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from abc import ABC, abstractmethod
from enum import Enum
from typing import TYPE_CHECKING, Any, Callable, Union
from prompt_toolkit.enums import EditingMode
from prompt_toolkit.key_binding.vi_state import InputMode
if TYPE_CHECKING:
from .application import Application
__all__ = [
"CursorShape",
"CursorShapeConfig",
"SimpleCursorShapeConfig",
"ModalCursorShapeConfig",
"DynamicCursorShapeConfig",
"to_cursor_shape_config",
]
class CursorShape(Enum):
# Default value that should tell the output implementation to never send
# cursor shape escape sequences. This is the default right now, because
# before this `CursorShape` functionality was introduced into
# prompt_toolkit itself, people had workarounds to send cursor shapes
# escapes into the terminal, by monkey patching some of prompt_toolkit's
# internals. We don't want the default prompt_toolkit implemetation to
# interfere with that. E.g., IPython patches the `ViState.input_mode`
# property. See: https://github.com/ipython/ipython/pull/13501/files
_NEVER_CHANGE = "_NEVER_CHANGE"
BLOCK = "BLOCK"
BEAM = "BEAM"
UNDERLINE = "UNDERLINE"
BLINKING_BLOCK = "BLINKING_BLOCK"
BLINKING_BEAM = "BLINKING_BEAM"
BLINKING_UNDERLINE = "BLINKING_UNDERLINE"
class CursorShapeConfig(ABC):
@abstractmethod
def get_cursor_shape(self, application: "Application[Any]") -> CursorShape:
"""
Return the cursor shape to be used in the current state.
"""
AnyCursorShapeConfig = Union[CursorShape, CursorShapeConfig, None]
class SimpleCursorShapeConfig(CursorShapeConfig):
"""
Always show the given cursor shape.
"""
def __init__(self, cursor_shape: CursorShape = CursorShape._NEVER_CHANGE) -> None:
self.cursor_shape = cursor_shape
def get_cursor_shape(self, application: "Application[Any]") -> CursorShape:
return self.cursor_shape
class ModalCursorShapeConfig(CursorShapeConfig):
"""
Show cursor shape according to the current input mode.
"""
def get_cursor_shape(self, application: "Application[Any]") -> CursorShape:
if application.editing_mode == EditingMode.VI:
if application.vi_state.input_mode == InputMode.INSERT:
return CursorShape.BEAM
if application.vi_state.input_mode == InputMode.REPLACE:
return CursorShape.UNDERLINE
# Default
return CursorShape.BLOCK
class DynamicCursorShapeConfig(CursorShapeConfig):
def __init__(
self, get_cursor_shape_config: Callable[[], AnyCursorShapeConfig]
) -> None:
self.get_cursor_shape_config = get_cursor_shape_config
def get_cursor_shape(self, application: "Application[Any]") -> CursorShape:
return to_cursor_shape_config(self.get_cursor_shape_config()).get_cursor_shape(
application
)
def to_cursor_shape_config(value: AnyCursorShapeConfig) -> CursorShapeConfig:
"""
Take a `CursorShape` instance or `CursorShapeConfig` and turn it into a
`CursorShapeConfig`.
"""
if value is None:
return SimpleCursorShapeConfig()
if isinstance(value, CursorShape):
return SimpleCursorShapeConfig(value)
return value
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