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314 lines
10 KiB
Python
314 lines
10 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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"""Keeps injecting keycodes in the background based on the mapping."""
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import os
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import re
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import asyncio
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import time
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import subprocess
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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.getdevices import get_devices
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from keymapper.state import system_mapping
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from keymapper.dev.macros import parse
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DEV_NAME = 'key-mapper'
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DEVICE_CREATED = 1
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FAILED = 2
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DEVICE_SKIPPED = 3
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# offset between xkb and linux keycodes. linux keycodes are lower
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KEYCODE_OFFSET = 8
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def is_numlock_on():
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"""Get the current state of the numlock."""
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xset_q = subprocess.check_output(['xset', 'q']).decode()
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num_lock_status = re.search(
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r'Num Lock:\s+(.+?)\s',
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xset_q
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)
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if num_lock_status is not None:
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return num_lock_status[1] == 'on'
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return False
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def toggle_numlock():
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"""Turn the numlock on or off."""
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try:
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subprocess.check_output(['numlockx', 'toggle'])
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except FileNotFoundError:
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# doesn't seem to be installed everywhere
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logger.debug('numlockx not found, trying to inject a keycode')
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# and this doesn't always work.
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device = evdev.UInput(
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name=f'key-mapper numlock-control',
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phys='key-mapper',
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)
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device.write(evdev.ecodes.EV_KEY, evdev.ecodes.KEY_NUMLOCK, 1)
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device.syn()
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device.write(evdev.ecodes.EV_KEY, evdev.ecodes.KEY_NUMLOCK, 0)
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device.syn()
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def ensure_numlock(func):
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"""Decorator to reset the numlock to its initial state afterwards."""
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def wrapped(*args, **kwargs):
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# for some reason, grabbing a device can modify the num lock state.
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# remember it and apply back later
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numlock_before = is_numlock_on()
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result = func(*args, **kwargs)
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numlock_after = is_numlock_on()
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if numlock_after != numlock_before:
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logger.debug('Reverting numlock status to %s', numlock_before)
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toggle_numlock()
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return result
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return wrapped
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class KeycodeInjector:
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"""Keeps injecting keycodes in the background based on the mapping.
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Is a process to make it non-blocking for the rest of the code and to
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make running multiple injector easier. There is one procss per
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hardware-device that is being mapped.
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"""
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@ensure_numlock
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def __init__(self, device, mapping):
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"""Start injecting keycodes based on custom_mapping.
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Parameters
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----------
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device : string
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the name of the device as available in get_device
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"""
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self.device = device
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self.mapping = mapping
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self._process = None
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def start_injecting(self):
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"""Start injecting keycodes."""
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self._process = multiprocessing.Process(target=self._start_injecting)
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self._process.start()
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def _prepare_device(self, path):
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"""Try to grab the device, return if not needed/possible."""
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device = evdev.InputDevice(path)
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if device is None:
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return None
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capabilities = device.capabilities(absinfo=False)[evdev.ecodes.EV_KEY]
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needed = False
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for keycode, _ in self.mapping:
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if keycode - KEYCODE_OFFSET in capabilities:
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needed = True
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break
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if not needed:
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# skipping reading and checking on events from those devices
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# may be beneficial for performance.
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logger.debug('No need to grab %s', device.path)
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return None
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attempts = 0
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while True:
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device = evdev.InputDevice(path)
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try:
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# grab to avoid e.g. the disabled keycode of 10 to confuse
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# X, especially when one of the buttons of your mouse also
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# uses 10. This also avoids having to load an empty xkb
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# symbols file to prevent writing any unwanted keys.
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device.grab()
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break
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except IOError:
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attempts += 1
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logger.debug('Failed attemt to grab %s %d', path, attempts)
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if attempts >= 4:
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logger.error('Cannot grab %s, it is possibly in use', path)
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return None
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# it might take a little time until the device is free if
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# it was previously grabbed.
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time.sleep(0.15)
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return device
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def _modify_capabilities(self, input_device):
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"""Adds all keycode into a copy of a devices capabilities.
