannot be skipped. |
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mandatory_message: Error message to show when user attempts to skip mandatory prompt. |
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session_result: Used internally for :ref:`index:Classic Syntax (PyInquirer)`. |
|
|
|
Examples: |
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>>> from InquirerPy import inquirer |
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>>> result = inquirer.fuzzy(message="Select one:", choices=[1, 2, 3]).execute() |
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>>> print(result) |
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1 |
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""" |
|
|
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def __init__( |
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self, |
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message: InquirerPyMessage, |
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choices: InquirerPyListChoices, |
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default: InquirerPyDefault = "", |
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pointer: str = INQUIRERPY_POINTER_SEQUENCE, |
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style: Optional[InquirerPyStyle] = None, |
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vi_mode: bool = False, |
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qmark: str = "?", |
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amark: str = "?", |
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transformer: Optional[Callable[[Any], Any]] = None, |
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filter: Optional[Callable[[Any], Any]] = None, |
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instruction: str = "", |
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long_instruction: str = "", |
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multiselect: bool = False, |
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prompt: str = INQUIRERPY_POINTER_SEQUENCE, |
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marker: str = INQUIRERPY_POINTER_SEQUENCE, |
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marker_pl: str = " ", |
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border: bool = False, |
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info: bool = True, |
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match_exact: bool = False, |
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exact_symbol: str = " E", |
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height: Optional[Union[str, int]] = None, |
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max_height: Optional[Union[str, int]] = None, |
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validate: Optional[InquirerPyValidate] = None, |
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invalid_message: str = "Invalid input", |
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keybindings: Optional[InquirerPyKeybindings] = None, |
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cycle: bool = True, |
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wrap_lines: bool = True, |
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raise_keyboard_interrupt: bool = True, |
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mandatory: bool = True, |
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mandatory_message: str = "Mandatory prompt", |
|
session_result: Optional[InquirerPySessionResult] = None, |
|
) -> None: |
|
if not keybindings: |
|
keybindings = {} |
|
self._prompt = prompt |
|
self._info = info |
|
self._task = None |
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self._rendered = False |
|
self._exact_symbol = exact_symbol |
|
|
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keybindings = { |
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"up": [{"key": "up"}, {"key": "c-p"}], |
|
"down": [{"key": "down"}, {"key": "c-n"}], |
|
"toggle": [], |
|
"toggle-exact": [], |
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**keybindings, |
|
} |
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super().__init__( |
|
message=message, |
|
style=style, |
|
border=border, |
|
vi_mode=vi_mode, |
|
qmark=qmark, |
|
amark=amark, |
|
transformer=transformer, |
|
filter=filter, |
|
validate=validate, |
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invalid_message=invalid_message, |
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multiselect=multiselect, |
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instruction=instruction, |
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long_instruction=long_instruction, |
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keybindings=keybindings, |
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cycle=cycle, |
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wrap_lines=wrap_lines, |
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raise_keyboard_interrupt=raise_keyboard_interrupt, |
