Split Tmux window simulating vim's nosplitbelow and nosplitright behaviour

Question

Tmux has normal keybindings to split terminals horizontally and vertically. But it splits right and below the currently active pane. Is there a way to split the currently active pane so that the new pane spawns on the left and above the currently active pane?

Answer 1

From man tmux:

     split-window [-bdfhvP] [-c start-directory] [-l size | -p percentage] [-t target-pane]
             [shell-command] [-F format]
                   (alias: splitw)
             Create a new pane by splitting target-pane: -h does a horizontal split and -v a
             vertical split; if neither is specified, -v is assumed.  The -l and -p options
             specify the size of the new pane in lines (for vertical split) or in cells (for
             horizontal split), or as a percentage, respectively.  The -b option causes the
             new pane to be created to the left of or above target-pane.  The -f option cre‐
             ates a new pane spanning the full window height (with -h) or full window width
             (with -v), instead of splitting the active pane.  All other options have the
             same meaning as for the new-window command.

So, putting the following lines in ~/.tmux.conf and sourcing it would result in the desired behavior. Notice the -b option.

# pane splitting
bind -r v split-window -bh
bind -r b split-window -bv