Sway Windows Manager Alt Tab behavior

alttab

#!/usr/bin/env python3

import sys
import json
import subprocess

direction=bool(sys.argv[1] == 't' or sys.argv[1] == 'T')
swaymsg = subprocess.run(['swaymsg', '-t', 'get_tree'], stdout=subprocess.PIPE)
data = json.loads(swaymsg.stdout)
current = data["nodes"][1]["current_workspace"]
workspace = int(data["nodes"][1]["current_workspace"])-1
roi = data["nodes"][1]["nodes"][workspace]
temp = roi
windows = list()

def getNextWindow():
    if focus < len(windows) - 1:
        return focus+1
    else:
        return 0

def getPrevWindow():
    if focus > 0:
        return focus-1
    else:
        return len(windows)-1

def makelist(temp):
    for nodes in "floating_nodes", "nodes":
        for i in range(len(temp[nodes])):
            if temp[nodes][i]["name"] is None:
               makelist(temp[nodes][i])
            else:
               windows.append(temp[nodes][i])
           
def focused(temp_win):
    for i in range(len(temp_win)):
        if temp_win[i]["focused"] == True:
           return i

makelist(temp)
# print(len(windows))
focus = focused(windows)
if str(sys.argv[1]) == 't' or str(sys.argv[1]) == 'T':
    print(windows[getNextWindow()]["id"])
else:
    print(windows[getPrevWindow()]["id"])

config

bindsym $mod+tab exec swaymsg [con_id=$(swaymsg -t get_tree | ~/.config/sway/alttab t)] focus
bindsym $mod+shift+tab exec swaymsg [con_id=$(swaymsg -t get_tree | ~/.config/sway/alttab f)] focus

I have been successfully using @alejor's version for a while. Now, after an update to sway I believe, it is giving an error for line 11:

Traceback (most recent call last):
  File "/home/[user]/.config/sway/alttab", line 11, in <module>
    current = data["nodes"][1]["current_workspace"]
KeyError: 'nodes'

@curiositry, @alejor 's version work fine. I have just tested both. Feel free to post again if it doesn't work.

@curiositry, I just updated my sway to latest commit and still it works fine. So we would know more details to give you any advice, :)

Thanks for your replies @SidharthArya and @alejor. I have updated to @SidharthArya's latest version, and it is now working. (Curiously, it didn't work until I rebooted; reloading Sway didn't suffice.)

@curiositry Glad to hear it worked.

Adding multi-monitor support to the above contributions:

#!/usr/bin/env python3

import sys
import json
import subprocess

direction=bool(sys.argv[1] == 'next')
swaymsg = subprocess.run(['swaymsg', '-t', 'get_tree'], stdout=subprocess.PIPE)
data = json.loads(swaymsg.stdout)

def setup():
    def dig(nodes):
        if nodes["focused"]:
            return True

        for node_type in "nodes", "floating_nodes":
                if node_type in nodes:
                    for node in nodes[node_type]:
                        if node["focused"] or dig(node):
                            return True

        return False

    for monitor in data["nodes"]:
        for workspace in monitor["nodes"]:

            if workspace["focused"] or dig(workspace):
                return workspace

workspace = setup()
temp = workspace
windows = list()

def getNextWindow():

    if focus < len(windows) - 1:
        return focus+1
    else:
        return 0

def getPrevWindow():

    if focus > 0:
        return focus-1
    else:
        return len(windows)-1

def makelist(temp):
    for nodes in "floating_nodes", "nodes":
        for i in range(len(temp[nodes])):
            if temp[nodes][i]["name"] is None:
               makelist(temp[nodes][i])
            else:
               windows.append(temp[nodes][i])


def focused(temp_win):

    for i in range(len(temp_win)):
        if temp_win[i]["focused"] == True:
           return i
    
    return 9

makelist(temp)
focus = focused(windows)

if direction:
    attr = "[con_id="+str(windows[getNextWindow()]["id"])+"]"
else:
    attr = "[con_id="+str(windows[getPrevWindow()]["id"])+"]"

sway = subprocess.run(['swaymsg', attr, 'focus'])
sys.exit(sway.returncode)

And here is an extension for a multi-monitor aware win+tab to flip workspaces open on a monitor:

#!/usr/bin/env python3
# Original: https://gist.github.com/SidharthArya/f4d80c246793eb61be0ae928c9184406

import sys
import json
import subprocess

target_windows = bool(sys.argv[1] == 'window')
direction=bool(sys.argv[2] == 'next')
swaymsg = subprocess.run(['swaymsg', '-t', 'get_tree'], stdout=subprocess.PIPE)
data = json.loads(swaymsg.stdout)

def setup():
    def dig(nodes):
        if nodes["focused"]:
            return True

        for node_type in "nodes", "floating_nodes":
                if node_type in nodes:
                    for node in nodes[node_type]:
                        if node["focused"] or dig(node):
                            return True

        return False

    for monitor in data["nodes"]:
        for workspace in monitor["nodes"]:
            if workspace["focused"] or dig(workspace):
                return monitor, workspace

monitor, workspace = setup()

def getNext(target_list, focus):

    if focus < len(target_list) - 1:
        return focus+1
    else:
        return 0

def getPrev(target_list, focus):

    if focus > 0:
        return focus-1
    else:
        return len(target_list)-1

def makelist_windows(temp, target_list = []):
    for nodes in "floating_nodes", "nodes":
        for i in range(len(temp[nodes])):
            if temp[nodes][i]["name"] is None:
               makelist_windows(temp[nodes][i], target_list)
            else:
               target_list.append(temp[nodes][i])

    return target_list

def makelist_workspaces(workspaces, target_list = []):
    for workspace in monitor["nodes"]:
        target_list.append(workspace)
    
    return target_list

def focused_window(temp_win):
    for i in range(len(temp_win)):
        if temp_win[i]["focused"] == True:
           return i

def focused_workspace(workspaces, current_workspace):
    for i in range(len(workspaces)):
        if workspaces[i]["name"] == current_workspace["name"]:
           return i

if target_windows:
    target_list = makelist_windows(workspace)
    focus = focused_window(target_list)

    if direction:
        attr = "[con_id="+str(target_list[getNext(target_list, focus)]["id"])+"]"
    else:
        attr = "[con_id="+str(target_list[getPrev(target_list, focus)]["id"])+"]"

    sway = subprocess.run(['swaymsg', attr, 'focus'])
    sys.exit(sway.returncode)

else:
    target_list = makelist_workspaces(monitor)
    if len(target_list) > 1:
        focus = focused_workspace(target_list, workspace)

        if direction:
            attr = target_list[getNext(target_list, focus)]["name"]
        else:
            attr = target_list[getPrev(target_list, focus)]["name"]

        sway = subprocess.run(['swaymsg', 'workspace', attr])
        sys.exit(sway.returncode)

Will this work in i3?

There is quite some room for simplification by using the i3ipc python module:

#!/usr/bin/env python3
import i3ipc
import sys
def main():
    sway = i3ipc.Connection()
    for workspace in [ws for output in sway.get_tree().nodes for ws in output.nodes]:
        focus = workspace.find_focused()
        if focus is None:
            continue
        descendants = [d for d in workspace.descendants() if d.name is not None]
        focus = descendants.index(focus)
        focus = (focus + 1 if sys.argv[1] == "next" else focus - 1) % len(descendants)
        sway.command(f"[con_id={descendants[focus].id}] focus")
        sys.exit()
if __name__ == '__main__':
    main()

Does it work on hyprland as well?