mouse_to_keyboard.py

#!/usr/bin/env python
import evdev
import time
import logging
import os

class MouseToKeyboard(object):

    LOOP_SLEEP = 1

    def __init__(self, mouse_device, mouse_setup_command, button_to_key):
        self.mouse_device = mouse_device
        self.mouse_setup_command = mouse_setup_command
        self.button_to_key = button_to_key

    def loop(self):
        logging.info('Starting execution loop')
        while True:
            try:
                self._do_mapping()
            except Exception as e:
                logging.error('Failed: %s (%s)' %(e, e.__class__))
            time.sleep(self.LOOP_SLEEP)

    def _do_mapping(self):
        logging.info('Opening input device ' + self.mouse_device)
        mouse = evdev.InputDevice(self.mouse_device)
        try:
            self._setup_mouse()
            logging.info('Creatiing uinput repeater mouse')
            with evdev.UInput.from_device(mouse, name=mouse.name+' (repeater)') as repeater_mouse:
                logging.info('Creatiing uinput keyboard')
                with evdev.UInput(name=mouse.name+' (keyboard)') as keyboard:
                    self._read_and_repeat_loop(mouse, repeater_mouse, keyboard)
        finally:
            logging.info('Closing input device ' + self.mouse_device)
            mouse.close()

    def _setup_mouse(self):
        logging.info('Setting up mouse: ' + self.mouse_setup_command)
        exit_code = os.system(self.mouse_setup_command)
        if not exit_code == 0:
            raise RuntimeError('Command exited with ' + exit_code)

    def _read_and_repeat_loop(self, mouse, repeater_mouse, keyboard):
        logging.info('Grabbing mouse')
        mouse.grab()
        logging.info('Starting repeat loop')
        for event in mouse.read_loop():
            logging.debug('Received mouse event: '+ str(event))
            if event.code in self.button_to_key:
                key_name = self.button_to_key[event.code]
                code = getattr(evdev.ecodes, 'KEY_' + key_name)
                logging.debug('Sending keyboard key event: code=%s, value=%s' %(code, event.value))
                keyboard.write(evdev.ecodes.EV_KEY, code, event.value)
                keyboard.syn()
            else:
                repeater_mouse.write_event(event)


MOUSE_DEVICE = '/dev/input/by-id/usb-Logitech_USB-PS_2_Optical_Mouse-event-mouse'
MOUSE_SETUP_COMMAND = '/usr/bin/lomoco --pid=c01e --1200 --sms'
BUTTON_TO_KEY = {
    276: 'C', # j
    275: 'V', # k
    278: 'PAGEUP',
    279: 'PAGEDOWN',
    277: 'HOME',
}
logging.basicConfig(level=logging.INFO)
# logging.basicConfig(level=logging.DEBUG)
MouseToKeyboard(
    mouse_device=MOUSE_DEVICE,
    mouse_setup_command=MOUSE_SETUP_COMMAND,
    button_to_key=BUTTON_TO_KEY,
).loop()