337 lines
10 KiB
Python
337 lines
10 KiB
Python
from __future__ import annotations
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from typing import TYPE_CHECKING
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from prompt_toolkit.application import get_app
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from prompt_toolkit.buffer import Buffer
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from prompt_toolkit.document import Document
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from prompt_toolkit.enums import DEFAULT_BUFFER
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from prompt_toolkit.filters import (
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Condition,
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emacs_insert_mode,
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emacs_mode,
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has_focus,
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has_selection,
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vi_insert_mode,
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)
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from prompt_toolkit.key_binding import KeyBindings
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from prompt_toolkit.key_binding.bindings.named_commands import get_by_name
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from prompt_toolkit.key_binding.key_processor import KeyPressEvent
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from prompt_toolkit.keys import Keys
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from .utils import document_is_multiline_python
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if TYPE_CHECKING:
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from .python_input import PythonInput
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__all__ = [
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"load_python_bindings",
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"load_sidebar_bindings",
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"load_confirm_exit_bindings",
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]
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E = KeyPressEvent
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@Condition
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def tab_should_insert_whitespace() -> bool:
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"""
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When the 'tab' key is pressed with only whitespace character before the
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cursor, do autocompletion. Otherwise, insert indentation.
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Except for the first character at the first line. Then always do a
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completion. It doesn't make sense to start the first line with
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indentation.
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"""
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b = get_app().current_buffer
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before_cursor = b.document.current_line_before_cursor
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return bool(b.text and (not before_cursor or before_cursor.isspace()))
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def load_python_bindings(python_input: PythonInput) -> KeyBindings:
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"""
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Custom key bindings.
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"""
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bindings = KeyBindings()
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sidebar_visible = Condition(lambda: python_input.show_sidebar)
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handle = bindings.add
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@handle("c-l")
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def _(event: E) -> None:
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"""
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Clear whole screen and render again -- also when the sidebar is visible.
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"""
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event.app.renderer.clear()
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@handle("c-z")
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def _(event: E) -> None:
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"""
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Suspend.
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"""
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if python_input.enable_system_bindings:
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event.app.suspend_to_background()
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# Delete word before cursor, but use all Python symbols as separators
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# (WORD=False).
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handle("c-w")(get_by_name("backward-kill-word"))
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@handle("f2")
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def _(event: E) -> None:
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"""
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Show/hide sidebar.
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"""
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python_input.show_sidebar = not python_input.show_sidebar
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if python_input.show_sidebar:
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event.app.layout.focus(python_input.ptpython_layout.sidebar)
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else:
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event.app.layout.focus_last()
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@handle("f3")
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def _(event: E) -> None:
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"""
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Select from the history.
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"""
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python_input.enter_history()
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@handle("f4")
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def _(event: E) -> None:
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"""
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Toggle between Vi and Emacs mode.
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"""
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python_input.vi_mode = not python_input.vi_mode
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@handle("f6")
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def _(event: E) -> None:
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"""
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Enable/Disable paste mode.
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"""
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python_input.paste_mode = not python_input.paste_mode
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@handle(
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"tab", filter=~sidebar_visible & ~has_selection & tab_should_insert_whitespace
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)
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def _(event: E) -> None:
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"""
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When tab should insert whitespace, do that instead of completion.
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"""
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event.app.current_buffer.insert_text(" ")
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@Condition
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def is_multiline() -> bool:
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return document_is_multiline_python(python_input.default_buffer.document)
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@handle(
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"enter",
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filter=~sidebar_visible
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& ~has_selection
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& (vi_insert_mode | emacs_insert_mode)
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& has_focus(DEFAULT_BUFFER)
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& ~is_multiline,
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)
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@handle(Keys.Escape, Keys.Enter, filter=~sidebar_visible & emacs_mode)
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def _(event: E) -> None:
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"""
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Accept input (for single line input).
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"""
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b = event.current_buffer
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if b.validate():
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# When the cursor is at the end, and we have an empty line:
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# drop the empty lines, but return the value.
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b.document = Document(
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text=b.text.rstrip(), cursor_position=len(b.text.rstrip())
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)
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b.validate_and_handle()
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@handle(
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"enter",
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filter=~sidebar_visible
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& ~has_selection
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& (vi_insert_mode | emacs_insert_mode)
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& has_focus(DEFAULT_BUFFER)
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& is_multiline,
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)
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def _(event: E) -> None:
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"""
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Behaviour of the Enter key.
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Auto indent after newline/Enter.
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(When not in Vi navigation mode, and when multiline is enabled.)
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"""
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b = event.current_buffer
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empty_lines_required = python_input.accept_input_on_enter or 10000
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def at_the_end(b: Buffer) -> bool:
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"""we consider the cursor at the end when there is no text after
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the cursor, or only whitespace."""
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text = b.document.text_after_cursor
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return text == "" or (text.isspace() and "\n" not in text)
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if python_input.paste_mode:
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# In paste mode, always insert text.
