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function workon --description 'Activate Python virtual environment'
    set -g VIRTUALENV_HOME $HOME/Virtualenvs

    if [ (count $argv) -lt 1 ]
        echo "You need to specify a virtualenv."
        eval cd $VIRTUALENV_HOME
        eval ls -d */
        return 1
    end

    if not [ -d $VIRTUALENV_HOME/$argv[1] ]
        echo "The virtualenv $argv[1] does not exist."
        echo "You can create it with virtualenv [name]."
        return 2
    end

    if set -q VIRTUAL_ENV
        eval deactivate
    end

    set -gx VIRTUAL_ENV $VIRTUALENV_HOME/$argv[1]

    eval cd $VIRTUALENV_HOME/$argv[1]
    eval . bin/activate.fish

    echo -e "Activated virtual environment '$VIRTUAL_ENV' ...\n"
end

function stopworkon --description 'Deactivate current virtual environment'
    if set -q VIRTUAL_ENV
        echo -e "Deactivated virtual environment '$VIRTUAL_ENV'.\n"
    end

    eval deactivate

    set -e VIRTUAL_ENV
end