[Rd] On implementing zero-overhead code reuse

[Kynn Jones]

@Konrad, you're right, that's exactly what I'm looking for.  That's
great stuff.  Thanks!  (And thanks also to Gabor Grothendieck, who
suggested modules to me way back.)


On Tue, Oct 4, 2016 at 7:07 AM, Konrad Rudolph
<konrad.rudolph+r-devel at gmail.com> wrote:
> Check out ‹klmr/modules› on Github (distinct from CRAN’s ‹modules›!). It
> looks pretty much exactly like what you want:
>
> https://github.com/klmr/modules
>
> It has an extensive README and vignette explaining the usage.
>
> Cheers,
> Konrad
>
> --
> Konrad Rudolph
> On Sun, 2 Oct 2016 at 18:31 Kynn Jones <kynnjo at gmail.com> wrote:
>>
>> I'm looking for a way to approximate the "zero-overhead" model of code
>> reuse available in languages like Python, Perl, etc.
>>
>> I've described this idea in more detail, and the motivation for this
>> question in an earlier post to R-help
>> (https://stat.ethz.ch/pipermail/r-help/2016-September/442174.html).
>>
>> (One of the responses I got advised that I post my question here instead.)
>>
>> The best I have so far is to configure my PROJ_R_LIB environment
>> variable to point to the directory with my shared code, and put a
>> function like the following in my .Rprofile file:
>>
>>     import <- function(name){
>>         ## usage:
>>         ## import("foo")
>>         ## foo$bar()
>>         path <- file.path(Sys.getenv("PROJ_R_LIB"),paste0(name,".R"))
>>         if(!file.exists(path)) stop('file "',path,'" does not exist')
>>         mod <- new.env()
>>         source(path,local=mod)
>>         list2env(setNames(list(mod),list(name)),envir=parent.frame())
>>         invisible()
>>     }
>>
>> (NB: the idea above is an elaboration of the one I showed in my first
>> post.)
>>
>> But this is very much of an R noob's solution.  I figure there may
>> already be more solid ways to achieve "zero-overhead" code reuse.
>>
>> I would appreciate any suggestions/critiques/pointers/comments.
>>
>> TIA!
>>
>> kj
>>
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