.zshrc

# Auto-activate virtual environments on cd when it's called `venv/`
# auto activate virtualenv
# Modified solution based on https://stackoverflow.com/questions/45216663/how-to-automatically-activate-virtualenvs-when-cding-into-a-directory/56309561#56309561
function cd() {
  builtin cd "$@"

  ## Default path to virtualenv in your projects
  DEFAULT_ENV_PATH="./venv"

  ## If env folder is found then activate the vitualenv
  function activate_venv() {
    if [[ -f "${DEFAULT_ENV_PATH}/bin/activate" ]] ; then
      source "${DEFAULT_ENV_PATH}/bin/activate"
      echo "Activating ${VIRTUAL_ENV}"
    fi
  }

  if [[ -z "$VIRTUAL_ENV" ]] ; then
    activate_venv
  else
    ## check the current folder belong to earlier VIRTUAL_ENV folder
    # if yes then do nothing
    # else deactivate then run a new env folder check
      parentdir="$(dirname ${VIRTUAL_ENV})"
      if [[ "$PWD"/ != "$parentdir"/* ]] ; then
        echo "Deactivating ${VIRTUAL_ENV}"
        deactivate
        activate_venv
      fi
  fi
}