This requires the `z` script: https://github.com/rupa/z (and this will only know about directories after you have visited it once, so do that before you can use this for a given path)

gistfile1.txt

#!/usr/bin/env zsh

# Takes a single argument: a partial folder name. If no tmux session is active a new one is started; then we
# - `z $partial; nvim` in a fresh window
# - `z $partial` in a fresh window, left tab
# - `z $partial` in right tab of previous window
main() {
  local new_session=0

  tmux has-session 2> /dev/null
  if [ $? -eq 1 ]; then
    new_session=1
    tmux new-session -d -n ${1}:vim
  else
    tmux new-window -n ${1}:vim
  fi

  tmux send-keys "z ${1}; nvim" Enter
  tmux new-window -n ${1}:shell
  tmux send-keys "z ${1}" Enter
  tmux split-window -h
  # This layout is like 2/3 left pane 1/3 right pane? ish?
  tmux select-layout '55cd,208x54,0,0{120x54,0,0,85,87x54,121,0,86}' > /dev/null
  tmux send-keys "z ${1}" Enter

  # Attach to the new session if we created one
  if [ $new_session -eq 1 ]; then
    tmux attach
  fi
}

main $*