# Activates autoenv or reports its failure

  () {
  if ! type autoenv_init >/dev/null; then
    for d (~/.autoenv /usr/local/opt/autoenv); do
      if [[ -e $d/activate.sh ]]; then
        autoenv_dir=$d
        break
      fi
    done
    if [[ -z $autoenv_dir ]]; then 
      cat <<END >&2
  -------- AUTOENV ---------
  Could not locate autoenv installation.
  Please check if autoenv is correctly installed.
  In the meantime the autoenv plugin is DISABLED.
  --------------------------
  END
      return 1
    fi
    source $autoenv_dir/activate.sh

  fi

  }
  [[ $? != 0 ]] && return $?

  
  # The use_env call below is a reusable command to activate/create a new Python
  # virtualenv, requiring only a single declarative line of code in your .env files.
  # It only performs an action if the requested virtualenv is not the current one.
  
  use_env() {
      typeset venv
      venv="$1"
      if [[ "${VIRTUAL_ENV:t}" != "$venv" ]]; then
          if workon | grep -q "$venv"; then
              workon "$venv"
          else
              echo -n "Create virtualenv $venv now? (Yn) "
              read answer
              if [[ "$answer" == "Y" ]]; then
                  mkvirtualenv "$venv"
              fi
          fi
      fi
  }