clang-format feature request: Ability to break declaration parameters based on number of parameters

[robertankeney]

I would like to have the option in clang-format to always show one parameter per line for a function declaration. At present, when BinPackParameters is false and the function declaration exceeds the current ColumnLimit, this occurs. For example, for:
void myFunction(int param1, int param2, int param3, int param4, int param5, int param6, int param7)

If ColumnLimit is 80, clang-format will convert it to:

void myFunction(int param1,
                int param2,
                int param3,
                int param4,
                int param5,
                int param6,
                int param7)

Having the option to make this happen when you have more than X parameters (regardless of line length) would be a great step forward.

[llvmbot]

@llvm/issue-subscribers-clang-format

[mydeveloperday]

related #50393

[MangaD]

Why is this taking so long? :(

[HantaoPan]

I am still waiting...

[TheWiseNoob]

This would be lovely. :)

[garrdbyrd]

Bumping this

[EtienneBasilik]

I support this idea! It would indeed be logical to have e.g. maximum 3 parameters per line. If <= 3 (e.g. memcpy), I personally consider the code as more readable if the function call is on a single line. However, if there are more, then you are visually searching for the comma to get a glimpse of the number of arguments.
This feature would be needed both for function declaration and definition.