mirror of
https://github.com/sezanzeb/input-remapper
synced 2024-11-02 15:40:19 +00:00
579 lines
19 KiB
Python
579 lines
19 KiB
Python
#!/usr/bin/python3
|
|
# -*- coding: utf-8 -*-
|
|
# key-mapper - GUI for device specific keyboard mappings
|
|
# Copyright (C) 2021 sezanzeb <proxima@hip70890b.de>
|
|
#
|
|
# This file is part of key-mapper.
|
|
#
|
|
# key-mapper is free software: you can redistribute it and/or modify
|
|
# it under the terms of the GNU General Public License as published by
|
|
# the Free Software Foundation, either version 3 of the License, or
|
|
# (at your option) any later version.
|
|
#
|
|
# key-mapper is distributed in the hope that it will be useful,
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
# GNU General Public License for more details.
|
|
#
|
|
# You should have received a copy of the GNU General Public License
|
|
# along with key-mapper. If not, see <https://www.gnu.org/licenses/>.
|
|
|
|
|
|
"""Keeps injecting keycodes in the background based on the mapping."""
|
|
|
|
|
|
import re
|
|
import asyncio
|
|
import time
|
|
import subprocess
|
|
import multiprocessing
|
|
|
|
import evdev
|
|
from evdev.ecodes import EV_KEY, EV_REL
|
|
|
|
from keymapper.logger import logger
|
|
from keymapper.getdevices import get_devices, is_gamepad
|
|
from keymapper.dev.keycode_mapper import KeycodeMapper
|
|
from keymapper.dev import utils
|
|
from keymapper.dev.event_producer import EventProducer
|
|
from keymapper.dev.macros import parse, is_this_a_macro
|
|
from keymapper.state import system_mapping
|
|
from keymapper.mapping import DISABLE_CODE
|
|
from keymapper.config import NONE, MOUSE, WHEEL
|
|
|
|
|
|
DEV_NAME = 'key-mapper'
|
|
|
|
# messages
|
|
CLOSE = 0
|
|
OK = 1
|
|
|
|
# states
|
|
UNKNOWN = -1
|
|
STARTING = 2
|
|
FAILED = 3
|
|
RUNNING = 4
|
|
STOPPED = 5
|
|
|
|
# for both states and messages
|
|
NO_GRAB = 6
|
|
|
|
|
|
def is_numlock_on():
|
|
"""Get the current state of the numlock."""
|
|
try:
|
|
xset_q = subprocess.check_output(
|
|
['xset', 'q'],
|
|
stderr=subprocess.STDOUT
|
|
).decode()
|
|
num_lock_status = re.search(
|
|
r'Num Lock:\s+(.+?)\s',
|
|
xset_q
|
|
)
|
|
|
|
if num_lock_status is not None:
|
|
return num_lock_status[1] == 'on'
|
|
|
|
return False
|
|
except subprocess.CalledProcessError:
|
|
# tty
|
|
return None
|
|
|
|
|
|
def set_numlock(state):
|
|
"""Set the numlock to a given state of True or False."""
|
|
if state is None:
|
|
return
|
|
|
|
value = {
|
|
True: 'on',
|
|
False: 'off'
|
|
}[state]
|
|
|
|
try:
|
|
subprocess.check_output(['numlockx', value])
|
|
except subprocess.CalledProcessError:
|
|
# might be in a tty
|
|
pass
|
|
except FileNotFoundError:
|
|
# doesn't seem to be installed everywhere
|
|
logger.debug('numlockx not found')
|
|
|
|
|
|
def ensure_numlock(func):
|
|
"""Decorator to reset the numlock to its initial state afterwards."""
|
|
def wrapped(*args, **kwargs):
|
|
# for some reason, grabbing a device can modify the num lock state.
|
|
# remember it and apply back later
|
|
numlock_before = is_numlock_on()
|
|
|
|
result = func(*args, **kwargs)
|
|
|
|
set_numlock(numlock_before)
|
|
|
|
return result
|
|
return wrapped
|
|
|
|
|
|
def is_in_capabilities(key, capabilities):
|
|
"""Are this key or one of its sub keys in the capabilities?