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Prameters
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---------
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input_device : evdev.InputDevice
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"""
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# copy the capabilities because the keymapper_device is going
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# to act like the device.
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capabilities = input_device.capabilities(absinfo=False)
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# However, make sure that it supports all keycodes, not just some
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# random ones, because the mapping could contain anything.
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# That's why I avoid from_device for this
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capabilities[evdev.ecodes.EV_KEY] = list(evdev.ecodes.keys.keys())
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# just like what python-evdev does in from_device
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if evdev.ecodes.EV_SYN in capabilities:
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del capabilities[evdev.ecodes.EV_SYN]
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if evdev.ecodes.EV_FF in capabilities:
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del capabilities[evdev.ecodes.EV_FF]
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return capabilities
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def _start_injecting(self):
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"""The injection worker that keeps injecting until terminated.
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Stuff is non-blocking by using asyncio in order to do multiple things
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somewhat concurrently.
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"""
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loop = asyncio.get_event_loop()
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coroutines = []
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paths = get_devices()[self.device]['paths']
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logger.info('Starting injecting the mapping for %s', self.device)
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# Watch over each one of the potentially multiple devices per hardware
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for path in paths:
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input_device = self._prepare_device(path)
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if input_device is None:
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continue
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uinput = evdev.UInput(
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name=f'key-mapper {input_device.name}',
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phys='key-mapper',
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events=self._modify_capabilities(input_device)
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)
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coroutine = self._injection_loop(input_device, uinput)
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coroutines.append(coroutine)
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if len(coroutines) == 0:
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raise OSError('Could not grab any device')
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loop.run_until_complete(asyncio.gather(*coroutines))
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def _write(self, device, keycode, value):
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"""Actually inject."""
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device.write(
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evdev.ecodes.EV_KEY,
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keycode - KEYCODE_OFFSET,
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value
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)
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device.syn()
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async def _injection_loop(self, device, keymapper_device):
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"""Inject keycodes for one of the virtual devices.
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Parameters
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----------
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device : evdev.InputDevice
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where to read keycodes from
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keymapper_device : evdev.UInput
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where to write keycodes to
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"""
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logger.debug(
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'Started injecting into %s, fd %s',
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keymapper_device.device.path, keymapper_device.fd
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)
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async for event in device.async_read_loop():
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if event.type != evdev.ecodes.EV_KEY:
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keymapper_device.write(event.type, event.code, event.value)
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# this already includes SYN events, so need to syn here again
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continue
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if event.value == 2:
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# linux does them itself, no need to trigger them
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continue
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input_keycode = event.code + KEYCODE_OFFSET
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character = self.mapping.get_character(input_keycode)
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if character is None:
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# unknown keycode, forward it
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target_keycode = input_keycode
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elif '(' in character:
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# must be a macro
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logger.spam(
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'got code:%s value:%s, maps to macro %s',
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event.code + KEYCODE_OFFSET,
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event.value,
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character
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)
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# TODO prepare this beforehand, not on each keystroke
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parse(
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character,
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handler=lambda keycode, value: (
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self._write(
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keymapper_device,
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target_keycode,
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event.value
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)
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)
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).run()
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else:
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target_keycode = system_mapping.get_keycode(character)
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if target_keycode is None:
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logger.error(
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'Cannot find character %s in the internal mapping',
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character
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)
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continue
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logger.spam(
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'got code:%s value:%s, maps to code:%s char:%s',
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event.code + KEYCODE_OFFSET,
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event.value,
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target_keycode,
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character
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)
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self._write(keymapper_device, target_keycode, event.value)
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# this should only ever happen in tests to avoid blocking them
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# forever, as soon as all events are consumed. In normal operation
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# there is no end to the events.
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logger.error(
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'The injector for "%s" stopped early',
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keymapper_device.device.path
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)
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@ensure_numlock
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def stop_injecting(self):
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"""Stop injecting keycodes."""
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logger.info('Stopping injecting keycodes for device %s', self.device)
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if self._process is not None and self._process.is_alive():
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self._process.terminate()
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