Execute venv/bin/activate etc. when entering specific directory

.bashrc

exec-venv(){
  case "$PWD" in
  */some-dir-with-venv)
    if [ -z "${VIRTUAL_ENV}" ]; then
      . ./venv/bin/activate
      ## Some other commands here
    fi
    ;;
  */some-dir-with-venv/*)
    ## won't do anything
    ;;
  *)
    ## when exit from repository directories
    if [ "${VIRTUAL_ENV}" ]; then
      deactivate
      ## Some other commands here
    fi
    ;;
  esac
}

export PROMPT_COMMAND="exec-venv"