[Rd] relative path to source files in vignette

[Gabor Grothendieck]

See ?system.file with the package= argument.

On Fri, Oct 10, 2008 at 2:19 PM, Peter Ruckdeschel
<peter.ruckdeschel at web.de> wrote:
> Hi,
>
> this may be slightly off-topic, but as you are the experts:
>
> we have written a small vignette, in which we want to refer to
> .R, .Rd source files by means of relative paths.
>
> More specifically, we want to use TeX package "listings" to include
> source code,
>
> [which btw in the mean time works pretty well together with "fancyvrb"
> so can be used
>  with Sweave without problems...]
>
> To avoid redundancy we would like to use
>
>  \lstinputlisting[firstline=<n1>,lastline=<n2>]{<r-source-file.R>}
>
> and to do so we somehow need path information.
>
> This is /not/ a "listings" issue, as we might also have used
>   \input{<r-source-file.R>}, only is \lstinputlisting a bit more
> flexible...
>
> Using relative paths, i.e. as the vignette resides in subfolder "inst/doc"
> something like
>
>     ../../../<mypkg>/R/<myR.R>    or   ../../../<mypkg>/man/<myRd.Rd>
>
> does the job for  both  R CMD build   and   R CMD check ,
> --- in standard configurations.
>
> However, as you may change the location of the check folder with
> the -o option of R CMD check, (and possibly other things, we have
> not yet thought of ...), our solution is not quite satisfactory,
> so we have been wondering whether there is a (platform-independent)
> way to access the package source folder (under check) from within
> TeX.
>
> --- or if you prefer to solve it from R-side:
>
> We would appreciate an Sweave-chunk to do the following:
> +have three arguments firstline, lastline, filename
>  [where filename is relative to the package source folder]
> +read out the information about the path to the package
>  source folder [from the env-variable?]
> +with this information read in the part of the source file
>  between <firstline> and <lastline>
>  and places this content ---without wrapping it to
>  \begin{Schunk} ... \end{Schunk}--- into the .tex file
>  ---preferrably  already into a \begin{listing}\end{listing}
>   environment...
>
> Any suggestions how to resolve this?
>
> Thank you already,
> Peter
>
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