|
|
|
|
Parameters
|
|
----------
|
|
key : Key
|
|
"""
|
|
for sub_key in key:
|
|
if sub_key[1] in capabilities.get(sub_key[0], []):
|
|
return True
|
|
|
|
return False
|
|
|
|
|
|
class Injector:
|
|
"""Keeps injecting events in the background based on mapping and config.
|
|
|
|
Is a process to make it non-blocking for the rest of the code and to
|
|
make running multiple injector easier. There is one process per
|
|
hardware-device that is being mapped.
|
|
"""
|
|
regrab_timeout = 0.5
|
|
|
|
def __init__(self, device, mapping):
|
|
"""Start injecting keycodes based on custom_mapping.
|
|
|
|
Parameters
|
|
----------
|
|
device : string
|
|
the name of the device as available in get_device
|
|
mapping : Mapping
|
|
"""
|
|
self.device = device
|
|
|
|
self.mapping = mapping
|
|
|
|
self._process = None
|
|
self._msg_pipe = multiprocessing.Pipe()
|
|
self._key_to_code = self._map_keys_to_codes()
|
|
self._state = UNKNOWN
|
|
self._event_producer = None
|
|
|
|
def _forwards_joystick(self):
|
|
"""If at least one of the joysticks remains a regular joystick."""
|
|
left_purpose = self.mapping.get('gamepad.joystick.left_purpose')
|
|
right_purpose = self.mapping.get('gamepad.joystick.right_purpose')
|
|
return NONE in (left_purpose, right_purpose)
|
|
|
|
def _maps_joystick(self):
|
|
"""If at least one of the joysticks will serve a special purpose."""
|
|
left_purpose = self.mapping.get('gamepad.joystick.left_purpose')
|
|
right_purpose = self.mapping.get('gamepad.joystick.right_purpose')
|
|
return (left_purpose, right_purpose) != (NONE, NONE)
|
|
|
|
def _joystick_as_mouse(self):
|
|
"""If at least one joystick maps to an EV_REL capability."""
|
|
purposes = (
|
|
self.mapping.get('gamepad.joystick.left_purpose'),
|
|
self.mapping.get('gamepad.joystick.right_purpose')
|
|
)
|
|
return MOUSE in purposes or WHEEL in purposes
|
|
|
|
def _map_keys_to_codes(self):
|
|
"""To quickly get target keycodes during operation.
|
|
|
|
Returns a mapping of one or more 3-tuples to ints.
|
|
Examples:
|
|
((1, 2, 1),): 3
|
|
((1, 5, 1), (1, 4, 1)): 4
|
|
"""
|
|
key_to_code = {}
|
|
for key, output in self.mapping:
|
|
if is_this_a_macro(output):
|
|
continue
|
|
|
|
target_code = system_mapping.get(output)
|
|
if target_code is None:
|
|
logger.error('Don\'t know what %s is', output)
|
|
continue
|
|
|
|
for permutation in key.get_permutations():
|
|
if permutation.keys[-1][-1] not in [-1, 1]:
|
|
logger.error(
|
|
'Expected values to be -1 or 1 at this point: %s',
|
|
permutation.keys
|
|
)
|
|
key_to_code[permutation.keys] = target_code
|
|
|
|
return key_to_code
|
|
|
|
def start_injecting(self):
|
|
"""Start injecting keycodes."""
|
|
if self._process is not None:
|
|
# So that there is less concern about integrity when putting
|
|
# stuff into self. Each injector object can only be
|
|
# started once.
|
|
raise Exception('Please construct a new injector instead')
|
|
|
|
if self.device not in get_devices():
|
|
logger.error('Cannot inject for unknown device "%s"', self.device)
|
|
return
|
|
|
|
self._state = STARTING
|
|
self._process = multiprocessing.Process(target=self._start_injecting)
|
|
self._process.start()
|
|
|
|
def get_state(self):
|
|
"""Get the state of the injection."""
|
|
# only at this point the actual state is figured out
|
|
if self._state == STARTING and self._msg_pipe[1].poll():
|
|
msg = self._msg_pipe[1].recv()
|
|
if msg == OK:
|
|
self._state = RUNNING
|
|
|
|
if msg == NO_GRAB:
|
|
self._state = NO_GRAB
|
|
|
|
alive = self._process is not None and self._process.is_alive()
|
|
if self._state in [STARTING, RUNNING] and not alive:
|
|
self._state = FAILED
|
|
logger.error('Injector was unexpectedly found stopped')
|
|
|
|
return self._state
|
|
|
|
def _grab_device(self, path):
|
|
"""Try to grab the device, return None if not needed/possible."""
