vim automatically indent comma exception

Question

VIM automatically indent the following code, .b = 2 line indentation looks very bad.

struct foo test(void) { 
    return (struct foo) {
           .a = 1,
                .b = 2,
    };
}

How can I change indentation settings so it would look like this?

struct foo test(void) {
    return (struct foo) {
         .a = 1,
         .b = 2,
    };
}

Answer 1

You need to set the cinoptions :

:set cino+=J1 

After that indent it with the command = (ex: indent all the file gg=G)