103 lines
2.8 KiB
Python
Executable file
103 lines
2.8 KiB
Python
Executable file
#!/usr/bin/python3
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"""Watch for HDMI connection state change and update screen layout."""
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import json
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import os
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import subprocess
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import sys
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import time
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from typing import Any
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import pyudev
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context = pyudev.Context()
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monitor = pyudev.Monitor.from_netlink(context)
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# description of an HDMI connection state change
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want = {
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"action": "change",
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"device_node": "/dev/dri/card0",
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"device_type": "drm_minor",
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"sys_path": "/sys/devices/pci0000:00/0000:00:02.0/drm/card0",
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"sys_name": "card0",
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}
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def run_swaymsg() -> bytes:
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"""Run swaymsg to get list of outputs."""
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p = subprocess.run(["swaymsg", "-r", "-t", "get_outputs"], capture_output=True)
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return p.stdout
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def get_outputs(attempts: int = 10) -> dict[str, dict[str, Any]] | None:
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"""Ask sway for the current list of outputs."""
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for attempt in range(attempts):
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outputs = run_swaymsg()
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if outputs.strip() == b"":
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return None
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try:
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json_data = json.loads(outputs)
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break
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except json.decoder.JSONDecodeError:
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print("JSON parse error")
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print(outputs)
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if attempt == attempts - 1:
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raise
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time.sleep(1)
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return {o["name"]: o for o in json_data}
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def is_sony_tv(output: dict[str, Any]) -> bool:
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"""Is a given output a Sony TV."""
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return bool(output["make"] == "Sony" and output["model"] == "SONY TV")
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def sony_tv_connected() -> None:
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"""Run command when HDMI is connected."""
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subprocess.run([os.path.expanduser("~/bin/desk")])
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def hdmi_disconnected() -> None:
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"""Run command when HDMI is disconnected."""
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subprocess.run([os.path.expanduser("~/bin/unplugged")])
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def is_output_connected(name: str) -> bool:
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"""Is HDMI connected."""
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state = open(f"/sys/class/drm/card0-{name}/status").read()
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states = {"connected\n": True, "disconnected\n": False}
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if state not in states:
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print(f"unknown state: [{state}]")
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sys.exit(1)
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return states[state]
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def handle_state_change() -> str:
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"""Something happened, check and handle state change."""
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hdmi_name = "HDMI-A-1"
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if not is_output_connected(hdmi_name):
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hdmi_disconnected()
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return "HDMI disconnected, switching to laptop screen."
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hdmi = get_outputs().get(hdmi_name)
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if hdmi and is_sony_tv(hdmi):
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sony_tv_connected()
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return "Sony TV connected to HDMI, switching to desk layout."
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return "Unknown device connected to HDMI, doing nothing."
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def watch() -> None:
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"""Watch for state change and respond."""
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d: pyudev.Device
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for d in iter(monitor.poll, None):
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if all(getattr(d, key) == value for key, value in want.items()):
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print(handle_state_change())
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if __name__ == "__main__":
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handle_state_change()
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watch()
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