[Rd] On implementing zero-overhead code reuse

[Gabor Grothendieck]

Have a look at the CRAN modules package and the import package.

On Sun, Oct 2, 2016 at 1:29 PM, 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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