|
|
try:
|
|
device = evdev.InputDevice(path)
|
|
except (FileNotFoundError, OSError):
|
|
logger.error('Could not find "%s"', path)
|
|
return None
|
|
|
|
capabilities = device.capabilities(absinfo=False)
|
|
|
|
needed = False
|
|
for key, _ in self.mapping:
|
|
if is_in_capabilities(key, capabilities):
|
|
needed = True
|
|
break
|
|
|
|
gamepad = is_gamepad(device)
|
|
|
|
if gamepad and self._maps_joystick():
|
|
needed = True
|
|
|
|
if not needed:
|
|
# skipping reading and checking on events from those devices
|
|
# may be beneficial for performance.
|
|
logger.debug('No need to grab %s', path)
|
|
return None
|
|
|
|
attempts = 0
|
|
while True:
|
|
try:
|
|
# grab to avoid e.g. the disabled keycode of 10 to confuse
|
|
# X, especially when one of the buttons of your mouse also
|
|
# uses 10. This also avoids having to load an empty xkb
|
|
# symbols file to prevent writing any unwanted keys.
|
|
device.grab()
|
|
logger.debug('Grab %s', path)
|
|
break
|
|
except IOError as error:
|
|
attempts += 1
|
|
|
|
# it might take a little time until the device is free if
|
|
# it was previously grabbed.
|
|
logger.debug('Failed attempts to grab %s: %d', path, attempts)
|
|
|
|
if attempts >= 4:
|
|
logger.error('Cannot grab %s, it is possibly in use', path)
|
|
logger.error(str(error))
|
|
return None
|
|
|
|
time.sleep(self.regrab_timeout)
|
|
|
|
return device
|
|
|
|
def _modify_capabilities(self, macros, input_device, gamepad):
|
|
"""Adds all used keycodes into a copy of a devices capabilities.
|
|
|
|
Sometimes capabilities are a bit tricky and change how the system
|
|
interprets the device.
|
|
|
|
Parameters
|
|
----------
|
|
macros : dict
|
|
mapping of int to _Macro
|
|
input_device : evdev.InputDevice
|
|
gamepad : bool
|
|
if ABS capabilities should be removed in favor of REL
|
|
|
|
Returns
|
|
-------
|
|
a mapping of int event type to an array of int event codes.
|
|
Without absinfo.
|
|
"""
|
|
ecodes = evdev.ecodes
|
|
|
|
# copy the capabilities because the uinput is going
|
|
# to act like the device.
|
|
capabilities = input_device.capabilities(absinfo=False)
|
|
|
|
if (self._key_to_code or macros) and capabilities.get(EV_KEY) is None:
|
|
capabilities[EV_KEY] = []
|
|
|
|
# Furthermore, support all injected keycodes
|
|
for code in self._key_to_code.values():
|
|
if code == DISABLE_CODE:
|
|
continue
|
|
|
|
if code not in capabilities[EV_KEY]:
|
|
capabilities[EV_KEY].append(code)
|
|
|
|
# and all keycodes that are injected by macros
|
|
for macro in macros.values():
|
|
capabilities[EV_KEY] += list(macro.get_capabilities())
|
|
|
|
if gamepad and self._joystick_as_mouse():
|
|
# REL_WHEEL was also required to recognize the gamepad
|
|
# as mouse, even if no joystick is used as wheel.
|
|
capabilities[EV_REL] = [
|
|
evdev.ecodes.REL_X,
|
|
evdev.ecodes.REL_Y,
|
|
evdev.ecodes.REL_WHEEL,
|
|
evdev.ecodes.REL_HWHEEL,
|
|
]
|
|
|
|
if capabilities.get(EV_KEY) is None:
|
|
capabilities[EV_KEY] = []
|
|
|
|
if ecodes.BTN_MOUSE not in capabilities[EV_KEY]:
|
|
# to be able to move the cursor, this key capability is
|
|
# needed
|
|
capabilities[EV_KEY].append(ecodes.BTN_MOUSE)
|
|
|
|
# just like what python-evdev does in from_device
|
|
if ecodes.EV_SYN in capabilities:
|
|
del capabilities[ecodes.EV_SYN]
|
|
if ecodes.EV_FF in capabilities:
|
|
del capabilities[ecodes.EV_FF]
|
|
if gamepad and not self._forwards_joystick():
