Switch layout by CapsLock (added to startup)

dmgl_switch_layout.py

#!/usr/bin/env python3
import subprocess

from pynput import keyboard

# Switch layout       -       Disable
# Compose key         -       Disable
# ⌘ key behavior      -       Shortcut Overlay
# Caps Lock bevahior  -       Disable

# The shortcuts triggering switch
SWITCH_SHORTCUTS = [

    # {keyboard.Key.caps_lock},
    # {keyboard.KeyCode(66)},

    {keyboard.KeyCode(16777215)},

]

# How many layouts do you have?
LAYOUTS_COUNT = 2


class Switcher:

    def __init__(self):

        self.current_keys = set()
        self.keys_pressed = 0

        # print(self.current_keys)
        # print(self.keys_pressed)

        self.monitored_keys = set()
        for shortcut in SWITCH_SHORTCUTS:
            self.monitored_keys |= shortcut

            print(self.monitored_keys)
            pass

        self.current_layout = 0


    def on_press(self, key):

        if key not in self.monitored_keys:
            # print("Need to detect - ", self.monitored_keys) # this section
            # print("Detected key - ", key)                   # this section
            return

        self.current_keys.add(key)
        self.keys_pressed += 1

        if self.is_switch_shortcut():
            self.on_switch()

    def on_release(self, key):
        self.keys_pressed -= 1

        # Sometimes one key is pressed and another is released.
        # Blame X server.
        if key in self.current_keys:
            self.current_keys.remove(key)

        if self.keys_pressed <= 0:
            # print(".")
            self.keys_pressed = 0
            self.current_keys = set()
            # print(".")

    def is_switch_shortcut(self):
        for shortcut in SWITCH_SHORTCUTS:
            if self.current_keys.issuperset(shortcut):
                return True

        return False

    def on_switch(self):
        self.current_layout += 1
        if self.current_layout >= LAYOUTS_COUNT:
            self.current_layout = 0

        command = [
            "gsettings",
            "set",
            "org.gnome.desktop.input-sources",
            "current",
            str(self.current_layout),
        ]

        print(command)

        _exitcode = subprocess.call(
            command, stdout=subprocess.PIPE, stderr=subprocess.PIPE)


def main():

    switcher = Switcher()

    with keyboard.Listener(
            on_press=switcher.on_press,
            on_release=switcher.on_release) as listener:
        listener.join()


if __name__ == '__main__':
    main()