tree_active_pane.sh

#!/usr/bin/env zsh

function pwdx {
  lsof -a -d cwd -p $1 -n -Fn | awk '/^n/ {print substr($0,2)}'
}

function tree_active_pane () {
  #get the pid and wd
  active_pane_pid=$(tmux list-panes -F '#{pane_active} #{pane_pid}' | grep -o '^1[[:space:]][0-9]\+$' | grep -o '\w[0-9]\+')
  active_wd=$(pwdx $active_pane_pid)
  #list file tree with color and 2 layer
  tree -LC 1 $active_wd
}

# allow subprocess to access the function 
export -f pwdx
export -f tree_active_pane

watch -tcn 1 tree_active_pane