Yes, that's where I started - the vignette says:
... Run arbtirary R code with @eval.
... the @eval tag. It evaluates code and treats the result as if it
was a literal roxygen tags. This makes it possible to eliminate
duplication by writing functions.
The first thing I noticed was that it does not say anything about delimiters.
By trial and error it seems to consider everything up to the next @... tag in
the header. Things that are not R code create an error during
devtools::document() processing. It seems the output is captured and processed,
i.e. System.time() creates a not-a-string error, but
as.character(System.time()) passes ... but then nothing appears in the .Rd -
and I haven't been able to find a single example of @eval in use in the wild.
No joy.
> On 2019-04-22, at 01:29, Jeff Newmiller <jdnew...@dcn.davis.ca.us> wrote:
>
> I have not used it... but did you read the vignette [1]? It sounds like it is
> a bit more meta than you think it is...
>
> [1] https://cran.r-project.org/web/packages/roxygen2/vignettes/rd.html
>
> On April 21, 2019 7:44:17 PM PDT, Boris Steipe <boris.ste...@utoronto.ca>
> wrote:
>> Playing with Roxygen features, but can't get @eval to work. E.g. ...
>>
>> #' @eval sprintf("%s", Sys.time())
>>
>> ... does not do what I thought it would (i.e. substitute the tag and
>> the expression with the string). Instead I see nothing in the .RD file.
>>
>> Any working examples out there?
>> Thanks!
>> Boris
>>
>> ______________________________________________
>> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide
>> http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>
> --
> Sent from my phone. Please excuse my brevity.
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