gistfile1.txt

case "$DE" in
    kde)
    open_kde "$url"
    ;;

    gnome3|cinnamon)
    open_gnome3 "$url"
    ;;

    gnome)
    open_gnome "$url"
    ;;

    mate)
    open_mate "$url"
    ;;

    xfce)
    open_xfce "$url"
    ;;

    lxde|lxqt)
    open_lxde "$url"
    ;;

    enlightenment)
    open_enlightenment "$url"
    ;;

    cygwin)
    open_cygwin "$url"
    ;;

    darwin)
    open_darwin "$url"
    ;;

    flatpak)
    open_flatpak "$url"
    ;;

    generic)
    open_generic "$url"
    ;;

[...]