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142 lines
4.7 KiB
Python
142 lines
4.7 KiB
Python
#!/usr/bin/python3
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# -*- coding: utf-8 -*-
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# key-mapper - GUI for device specific keyboard mappings
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# Copyright (C) 2020 sezanzeb <proxima@hip70890b.de>
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#
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# This file is part of key-mapper.
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#
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# key-mapper is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# key-mapper is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with key-mapper. If not, see <https://www.gnu.org/licenses/>.
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"""Device and evdev stuff that is independent from the display server."""
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import multiprocessing
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import evdev
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from keymapper.logger import logger
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from keymapper.config import config
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_devices = None
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class _GetDevicesProcess(multiprocessing.Process):
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"""Process to get the devices that can be worked with.
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Since InputDevice destructors take quite some time, do this
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asynchronously so that they can take as much time as they want without
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slowing down the initialization. To avoid evdevs asyncio stuff spamming
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errors, do this with multiprocessing and not multithreading.
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TODO to threading, make eventloop
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"""
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def __init__(self, pipe):
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"""Construct the process.
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Parameters
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----------
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pipe : multiprocessing.Pipe
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used to communicate the result
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"""
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self.pipe = pipe
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super().__init__()
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def run(self):
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"""Do what get_devices describes."""
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logger.debug('Discovering device paths')
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devices = [evdev.InputDevice(path) for path in evdev.list_devices()]
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# group them together by usb device because there could be stuff like
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# "Logitech USB Keyboard" and "Logitech USB Keyboard Consumer Control"
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grouped = {}
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for device in devices:
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if device.phys.startswith('key-mapper'):
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# injector device, not really periphery
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continue
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# only keyboard devices
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# https://www.kernel.org/doc/html/latest/input/event-codes.html
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capabilities = device.capabilities().keys()
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if evdev.ecodes.EV_KEY not in capabilities:
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continue
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if (
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not config.may_modify_movement_devices()
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and evdev.ecodes.EV_REL in capabilities
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):
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# skip devices that control movement to avoid affecting
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# their performance due to the amount of their events.
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# TODO add checkbox to automatically load
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# a preset on login
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logger.debug(
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'Skipping %s to avoid impairing mouse movement',
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device.path
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)
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continue
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usb = device.phys.split('/')[0]
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if grouped.get(usb) is None:
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grouped[usb] = []
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logger.debug('Found "%s", %s, %s', device.name, device.path, usb)
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grouped[usb].append((device.name, device.path))
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# now write down all the paths of that group
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result = {}
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for group in grouped.values():
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names = [entry[0] for entry in group]
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devs = [entry[1] for entry in group]
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shortest_name = sorted(names, key=len)[0]
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result[shortest_name] = {
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'paths': devs,
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'devices': names
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}
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self.pipe.send(result)
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def refresh_devices():
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"""Get new devices, e.g. new ones created by key-mapper."""
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global _devices
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_devices = None
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return get_devices()
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def get_devices():
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"""Group devices and get relevant infos per group.
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Returns a list containing mappings of
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{group_name: {paths: [paths], devices: [names]} for input devices.
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For example, group_name could be "Logitech USB Keyboard", devices might
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contain "Logitech USB Keyboard System Control" and "Logitech USB Keyboard".
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paths is a list of files in /dev/input that belong to the devices.
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They are grouped by usb port.
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"""
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global _devices
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if _devices is None:
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pipe = multiprocessing.Pipe()
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_GetDevicesProcess(pipe[1]).start()
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# block until devices are available
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_devices = pipe[0].recv()
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if len(_devices) == 0:
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logger.error('Did not find any device')
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else:
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names = [f'"{name}"' for name in _devices]
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logger.info('Found %s', ', '.join(names))
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return _devices
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