clang-format, array initialisers

Question

In our project, we sometimes initialise arrays on one line, and sometimes we initialise them as blocks. That is

strings::UniChar const s[] = {'H', 'e', 'l', 'l', 'o'};

vs

strings::UniChar const s[] = 
{
  'H', 
  'e', 
  'l', 
  'l', 
  'o'
};

I would like to clang-format to be able to distinguish between the two types and not convert the second into the first one or align the elements after the opening brace. That is not like this:

strings::UniChar const s[] = {'H', 
                              'e', 
                              'l', 
                              'l', 
                              'o'};

Is there a way to achieve that using config files?

Answer 1

Adding a comma after the last array element causes clang-format (tried with v6.0.0) to align the elements to the left side, like your second example.

// With a trailing comma.
char buf[] = {
  'a',
  'b',
};

// Without a trailing comma.
char buf2[] = {'a', 'b'};