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145 lines
4.7 KiB
Python
145 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 stuff that is independent from the display server."""
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import subprocess
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import evdev
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from keymapper.logger import logger
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_devices = None
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def can_grab(path):
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"""Can input events from the device be read?
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Parameters
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----------
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path : string
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Path in dev, for example '/dev/input/event7'
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"""
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p = subprocess.run(['fuser', '-v', path])
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return p.returncode == 1
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class KeycodeReader:
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"""Keeps reading keycodes in the background for the UI to use.
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A new arriving keycode indicates that a button was pressed, so the
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UI can keep checking for a new keycode on this object and act like the
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keycode went right to the input box.
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GTK inputs cannot listen on keys that don't write a character, so
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they have to repeatedly ask for new data (in this solution).
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"""
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def __init__(self):
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self.virtual_devices = []
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def clear(self):
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"""Next time when reading don't return the previous keycode."""
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# read all of them to clear the buffer or whatever
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for virtual_device in self.virtual_devices:
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while virtual_device.read_one():
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pass
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def start_reading(self, device):
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"""Tell the evdev lib to start looking for keycodes.
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If read is called without prior start_reading, no keycodes
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will be available.
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"""
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logger.debug('Starting reading keycodes for %s', device)
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# Watch over each one of the potentially multiple devices per hardware
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paths = _devices[device]['paths']
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self.virtual_devices = [
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evdev.InputDevice(path)
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for path in paths[:1]
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]
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def read(self):
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"""Get the newest key or None if none was pressed."""
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newest_keycode = None
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for virtual_device in self.virtual_devices:
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while True:
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event = virtual_device.read_one()
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if event is None:
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break
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elif event.type == evdev.ecodes.EV_KEY and event.value == 1:
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# value: 1 for down, 0 for up, 2 for hold.
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# this happens to report key codes that are 8 lower
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# than the ones reported by xev
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newest_keycode = event.code + 8
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return newest_keycode
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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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# cache the result, this takes a second to complete
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global _devices
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if _devices is not None:
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return _devices
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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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# only keyboard devices
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# https://www.kernel.org/doc/html/latest/input/event-codes.html
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if evdev.ecodes.EV_KEY not in device.capabilities().keys():
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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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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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_devices = result
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logger.info('Found %s', ', '.join([f'"{name}"' for name in result]))
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return result
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