Evgeny Egorochkin wrote:
> Hi,
>
> When handling optional deps, there's often a pattern similar to:
>
> {..., depSupport ? false, dep ? null }:
> assert depSupport -> dep != null ;
> ......
> buildInputs = [...]
> ++ stdenv.lib.optional depSupport dep
>
> I propose to add a standard function like this:
>
> optionalInput =
> cond: elem: assert cond -> elem != null; if cond then [elem] else [];
cond: elem: if cond the assert elem != null; [elem] else [];
But I prefer to pass non-null anyway, and use
buildInputs = if cond then [elem] else [];
>
> This removes a good deal of asserts clutter and is easy enough to use so
> that maintainers will actually specify asserts as a byproduct instead of
> letting things fail at buildtime or silently not compile in the needed
> functionality.
>
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