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- import argparse
- import pathlib
- import acpi_backlight.evaluate
- _ACPI_BACKLIGHT_ROOT_DIR_PATH = pathlib.Path("/sys/class/backlight")
- class Backlight:
- # pylint: disable=too-few-public-methods; does not count properties
- def __init__(self, name: str = "intel_backlight"):
- self._acpi_dir_path = _ACPI_BACKLIGHT_ROOT_DIR_PATH.joinpath(name)
- @property
- def _brightness_path(self) -> pathlib.Path:
- return self._acpi_dir_path.joinpath("brightness")
- @property
- def _max_brightness_path(self) -> pathlib.Path:
- return self._acpi_dir_path.joinpath("max_brightness")
- @property
- def _brightness_absolute(self) -> int:
- return int(self._brightness_path.read_text(encoding="ascii"))
- @_brightness_absolute.setter
- def _brightness_absolute(self, brightness_absolute: int):
- self._brightness_path.write_text(str(brightness_absolute), encoding="ascii")
- @property
- def _max_brightness_absolute(self) -> int:
- return int(self._max_brightness_path.read_text(encoding="ascii"))
- @property
- def brightness_relative(self) -> float:
- return self._brightness_absolute / self._max_brightness_absolute
- @brightness_relative.setter
- def brightness_relative(self, brightness_relative: float) -> None:
- self._brightness_absolute = round(
- max(0, min(1, brightness_relative)) * self._max_brightness_absolute
- )
- def backlight_eval(expr_str: str) -> None:
- backlight = acpi_backlight.Backlight()
- backlight.brightness_relative = acpi_backlight.evaluate.evaluate_expression(
- expr_str=expr_str, names={"b": backlight.brightness_relative}
- )
- print(backlight.brightness_relative)
- def _main() -> None:
- argparser = argparse.ArgumentParser()
- argparser.add_argument("expr_str")
- args = argparser.parse_args()
- backlight_eval(expr_str=args.expr_str)
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