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Mini Shell
Mini Shell
import sys
import time
from typing import TYPE_CHECKING, Callable, Dict, Iterable, List, Union
if sys.version_info >= (3, 8):
from typing import Final
else:
from typing_extensions import Final # pragma: no cover
from .segment import ControlCode, ControlType, Segment
if TYPE_CHECKING:
from .console import Console, ConsoleOptions, RenderResult
STRIP_CONTROL_CODES: Final = [
7, # Bell
8, # Backspace
11, # Vertical tab
12, # Form feed
13, # Carriage return
]
_CONTROL_STRIP_TRANSLATE: Final = {
_codepoint: None for _codepoint in STRIP_CONTROL_CODES
}
CONTROL_ESCAPE: Final = {
7: "\\a",
8: "\\b",
11: "\\v",
12: "\\f",
13: "\\r",
}
CONTROL_CODES_FORMAT: Dict[int, Callable[..., str]] = {
ControlType.BELL: lambda: "\x07",
ControlType.CARRIAGE_RETURN: lambda: "\r",
ControlType.HOME: lambda: "\x1b[H",
ControlType.CLEAR: lambda: "\x1b[2J",
ControlType.ENABLE_ALT_SCREEN: lambda: "\x1b[?1049h",
ControlType.DISABLE_ALT_SCREEN: lambda: "\x1b[?1049l",
ControlType.SHOW_CURSOR: lambda: "\x1b[?25h",
ControlType.HIDE_CURSOR: lambda: "\x1b[?25l",
ControlType.CURSOR_UP: lambda param: f"\x1b[{param}A",
ControlType.CURSOR_DOWN: lambda param: f"\x1b[{param}B",
ControlType.CURSOR_FORWARD: lambda param: f"\x1b[{param}C",
ControlType.CURSOR_BACKWARD: lambda param: f"\x1b[{param}D",
ControlType.CURSOR_MOVE_TO_COLUMN: lambda param: f"\x1b[{param+1}G",
ControlType.ERASE_IN_LINE: lambda param: f"\x1b[{param}K",
ControlType.CURSOR_MOVE_TO: lambda x, y: f"\x1b[{y+1};{x+1}H",
ControlType.SET_WINDOW_TITLE: lambda title: f"\x1b]0;{title}\x07",
}
class Control:
"""A renderable that inserts a control code (non printable but may move cursor).
Args:
*codes (str): Positional arguments are either a :class:`~rich.segment.ControlType` enum or a
tuple of ControlType and an integer parameter
"""
__slots__ = ["segment"]
def __init__(self, *codes: Union[ControlType, ControlCode]) -> None:
control_codes: List[ControlCode] = [
(code,) if isinstance(code, ControlType) else code for code in codes
]
_format_map = CONTROL_CODES_FORMAT
rendered_codes = "".join(
_format_map[code](*parameters) for code, *parameters in control_codes
)
self.segment = Segment(rendered_codes, None, control_codes)
@classmethod
def bell(cls) -> "Control":
"""Ring the 'bell'."""
return cls(ControlType.BELL)
@classmethod
def home(cls) -> "Control":
"""Move cursor to 'home' position."""
return cls(ControlType.HOME)
@classmethod
def move(cls, x: int = 0, y: int = 0) -> "Control":
"""Move cursor relative to current position.
Args:
x (int): X offset.
y (int): Y offset.
Returns:
~Control: Control object.
"""
def get_codes() -> Iterable[ControlCode]:
control = ControlType
if x:
yield (
control.CURSOR_FORWARD if x > 0 else control.CURSOR_BACKWARD,
abs(x),
)
if y:
yield (
control.CURSOR_DOWN if y > 0 else control.CURSOR_UP,
abs(y),
)
control = cls(*get_codes())
return control
@classmethod
def move_to_column(cls, x: int, y: int = 0) -> "Control":
"""Move to the given column, optionally add offset to row.
Returns:
x (int): absolute x (column)
y (int): optional y offset (row)
Returns:
~Control: Control object.
"""
return (
cls(
(ControlType.CURSOR_MOVE_TO_COLUMN, x),
(
ControlType.CURSOR_DOWN if y > 0 else ControlType.CURSOR_UP,
abs(y),
),
)
if y
else cls((ControlType.CURSOR_MOVE_TO_COLUMN, x))
)
@classmethod
def move_to(cls, x: int, y: int) -> "Control":
"""Move cursor to absolute position.
Args:
x (int): x offset (column)
y (int): y offset (row)
Returns:
~Control: Control object.
"""
return cls((ControlType.CURSOR_MOVE_TO, x, y))
@classmethod
def clear(cls) -> "Control":
"""Clear the screen."""
return cls(ControlType.CLEAR)
@classmethod
def show_cursor(cls, show: bool) -> "Control":
"""Show or hide the cursor."""
return cls(ControlType.SHOW_CURSOR if show else ControlType.HIDE_CURSOR)
@classmethod
def alt_screen(cls, enable: bool) -> "Control":
"""Enable or disable alt screen."""
if enable:
return cls(ControlType.ENABLE_ALT_SCREEN, ControlType.HOME)
else:
return cls(ControlType.DISABLE_ALT_SCREEN)
@classmethod
def title(cls, title: str) -> "Control":
"""Set the terminal window title
Args:
title (str): The new terminal window title
"""
return cls((ControlType.SET_WINDOW_TITLE, title))
def __str__(self) -> str:
return self.segment.text
def __rich_console__(
self, console: "Console", options: "ConsoleOptions"
) -> "RenderResult":
if self.segment.text:
yield self.segment
def strip_control_codes(
text: str, _translate_table: Dict[int, None] = _CONTROL_STRIP_TRANSLATE
) -> str:
"""Remove control codes from text.
Args:
text (str): A string possibly contain control codes.
Returns:
str: String with control codes removed.
"""
return text.translate(_translate_table)
def escape_control_codes(
text: str,
_translate_table: Dict[int, str] = CONTROL_ESCAPE,
) -> str:
"""Replace control codes with their "escaped" equivalent in the given text.
(e.g. "\b" becomes "\\b")
Args:
text (str): A string possibly containing control codes.
Returns:
str: String with control codes replaced with their escaped version.
"""
return text.translate(_translate_table)
if __name__ == "__main__": # pragma: no cover
from rich.console import Console
console = Console()
console.print("Look at the title of your terminal window ^")
# console.print(Control((ControlType.SET_WINDOW_TITLE, "Hello, world!")))
for i in range(10):
console.set_window_title("🚀 Loading" + "." * i)
time.sleep(0.5)
Zerion Mini Shell 1.0