[R-pkg-devel] How do I enable to show data in inst/extdata in data() || lazy load

[Uwe Ligges]

On 20.12.2022 00:58, Sanjeev Sariya wrote:
> Hi,
> thank you for the reply.
> 
> Do you need this to be a file? Could it be a pre-parsed R object
> instead?

Yes, and that can go into an .RData file.

Best,
Uwe Ligges

> 
> I need to provide an external data/file in the R package. This has come as
> a request from F1000 journal editors.
> 
> One way to solve this could be to write a script that imports the file
> from inst/extdata using the facilities provided by your package and put
> it in a file under data/, then document the resulting object.
> 
> 
> What do you call this step? How do I do this?
> I thought to loading the file as lazyload, .onload package something?
> 
> Best,
> --
> Sanjeev M
> 
> 
> 
> 
> On Tue, Dec 20, 2022 at 1:55 AM Ivan Krylov <krylov.r00t using gmail.com> wrote:
> 
>> On Mon, 19 Dec 2022 20:59:27 +0530
>> Sanjeev Sariya <sanjeevsariya using gmail.com> wrote:
>>
>>> ... I have created a .Rd file.
>>> I'm interested in listing this file in data() ...
>>
>> My understanding is that data() is for R-level objects, and so is
>> help(), most likely.
>>
>> One way to solve this could be to write a script that imports the file
>> from inst/extdata using the facilities provided by your package and put
>> it in a file under data/, then document the resulting object. I think
>> that if you build your package with --no-resave-data, it will remain an
>> R script that will be run during the data() call. (By default, your R
>> script will be run during R CMD build and its output will be packaged
>> into a gzip-compressed RData file.)
>>
>> This might go against the guidance at
>> <https://cran.r-project.org/doc/manuals/R-exts.html#Data-in-packages>,
>> which says:
>>
>>>> R code should be if possible “self-sufficient” and not make use of
>>>> extra functionality provided by the package, so that the data file
>>>> can also be used without having to load the package or its namespace
>>
>> Do you need this to be a file? Could it be a pre-parsed R object
>> instead?
>>
>> --
>> Best regards,
>> Ivan
>>
> 
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> 
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