123 lines
4.5 KiB
Python
123 lines
4.5 KiB
Python
from fabric.core.service import Property, Service, Signal
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from fabric.utils import exec_shell_command_async, logger, monitor_file, os
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def exec_brightnessctl_async(args: str):
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exec_shell_command_async(f"brightnessctl {args}", lambda _: None)
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class Brightness(Service):
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"""Service to manage screen brightness levels."""
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_instance = None
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def __new__(cls):
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if cls._instance is None:
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cls._instance = super().__new__(cls)
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return cls._instance
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@staticmethod
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def get_initial():
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if Brightness._instance is None:
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Brightness._instance = Brightness()
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return Brightness._instance
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@Signal
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def brightness_changed(self, value: int) -> None:
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"""Signal emitted when screen brightness changes."""
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def __init__(self, **kwargs):
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super().__init__(**kwargs)
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# Discover screen backlight device
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screen_device_list = os.listdir("/sys/class/backlight")
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self.screen_device = screen_device_list[0] if screen_device_list else ""
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if self.screen_device == "":
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logger.warning("No screen backlight device detected.")
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self.screen_backlight_path = ""
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self.max_screen = 0
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self.screen_monitor = None
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else:
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self.screen_backlight_path = f"/sys/class/backlight/{self.screen_device}"
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self.max_screen = self._read_max_brightness(self.screen_backlight_path)
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self.screen_monitor = monitor_file(
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f"{self.screen_backlight_path}/brightness", initial_call=True
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)
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self.screen_monitor.connect(
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"changed",
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lambda _, file, *args: self.emit(
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"brightness_changed",
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round(int(file.load_bytes()[0].get_data())),
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),
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)
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logger.info(
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f"Brightness service initialized for device: {self.screen_device}"
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)
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# Discover keyboard backlight device
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kbd_list = os.listdir("/sys/class/leds")
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kbd_filtered = [x for x in kbd_list if "kbd_backlight" in x]
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self.kbd = kbd_filtered[0] if kbd_filtered else ""
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self.kbd_backlight_path = f"/sys/class/leds/{self.kbd}" if self.kbd else ""
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self.max_kbd = self._read_max_brightness(self.kbd_backlight_path)
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def _read_max_brightness(self, path: str) -> int:
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if not path:
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return -1
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max_brightness_path = os.path.join(path, "max_brightness")
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if not os.path.exists(max_brightness_path):
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return -1
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with open(max_brightness_path) as f:
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return int(f.readline())
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@Property(int, "read-write")
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def screen_brightness(self) -> int:
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if not self.screen_backlight_path:
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logger.warning("Cannot get brightness: no screen device.")
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return -1
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brightness_path = os.path.join(self.screen_backlight_path, "brightness")
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if not os.path.exists(brightness_path):
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logger.warning(f"Brightness file does not exist: {brightness_path}")
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return -1
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with open(brightness_path) as f:
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return int(f.readline())
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@screen_brightness.setter
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def screen_brightness(self, value: int):
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if not self.screen_backlight_path:
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logger.warning("Cannot set brightness: no screen device.")
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return
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if not (0 <= value <= self.max_screen):
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value = max(0, min(value, self.max_screen))
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exec_brightnessctl_async(f"--device '{self.screen_device}' set {value}")
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self.emit("brightness_changed", value)
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@Property(int, "read-write")
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def keyboard_brightness(self) -> int: # type: ignore
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if not self.kbd_backlight_path:
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logger.warning("No keyboard backlight device detected.")
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return -1
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with open(self.kbd_backlight_path + "/brightness") as f:
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return int(f.readline())
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@keyboard_brightness.setter
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def keyboard_brightness(self, value: int):
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if not self.kbd_backlight_path:
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logger.warning("No keyboard backlight device detected.")
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return
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if value < 0 or value > self.max_kbd:
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return
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exec_brightnessctl_async(f"--device '{self.kbd}' set {value}")
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@Property(int, "readable")
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def screen_brightness_percentage(self):
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if not self.screen_backlight_path or self.max_screen <= 0:
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return 0
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current_brightness = self.screen_brightness
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return int((current_brightness / self.max_screen) * 100)
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