syntax: add a minus before a list of variables

Dear Stata users,

I want to make a convenient wrapper using gsort command. My question is how to add a minus before every variable in my varlist. Thank you.

Code:

program define gsort2
syntax varlist
gsort -`varlist' //NOT the right way, but use tokenize?
......

What I want to achieve is letting

Code:

gsort2 price weight mpg, EQUALS(=)
gsort -price -weight -mpg