Tmux: create pane if I'm not in edge I want to create some same function like Nick Nisi's window management in vim (if I'm in the edge, create a new window(in vim)/pane, otherwise just move). I don't know how to check, if I'm in the edge..

There are formats for this: pane_at_left, pane_at_right, pane_at_top, pane_at_bottom.