I have an alias for vi that runs vim instead — simply:
The problem was, aliases aren’t kept when running sudo (see man sudo and man sudoers).
So my natural tendency to write “sudo vi /etc/group” would end up calling vi, not vim — and I’d loose the syntax coloring I’ve fell in love with.
I’ve found some ugly work arounds over time, but after resetting my configuration after a reformat, I checked again and came across a beautiful alternative:
alias sudo='sudo '
Since the last character in the alias is a space, the next command is checked for alias expansion.
So now my
sudo vi /etc/group
sudo vim /etc/group
calling vim and my syntax coloring is restored.
Much thanks to shellperson.net for this one.
PS I say “sort of” because it will only work if your alias is the command immediately following sudo (which I expect most are).