[ESS] Developing R packages under ESS

[Richard M. Heiberger]

normally, it just works.  Do you have a recent ESS?  Try turning off
your .emacs and see if that helps.

When you open .R files from a package, ESS knows about the package.
When you C-c C-c revised files
they go into the package namespace.

On Wed, Mar 7, 2018 at 8:28 PM, Boylan, Ross <Ross.Boylan using ucsf.edu> wrote:
> Can anyone suggest to me a good way to develop R packages with ESS?  "good" here means that I  can debug the code and make changes to the code without rebuilding the whole package.
>
> So far I've tried a bunch of different approaches, but none has quite worked.
>
> 1. When I had an old (or even new) version of the package in the standard load paths I tended to get "namespace is locked" errors when I modified the code and attempted to read it in.  So I deleted the installation in the standard path.
>
> 2. Wrote a script that sourced all the .R files.  But when I change them and reload in ESS I get the error "unable to load <mylibrary>", even if I do C-c C-t C-s to turn off the namespace.  I suspected the problem might have been from evaluating vignette code in an .rnw file, but even if I copied and pasted it into the the main *R* buffer I still get the problem:
>  Loading required package: LazarSim
>  Error in .requirePackage(package) (from SimParameters.R#35) :
>    unable to find required package ‘LazarSim’
>  In addition: Warning message:
>  In library(package, lib.loc = lib.loc, character.only = TRUE, logical.return = TRUE,  :
>    there is no package called ‘LazarSim’
> BTW, that error happened after I attempted to execute some code from the package, not when I issued any load/library/require type command.
>
> R is running in the directory above the package directory.
> Grep confirms my recollection that I don't have code that does require().
> Maybe R overrides the basic code for sourcing files?  My test file uses source() to load the source files, which are in the package directory.
>
> Thanks for any help.
> Ross
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