function virtualenv_prompt_info(){
  [[ -n ${VIRTUAL_ENV} ]] || return
  echo "${ZSH_THEME_VIRTUALENV_PREFIX:=[}${VIRTUAL_ENV:t}${ZSH_THEME_VIRTUALENV_SUFFIX:=]}"
}

# disables prompt mangling in virtual_env/bin/activate
export VIRTUAL_ENV_DISABLE_PROMPT=1

alias activate='source $(find . -maxdepth 3 -name "activate") 2> /dev/null || echo "No virtualenv detected"'