switch_window - alternative version for Gnome on Wayland

switch_window.py

#!/usr/bin/python3

import dbus
from pprint import pprint
import json
import sys
import time;


def focus_wnd(proxy, id):

    (ok, res) = proxy.Eval(
        """
        global.get_window_actors()
           .map(a=>a.meta_window)
           .find(w=> w.get_id() == %s)
           .activate(%s)

        """%(target_wnd_id, int(time.time())),
        dbus_interface='org.gnome.Shell')

    if ok:
        print('ok')
    else:
        print('couldnt focus on window')


    pass


if __name__ == "__main__":

    which_wnd_class = sys.argv[1]


    sessbus = dbus.SessionBus()
    proxy = sessbus.get_object( 'org.gnome.Shell', '/org/gnome/Shell')

    (ok, res) = proxy.Eval(
        """
        global.get_window_actors()
           .map(a=>a.meta_window)
           .filter(w => w.has_focus() == false)
           .filter(w => w.get_wm_class() != 'Gnome-shell')
           .map(w=>({id: w.get_id(), class: w.get_wm_class(), title: w.get_title()}))
        """,
        dbus_interface='org.gnome.Shell')

    if ok:

        windows = json.loads(str(res))

        if which_wnd_class == 'debug':

            for w in windows:
                print("%s\t%s\t%s"%(w['id'], w['class'], w['title']))

            exit(0)

        by_class = list(filter(
            lambda x: x['class'] == which_wnd_class,
            windows
        ))

        if len(by_class) > 0:
            target_wnd_id = by_class[-1]['id']

            focus_wnd(proxy, target_wnd_id)
        else:
            # if no unfocused window of the requested class is found,
            # focus on the second topmost from the stack regardless of class.
            # this is equivalent of hitting alt+tab
            target_wnd_id = windows[-1]['id']

            focus_wnd(proxy, target_wnd_id)


    else:
        print('error while communicating via dbus')


    pass