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mandatory=mandatory, |
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mandatory_message=mandatory_message, |
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session_result=session_result, |
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) |
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self.kb_func_lookup = {"toggle-exact": [{"func": self._toggle_exact}]} |
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self._default = ( |
|
default |
|
if not isinstance(default, Callable) |
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else cast(Callable, default)(self._result) |
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) |
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self._height_offset += 1 |
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self._dimmension_height, self._dimmension_max_height = calculate_height( |
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height, max_height, height_offset=self.height_offset |
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) |
|
|
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self._content_control: InquirerPyFuzzyControl = InquirerPyFuzzyControl( |
|
choices=choices, |
|
pointer=pointer, |
|
marker=marker, |
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current_text=self._get_current_text, |
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max_lines=self._dimmension_max_height, |
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session_result=session_result, |
|
multiselect=multiselect, |
|
marker_pl=marker_pl, |
|
match_exact=match_exact, |
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) |
|
|
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self._buffer = Buffer(on_text_changed=self._on_text_changed) |
|
input_window = Window( |
|
height=LayoutDimension.exact(1), |
|
content=BufferControl( |
|
self._buffer, |
|
[ |
|
AfterInput(self._generate_after_input), |
|
BeforeInput(self._generate_before_input), |
|
], |
|
lexer=SimpleLexer("class:input"), |
|
), |
|
) |
|
|
|
choice_height_dimmension = lambda: Dimension( |
|
max=self._dimmension_max_height, |
|
preferred=self._dimmension_height, |
|
min=self.content_control._height if self.content_control._height > 0 else 1, |
|
) |
|
self.choice_window = Window( |
|
content=self.content_control, |
|
height=choice_height_dimmension, |
|
dont_extend_height=True, |
|
) |
|
|
|
main_content_window = HSplit([input_window, self.choice_window]) |
|
if self._border: |
|
main_content_window = Frame(main_content_window) |
|
self._layout = Layout( |
|
FloatContainer( |
|
content=HSplit( |
|
[ |
|
MessageWindow( |
|
message=self._get_prompt_message, |
|
filter=True, |
|
wrap_lines=self._wrap_lines, |
|
show_cursor=True, |
|
), |
|
ConditionalContainer( |
|
main_content_window, |
|
filter=~IsDone(), |
|
), |
|
ConditionalContainer( |
|
Window(content=DummyControl()), |
|
filter=~IsDone() & self._is_displaying_long_instruction, |
|
), |
|
InstructionWindow( |
|
message=self._long_instruction, |
|
filter=~IsDone() & self._is_displaying_long_instruction, |
|
wrap_lines=self._wrap_lines, |
|
), |
|
], |
|
), |
|
floats=[ |
|
ValidationFloat( |
|
invalid_message=self._get_error_message, |
|
filter=self._is_invalid & ~IsDone(), |
|
wrap_lines=self._wrap_lines, |
|
left=0, |
|
bottom=self._validation_window_bottom_offset, |
|
), |
|
], |
|
) |
|
) |
|
self._layout.focus(input_window) |
|
|
|
self._application = Application( |
|
layout=self._layout, |
|
style=self._style, |
|
key_bindings=self._kb, |
|
editing_mode=self._editing_mode, |
|
after_render=self._after_render, |
|
) |
|
|
|
def _toggle_exact(self, _, value: Optional[bool] = None) -> None: |
|
"""Toggle matching algorithm. |
|
|
|
Switch between fzy fuzzy match or sub-string exact match. |
|
|
|
Args: |
|
value: Specify the value to toggle. |
|
""" |
|
if value is not None: |
|
self.content_control._scorer = fzy_scorer if not value else substr_scorer |
|
else: |
|
self.content_control._scorer = ( |
|
fzy_scorer |
|
if self.content_control._scorer == substr_scorer |
|
else substr_scorer |
|
) |
|
|
|
def _on_rendered(self, _) -> None: |
|
"""Render callable choices and set the buffer default text. |
|
|
|
Setting buffer default text has to be after application is rendered and choice are loaded, |
|
because `self._filter_choices` will use the event loop from `Application`. |
|
""" |
|
if self._default: |
|
default_text = str(self._default) |
|
self._buffer.text = default_text |
|
self._buffer.cursor_position = len(default_text) |
|
|
|
def _handle_toggle_all(self, _, value: Optional[bool] = None) -> None: |
|
"""Toggle all choice `enabled` status. |
|
|
|
Args: |
|
value: Specify the value to toggle. |
|
""" |
|
if not self._multiselect: |
|
return |
|
for choice in self.content_control._filtered_choices: |
|
raw_choice = self.content_control.choices[choice["index"]] |
|
if isinstance(raw_choice["value"], Separator): |
|
continue |
