next window script idea

i3-nextwindow.py

#!/usr/bin/env python3

import i3ipc
import argparse

if __name__ == "__main__":

    parser = argparse.ArgumentParser(
            description = "Find the next non-opened workspace and go there.")
    parser.add_argument('--startnum',type=int,default = 1,
        help="Set smallest workspace number, usually change to 0 if anything.")
    group = parser.add_mutually_exclusive_group()
    group.add_argument("-mv","--move-window",action="store_true",
            help="Instead of going to next non-opened workspace, move current window there.")
    group.add_argument("-mvf","--move-window-and-follow",action="store_true",
            help="Move current window to next non-opened workspace and follow.")
    args = parser.parse_args()

    startnum = args.startnum
    i3 = i3ipc.Connection()
    workspaces = i3.get_workspaces()
    nums = {w.num for w in workspaces}
    font = workspaces[0].name.split("'")[1]
    s_ = {x for x in range(args.startnum,args.startnum + 20)}
    targetnum = min(s_ - nums)
    targetstring = "{0}:<span font_desc='{1}'> {0} </span>".format(targetnum,font)

    if args.move_window or args.move_window_and_follow:
        i3.command("move container workspace " + targetstring)
    if not args.move_window:
        i3.command("workspace number " + targetstring)

Updated to call by name to make it look the same as when opening with a keybind.