[R-pkg-devel] Errors from Suggests or Enhances not in mainstream repositories

[Hadley Wickham]

On Tue, Jul 3, 2018 at 5:57 AM, Duncan Murdoch <murdoch.duncan using gmail.com> wrote:
> On 02/07/2018 6:13 PM, Ben Bolker wrote:
>>
>> I got something similar.  I have a few thoughts:
>>
>> (1) you should use  "if (require(citrus)) { ... }" in your examples;
>> "Suggests" and "Enhances" packages are supposed to be *optional*, i.e.
>> examples and tests should be able to run even if they're not installed
>
>
> Nowadays 'if (requireNamespace("citrus")) { ... }' would be preferred in
> tests and examples, along with a 'citrus::' prefix on the objects from that
> package that are needed.  This has milder side effects than `require()`.

And requireNamespace("citrus", quietly = TRUE) is even slightly better
since it avoids one more side-effect ;)

Hadley

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