How to check whether any window is open in i3 - archlinux

Question

How could I find out whether any window is opened in i3 or not? Like, check if any workspace contains any window.

Answer 1

You can check if any 'visible' window is open in i3 by using xdotool:
You can install xdotool with sudo pacman -S xdotool
WINDOWS=$(xdotool search --all --onlyvisible --desktop $(xprop -notype -root _NET_CURRENT_DESKTOP | cut -c 24-) "" 2>/dev/null)
NUM=$(echo "$WINDOWS" | wc -l)
if [ $NUM -eq 0 ]; then
echo "No windows open."
fi

Answer 2

maybe try i3-save-tree. You must install perl-anyevent-i3 and perl-json-xs first.
https://i3wm.org/docs/layout-saving.html
Example:
$ i3-save-tree --workspace 10
// vim:ts=4:sw=4:et
{
"border": "pixel",
"current_border_width": 1,
"floating": "auto_off",
"geometry": {
"height": 720,
"width": 1366,
"x": 0,
"y": 0
},
"name": "Waterfox Start Page - Waterfox",
"percent": 1,
"swallows": [
{
// "class": "^Waterfox$",
// "instance": "^Navigator$",
// "title": "^Waterfox\\ Start\\ Page\\ \\-\\ Waterfox$",
// "transient_for": "^$",
// "window_role": "^browser$"
}
],
"type": "con"
}