Direnv .envrc for Python Virtualenv

.envrc

# direnv file: https://github.com/direnv/direnv
#   Automatically sets the gopath to the directory wherever this .envrc
#   file lives, even from subdirectories

OLD_PYTHON=`which python`
VENV_PATH=`pwd`/.venv/`hostname`

if [ ! -d "$VENV_PATH" ]; then
   virtualenv $VENV_PATH
fi

source $VENV_PATH/bin/activate
NEW_PYTHON=`which python`

if [ "$OLD_PYTHON" != "$NEW_PYTHON" ]; then # don't quote the variables, to strip the newline
   echo "Virtualenv changed"
   echo "  from $OLD_PYTHON"
   echo "  to   $NEW_PYTHON"
fi