handle_virtualenv

export PREVPWD=`pwd`
export PREVENV_PATH=

handle_virtualenv(){
    if [ "$PWD" != "$PREVPWD" ]; then
        PREVPWD="$PWD";
        if [ -n "$PREVENV_PATH" ]; then
            if [ "`echo "$PWD" | grep -c $PREVENV_PATH`" = "0"  ]; then
                deactivate
                PREVENV_PATH=
            fi
        fi

        if [ -e "$PWD/bin/activate" ] && [ "$PWD" != "$PREVENV_PATH" ]; then
            PREVENV_PATH="$PWD"
            source $PWD/bin/activate
        fi
    fi
}

export PROMPT_COMMAND=handle_virtualenv