|
|
# Key input to text inputs and such only works without ABS
|
|
# events in the capabilities, possibly due to some intentional
|
|
# constraints in wayland/X. So if the joysticks are not used
|
|
# as joysticks remove ABS.
|
|
del capabilities[ecodes.EV_ABS]
|
|
|
|
if ecodes.ABS_VOLUME in capabilities.get(ecodes.EV_ABS, []):
|
|
# For some reason an ABS_VOLUME capability likes to appear
|
|
# for some users. It prevents mice from moving around and
|
|
# keyboards from writing characters
|
|
capabilities[ecodes.EV_ABS].remove(ecodes.ABS_VOLUME)
|
|
|
|
return capabilities
|
|
|
|
async def _msg_listener(self):
|
|
"""Wait for messages from the main process to do special stuff."""
|
|
loop = asyncio.get_event_loop()
|
|
while True:
|
|
frame_available = asyncio.Event()
|
|
loop.add_reader(self._msg_pipe[0].fileno(), frame_available.set)
|
|
await frame_available.wait()
|
|
frame_available.clear()
|
|
msg = self._msg_pipe[0].recv()
|
|
if msg == CLOSE:
|
|
logger.debug('Received close signal')
|
|
# stop the event loop and cause the process to reach its end
|
|
# cleanly. Using .terminate prevents coverage from working.
|
|
loop.stop()
|
|
return
|
|
|
|
def _start_injecting(self):
|
|
"""The injection worker that keeps injecting until terminated.
|
|
|
|
Stuff is non-blocking by using asyncio in order to do multiple things
|
|
somewhat concurrently.
|
|
|
|
Use this function as starting point in a process. It creates
|
|
the loops needed to read and map events and keeps running them.
|
|
"""
|
|
# create a new event loop, because somehow running an infinite loop
|
|
# that sleeps on iterations (event_producer) in one process causes
|
|
# another injection process to screw up reading from the grabbed
|
|
# device.
|
|
loop = asyncio.new_event_loop()
|
|
asyncio.set_event_loop(loop)
|
|
|
|
numlock_state = is_numlock_on()
|
|
|
|
coroutines = []
|
|
|
|
logger.info('Starting injecting the mapping for "%s"', self.device)
|
|
|
|
paths = get_devices()[self.device]['paths']
|
|
|
|
self._event_producer = EventProducer(self.mapping)
|
|
|
|
# Watch over each one of the potentially multiple devices per hardware
|
|
for path in paths:
|
|
source = self._grab_device(path)
|
|
if source is None:
|
|
# this path doesn't need to be grabbed for injection, because
|
|
# it doesn't provide the events needed to execute the mapping
|
|
continue
|
|
|
|
# each device needs own macro instances to add a custom handler
|
|
logger.debug('Parsing macros for %s', path)
|
|
macros = {}
|
|
for key, output in self.mapping:
|
|
if is_this_a_macro(output):
|
|
macro = parse(output, self.mapping)
|
|
if macro is None:
|
|
continue
|
|
|
|
for permutation in key.get_permutations():
|
|
macros[permutation.keys] = macro
|
|
|
|
if len(macros) == 0:
|
|
logger.debug('No macros configured')
|
|
|
|
# certain capabilities can have side effects apparently. with an
|
|
# EV_ABS capability, EV_REL won't move the mouse pointer anymore.
|
|
# so don't merge all InputDevices into one UInput device.
|
|
gamepad = is_gamepad(source)
|
|
uinput = evdev.UInput(
|
|
name=f'{DEV_NAME} {self.device}',
|
|
phys=DEV_NAME,
|
|
events=self._modify_capabilities(macros, source, gamepad)
|
|
)
|
|
|
|
logger.spam(
|
|
'Injected capabilities for "%s": %s',
|
|
path, uinput.capabilities(verbose=True)
|
|
)
|
|
|
|
def handler(*args, uinput=uinput):
|
|
# this ensures that the right uinput is used for macro_write,
|
|
# because this is within a loop
|
|
self._macro_write(*args, uinput)
|
|
|
|
for macro in macros.values():
|
|
macro.set_handler(handler)
|
|
|
|
# actual reading of events
|
|
coroutines.append(self._event_consumer(macros, source, uinput))
