Add support option for all graphics front-end

[kuboosoft]

Hi, I love your work, why no include a option for people as want use packer in a visual front-end ?. I would like an option that the user could invoke su or sudo; with zenity, gksu or another.

Example:
zenity --password | su -c "$(printf '%q ' "$@")"

elif zenity --password | sudo -S -v &>/dev/null && sudo -l "$@" &>/dev/null; then
sudo -E "$@"

or

gksu "$(printf '%q ' "$@")"

elif gksu sudo -S -v &>/dev/null && sudo -l "$@" &>/dev/null; then
sudo -E "$@"
////////////////////////
# Called whenever anything needs to be run as root ($@ is the command)
runasroot() {
if [[ $UID -eq 0 ]]; then
"$@"

elif sudo -v &>/dev/null && sudo -l "$@" &>/dev/null; then

elif zenity --password | sudo -S -v &>/dev/null && sudo -l "$@" &>/dev/null; then
sudo -E "$@"
else
echo -n "root "

su -c "$(printf '%q ' "$@")"

zenity --password | su -c "$(printf '%q ' "$@")"
fi
}
///////////////////////////////
Thanks :)