Activate venv with one-word command

Usage

Run vv anywhere down the directories hierarchy where there a venv around.

~ $ cd Projects/Superproject/Source/backend/
backend $ vv
Activated: /Users/Anatoly/Projects/Superproject/venv/bin/activate
(venv) backend $ ./manage.py runserver
...

Installation

Add this to your ~/.bashrc or ~/.zshrc:

function vv {
    D=`pwd`
    local FILE="venv/bin/activate"

    while [[ "$PWD" != "/" ]]
    do
        if [ -f $FILE ];
        then
            source $FILE
            echo "Activated: `pwd`/$FILE"
            cd $D
            return
        fi
        cd ..
    done
    echo "$FILE not found"
    cd $D
    return
}

Or add this to your ~/.config/fish/config.fish:

function vv
    set -l D (pwd)
    set -l FILE "venv/bin/activate.fish"

    while test "$PWD" != "/"
        if test -f $FILE
            source $FILE
            echo "Activated: "(pwd)/$FILE
            cd $D
            return
        end
        cd ..
    end
    echo "$FILE not found"
    cd $D
end