|
raw_choice["enabled"] = value if value else not raw_choice["enabled"] |
|
|
|
def _generate_after_input(self) -> List[Tuple[str, str]]: |
|
"""Virtual text displayed after the user input.""" |
|
display_message = [] |
|
if self._info: |
|
display_message.append(("", " ")) |
|
display_message.append( |
|
( |
|
"class:fuzzy_info", |
|
f"{self.content_control.choice_count}/{len(self.content_control.choices)}", |
|
) |
|
) |
|
if self._multiselect: |
|
display_message.append( |
|
("class:fuzzy_info", f" ({len(self.selected_choices)})") |
|
) |
|
if self.content_control._scorer == substr_scorer: |
|
display_message.append(("class:fuzzy_info", self._exact_symbol)) |
|
return display_message |
|
|
|
def _generate_before_input(self) -> List[Tuple[str, str]]: |
|
"""Display prompt symbol as virtual text before user input.""" |
|
display_message = [] |
|
display_message.append(("class:fuzzy_prompt", "%s " % self._prompt)) |
|
return display_message |
|
|
|
def _filter_callback(self, task): |
|
"""Redraw `self._application` when the filter task is finished.""" |
|
if task.cancelled(): |
|
return |
|
self.content_control._filtered_choices = task.result() |
|
self._application.invalidate() |
|
|
|
def _calculate_wait_time(self) -> float: |
|
"""Calculate wait time to smoother the application on big data set. |
|
|
|
Using digit of the choices lengeth to get wait time. |
|
For digit greater than 6, using formula 2^(digit - 5) * 0.3 to increase the wait_time. |
|
|
|
Returns: |
|
Desired wait time before running the filter. |
|
""" |
|
wait_table = { |
|
2: 0.05, |
|
3: 0.1, |
|
4: 0.2, |
|
5: 0.3, |
|
} |
|
digit = 1 |
|
if len(self.content_control.choices) > 0: |
|
digit = int(math.log10(len(self.content_control.choices))) + 1 |
|
|
|
if digit < 2: |
|
return 0.0 |
|
if digit in wait_table: |
|
return wait_table[digit] |
|
return wait_table[5] * (2 ** (digit - 5)) |
|
|
|
def _on_text_changed(self, _) -> None: |
|
"""Handle buffer text change event. |
|
|
|
1. Check if there is current task running. |
|
2. Cancel if already has task, increase wait_time |
|
3. Create a filtered_choice task in asyncio event loop |
|
4. Add callback |
|
|
|
1. Run a new filter on all choices. |
|
2. Re-calculate current selected_choice_index |
|
if it exceeds the total filtered_choice. |
|
3. Avoid selected_choice_index less than zero, |
|
this fix the issue of cursor lose when: |
|
choice -> empty choice -> choice |
|
|
|
Don't need to create or check asyncio event loop, `prompt_toolkit` |
|
application already has a event loop running. |
|
""" |
|
if self._invalid: |
|
self._invalid = False |
|
wait_time = self._calculate_wait_time() |
|
if self._task and not self._task.done(): |
|
self._task.cancel() |
|
self._task = asyncio.create_task( |
|
self.content_control._filter_choices(wait_time) |
|
) |
|
self._task.add_done_callback(self._filter_callback) |
|
|
|
def _handle_toggle_choice(self, _) -> None: |
|
"""Handle tab event, alter the `selected` state of the choice.""" |
|
if not self._multiselect: |
|
return |
|
current_selected_index = self.content_control.selection["index"] |
|
self.content_control.choices[current_selected_index][ |
|
"enabled" |
|
] = not self.content_control.choices[current_selected_index]["enabled"] |
|
|
|
def _handle_enter(self, event: "KeyPressEvent") -> None: |
|
"""Handle enter event. |
|
|
|
Validate the result first. |
|
|
|
In multiselect scenario, if no TAB is entered, then capture the current |
|
highlighted choice and return the value in a list. |
|
Otherwise, return all TAB choices as a list. |
|
|
|
In normal scenario, reutrn the current highlighted choice. |
|
|
|
If current UI contains no choice due to filter, return None. |
|
""" |
|
try: |
|
fake_document = FakeDocument(self.result_value) |
|
self._validator.validate(fake_document) |
|
if self._multiselect: |
|
self.status["answered"] = True |
|
if not self.selected_choices: |
|
self.status["result"] = [self.content_control.selection["name"]] |
|
event.app.exit(result=[self.content_control.selection["value"]]) |
|
else: |
|
self.status["result"] = self.result_name |
|
event.app.exit(result=self.result_value) |
|
else: |
|
self.status["answered"] = True |
|
self.status["result"] = self.content_control.selection["name"] |
|
event.app.exit(result=self.content_control.selection["value"]) |
|
except ValidationError as e: |
|
self._set_error(str(e)) |
|
except IndexError: |
|
self.status["answered"] = True |
|
self.status["result"] = None if not self._multiselect else [] |
|
event.app.exit(result=None if not self._multiselect else []) |
|
|
|
@property |
|
def content_control(self) -> InquirerPyFuzzyControl: |
|
"""InquirerPyFuzzyControl: Override for type-hinting.""" |
|
return cast(InquirerPyFuzzyControl, super().content_control) |
|
|
|
@content_control.setter |
|
def content_control(self, value: InquirerPyFuzzyControl) -> None: |
|
self._content_control = value |
|
|
|
def _get_current_text(self) -> str: |
|
"""Get current input buffer text.""" |
|
return self._buffer.text |
|
|