workon is a bash completion function

workon.sh

workon is a function
workon () 
{ 
    typeset -a in_args;
    typeset -a out_args;
    in_args=("$@");
    if [ -n "$ZSH_VERSION" ]; then
        i=1;
        tst="-le";
    else
        i=0;
        tst="-lt";
    fi;
    typeset cd_after_activate=$VIRTUALENVWRAPPER_WORKON_CD;
    while [ $i $tst $# ]; do
        a="${in_args[$i]}";
        case "$a" in 
            -h | --help)
                virtualenvwrapper_workon_help;
                return 0
            ;;
            -n | --no-cd)
                cd_after_activate=0
            ;;
            -c | --cd)
                cd_after_activate=1
            ;;
            *)
                if [ ${#out_args} -gt 0 ]; then
                    out_args=("${out_args[@]-}" "$a");
                else
                    out_args=("$a");
                fi
            ;;
        esac;
        i=$(( $i + 1 ));
    done;
    set -- "${out_args[@]}";
    typeset env_name="$1";
    if [ "$env_name" = "" ]; then
        lsvirtualenv -b;
        return 1;
    else
        if [ "$env_name" = "." ]; then
            IFS='%';
            env_name="$(basename $(pwd))";
            unset IFS;
        fi;
    fi;
    virtualenvwrapper_verify_workon_home || return 1;
    virtualenvwrapper_verify_workon_environment "$env_name" || return 1;
    activate="$WORKON_HOME/$env_name/$VIRTUALENVWRAPPER_ENV_BIN_DIR/activate";
    if [ ! -f "$activate" ]; then
        echo "ERROR: Environment '$WORKON_HOME/$env_name' does not contain an activate script." 1>&2;
        return 1;
    fi;
    type deactivate > /dev/null 2>&1;
    if [ $? -eq 0 ]; then
        type deactivate | grep --color=auto 'typeset env_postdeactivate_hook' > /dev/null 2>&1;
        if [ $? -eq 0 ]; then
            deactivate;
            unset -f deactivate > /dev/null 2>&1;
        fi;
    fi;
    virtualenvwrapper_run_hook "pre_activate" "$env_name";
    source "$activate";
    virtualenvwrapper_original_deactivate=`typeset -f deactivate | sed 's/deactivate/virtualenv_deactivate/g'`;
    eval "$virtualenvwrapper_original_deactivate";
    unset -f deactivate > /dev/null 2>&1;
    eval 'deactivate () {
        typeset env_postdeactivate_hook
        typeset old_env

        # Call the local hook before the global so we can undo
        # any settings made by the local postactivate first.
        virtualenvwrapper_run_hook "pre_deactivate"

        env_postdeactivate_hook="$VIRTUAL_ENV/$VIRTUALENVWRAPPER_ENV_BIN_DIR/postdeactivate"
        old_env=$(basename "$VIRTUAL_ENV")

        # Call the original function.
        virtualenv_deactivate $1

        virtualenvwrapper_run_hook "post_deactivate" "$old_env"

        if [ ! "$1" = "nondestructive" ]
        then
            # Remove this function
            unset -f virtualenv_deactivate >/dev/null 2>&1
            unset -f deactivate >/dev/null 2>&1
        fi

    }';
    VIRTUALENVWRAPPER_PROJECT_CD=$cd_after_activate virtualenvwrapper_run_hook "post_activate";
    return 0
}