|
|
|
|
# The event source of the current iteration will deliver events
|
|
# that are needed for this. It is that one that will be mapped
|
|
# to a mouse-like devnode.
|
|
if gamepad and self._joystick_as_mouse():
|
|
self._event_producer.set_max_abs_from(source)
|
|
self._event_producer.set_mouse_uinput(uinput)
|
|
|
|
if len(coroutines) == 0:
|
|
logger.error('Did not grab any device')
|
|
self._msg_pipe[0].send(NO_GRAB)
|
|
return
|
|
|
|
coroutines.append(self._msg_listener())
|
|
|
|
# run besides this stuff
|
|
coroutines.append(self._event_producer.run())
|
|
|
|
# set the numlock state to what it was before injecting, because
|
|
# grabbing devices screws this up
|
|
set_numlock(numlock_state)
|
|
|
|
self._msg_pipe[0].send(OK)
|
|
|
|
try:
|
|
loop.run_until_complete(asyncio.gather(*coroutines))
|
|
except RuntimeError:
|
|
# stopped event loop most likely
|
|
pass
|
|
except OSError as error:
|
|
logger.error(str(error))
|
|
|
|
if len(coroutines) > 0:
|
|
# expected when stop_injecting is called,
|
|
# during normal operation as well as tests this point is not
|
|
# reached otherwise.
|
|
logger.debug('asyncio coroutines ended')
|
|
|
|
def _macro_write(self, code, value, uinput):
|
|
"""Handler for macros."""
|
|
logger.spam('macro writes %s', (EV_KEY, code, value))
|
|
uinput.write(EV_KEY, code, value)
|
|
uinput.syn()
|
|
|
|
async def _event_consumer(self, macros, source, uinput):
|
|
"""Reads input events to inject keycodes or talk to the event_producer.
|
|
|
|
Can be stopped by stopping the asyncio loop. This loop
|
|
reads events from a single device only. Other devnodes may be
|
|
present for the hardware device, in which case this needs to be
|
|
started multiple times.
|
|
|
|
Parameters
|
|
----------
|
|
macros : int: _Macro
|
|
macro with a handler that writes to the provided uinput
|
|
source : evdev.InputDevice
|
|
where to read keycodes from
|
|
uinput : evdev.UInput
|
|
where to write keycodes to
|
|
"""
|
|
logger.debug(
|
|
'Started consumer to inject to %s, fd %s',
|
|
source.path, source.fd
|
|
)
|
|
|
|
keycode_handler = KeycodeMapper(
|
|
source, self.mapping, uinput,
|
|
self._key_to_code, macros
|
|
)
|
|
|
|
async for event in source.async_read_loop():
|
|
if self._event_producer.is_handled(event):
|
|
# the event_producer will take care of it
|
|
self._event_producer.notify(event)
|
|
continue
|
|
|
|
# for mapped stuff
|
|
if utils.should_map_event_as_btn(event, self.mapping):
|
|
will_report_key_up = utils.will_report_key_up(event)
|
|
|
|
keycode_handler.handle_keycode(
|
|
event,
|
|
)
|
|
|
|
if not will_report_key_up:
|
|
# simulate a key-up event if no down event arrives anymore.
|
|
# this may release macros, combinations or keycodes.
|
|
release = evdev.InputEvent(0, 0, event.type, event.code, 0)
|
|
self._event_producer.debounce(
|
|
debounce_id=(event.type, event.code, event.value),
|
|
func=keycode_handler.handle_keycode,
|
|
args=(
|
|
release,
|
|
False
|
|
),
|
|
ticks=3,
|
|
)
|
|
|
|
continue
|
|
|
|
# forward the rest
|
|
uinput.write(event.type, event.code, event.value)
|
|
# this already includes SYN events, so need to syn here again
|
|
|
|
logger.error(
|
|
'The consumer for "%s" stopped early',
|
|
source.path
|
|
)
|
|
|
|
@ensure_numlock
|
|
def stop_injecting(self):
|
|
"""Stop injecting keycodes."""
|
|
logger.info('Stopping injecting keycodes for device "%s"', self.device)
|
|
self._msg_pipe[1].send(CLOSE)
|
|
self._state = STOPPED
|