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b.insert_text("\n")
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elif at_the_end(b) and b.document.text.replace(" ", "").endswith(
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"\n" * (empty_lines_required - 1)
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):
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# When the cursor is at the end, and we have an empty line:
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# drop the empty lines, but return the value.
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if b.validate():
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b.document = Document(
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text=b.text.rstrip(), cursor_position=len(b.text.rstrip())
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)
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b.validate_and_handle()
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else:
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auto_newline(b)
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@handle(
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"c-d",
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filter=~sidebar_visible
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& has_focus(python_input.default_buffer)
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& Condition(
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lambda:
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# The current buffer is empty.
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not get_app().current_buffer.text
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),
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)
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def _(event: E) -> None:
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"""
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Override Control-D exit, to ask for confirmation.
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"""
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if python_input.confirm_exit:
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# Show exit confirmation and focus it (focusing is important for
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# making sure the default buffer key bindings are not active).
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python_input.show_exit_confirmation = True
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python_input.app.layout.focus(
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python_input.ptpython_layout.exit_confirmation
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)
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else:
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event.app.exit(exception=EOFError)
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@handle("c-c", filter=has_focus(python_input.default_buffer))
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def _(event: E) -> None:
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"Abort when Control-C has been pressed."
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event.app.exit(exception=KeyboardInterrupt, style="class:aborting")
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return bindings
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def load_sidebar_bindings(python_input: PythonInput) -> KeyBindings:
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"""
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Load bindings for the navigation in the sidebar.
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"""
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bindings = KeyBindings()
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handle = bindings.add
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sidebar_visible = Condition(lambda: python_input.show_sidebar)
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@handle("up", filter=sidebar_visible)
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@handle("c-p", filter=sidebar_visible)
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@handle("k", filter=sidebar_visible)
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def _(event: E) -> None:
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"Go to previous option."
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python_input.selected_option_index = (
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python_input.selected_option_index - 1
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) % python_input.option_count
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@handle("down", filter=sidebar_visible)
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@handle("c-n", filter=sidebar_visible)
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@handle("j", filter=sidebar_visible)
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def _(event: E) -> None:
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"Go to next option."
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python_input.selected_option_index = (
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python_input.selected_option_index + 1
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) % python_input.option_count
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@handle("right", filter=sidebar_visible)
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@handle("l", filter=sidebar_visible)
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@handle(" ", filter=sidebar_visible)
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def _(event: E) -> None:
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"Select next value for current option."
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option = python_input.selected_option
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option.activate_next()
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@handle("left", filter=sidebar_visible)
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@handle("h", filter=sidebar_visible)
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def _(event: E) -> None:
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"Select previous value for current option."
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option = python_input.selected_option
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option.activate_previous()
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@handle("c-c", filter=sidebar_visible)
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@handle("c-d", filter=sidebar_visible)
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@handle("c-d", filter=sidebar_visible)
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@handle("enter", filter=sidebar_visible)
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@handle("escape", filter=sidebar_visible)
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def _(event: E) -> None:
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"Hide sidebar."
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python_input.show_sidebar = False
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event.app.layout.focus_last()
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return bindings
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def load_confirm_exit_bindings(python_input: PythonInput) -> KeyBindings:
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"""
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Handle yes/no key presses when the exit confirmation is shown.
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"""
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bindings = KeyBindings()
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handle = bindings.add
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confirmation_visible = Condition(lambda: python_input.show_exit_confirmation)
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@handle("y", filter=confirmation_visible)
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@handle("Y", filter=confirmation_visible)
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@handle("enter", filter=confirmation_visible)
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@handle("c-d", filter=confirmation_visible)
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def _(event: E) -> None:
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"""
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Really quit.
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"""
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event.app.exit(exception=EOFError, style="class:exiting")
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@handle(Keys.Any, filter=confirmation_visible)
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def _(event: E) -> None:
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"""
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Cancel exit.
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"""
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python_input.show_exit_confirmation = False
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python_input.app.layout.focus_previous()
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return bindings
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def auto_newline(buffer: Buffer) -> None:
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r"""
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Insert \n at the cursor position. Also add necessary padding.
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"""
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insert_text = buffer.insert_text
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if buffer.document.current_line_after_cursor:
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# When we are in the middle of a line. Always insert a newline.
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insert_text("\n")
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else:
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# Go to new line, but also add indentation.
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current_line = buffer.document.current_line_before_cursor.rstrip()
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insert_text("\n")
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# Unident if the last line ends with 'pass', remove four spaces.
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unindent = current_line.rstrip().endswith(" pass")
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# Copy whitespace from current line
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current_line2 = current_line[4:] if unindent else current_line
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for c in current_line2:
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if c.isspace():
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insert_text(c)
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else:
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break
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# If the last line ends with a colon, add four extra spaces.
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if current_line[-1:] == ":":
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for x in range(4):
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insert_text(" ")
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