the-screenless-office/screenless/bureau/typing.py

import evdev

from bureau import Bureau

KEYS = {
        0: None, 1: u'ESC', 2: u'1', 3: u'2', 4: u'3', 5: u'4', 6: u'5', 7: u'6', 8: u'7', 9: u'8',
        10: u'9', 11: u'0', 12: u'-', 13: u'=', 14: u'\b', 15: u'\t', 16: u'q', 17: u'w', 18: u'e', 19: u'r',
        20: u't', 21: u'y', 22: u'u', 23: u'i', 24: u'o', 25: u'p', 26: u'[', 27: u']', 28: u'\n', 29: u'LCTRL',
        30: u'a', 31: u's', 32: u'd', 33: u'f', 34: u'g', 35: u'h', 36: u'j', 37: u'k', 38: u'l', 39: u';',
        40: u'"', 41: u'`', 42: u'LSHFT', 43: u'\\', 44: u'z', 45: u'x', 46: u'c', 47: u'v', 48: u'b', 49: u'n',
        50: u'm', 51: u',', 52: u'', 53: u'/', 54: u'RSHFT', 56: u'LALT', 100: u'RALT'
}


class TypingPool(Bureau):
    """
    The typing pool is the bureau that converts keyboard, barcode scanner, etc.
    input to messages and sends them to the responsible bureau.
    """
    name = "Typing Pool"
    prefix = "TY"
    version = 0

    def __init__(self):
        Bureau.__init__(self)

        devices = map(evdev.InputDevice, evdev.list_devices())

        self.devices = []
        self.active_devices = []

        # add anything that smells like a keyboard and grab focus
        for dev in devices:
            try:
                if evdev.ecodes.KEY_A in dev.capabilities()[evdev.ecodes.EV_KEY]:
                    print(dir(dev))
                    print(dev.fn)
                    # dev.grab()
                    self.devices.append(dev)
            except KeyError as err:
                print("ignoring non-keyboard device: " + str(dev))

        # if we don't have any active KB so tell the user to config one
        if "active" in self.config:
            # TODO: better error handling here
            self.active_devices = list(map(evdev.InputDevice,
                                  self.config["active"]["devices"].split()))
        else:
            print("you need to configure input hardware!")
            print("add one of the following devices to TY.ini under [active]")
            print("  devices = /dev/usb/kb1 /dev/input/whatever")
        print("available keyboard devices:")
        for dev in self.devices:
            print(dev.fn, ":", dev.name, dev.info)

    def run_io(self):
        val = ""
        upper = False
        #TODO: this is crap, needs to be multi-threaded and have one
        #      such loop for each active device
        self.active_devices[0].grab()
        # TODO: this is a bit messy / complex. break into one more function.
        for ev in self.active_devices[0].read_loop():
            if ev.type == evdev.ecodes.EV_KEY:
                data = evdev.categorize(ev)
                if data.keystate == 1:
                    if data.scancode == 28:
                        print("sending barcode:", val)
                        self.send(val[0:2], val[2:])
                        val = ""
                    else:
                        try:
                            new_key = KEYS[data.scancode]
                            if new_key == "LSHFT" or new_key == "RSHFT":
                                upper = True
                            else:
                                if upper:
                                    new_key = new_key.upper()
                                    upper = False
                                val += new_key
                        except KeyError:
                            print("Error invalid keycode:", data.scancode)


def main():
    evd = TypingPool()
    evd.run()

if __name__ == "__main__":
    evd = TypingPool()
    evd.run()