Re: [Rd] Front ends handling help.search() results?

From: Duncan Murdoch <murdoch.duncan_at_gmail.com>
Date: Wed, 03 Aug 2011 16:04:30 -0400

On 03/08/2011 1:23 PM, Thomas Friedrichsmeier wrote:
> On Wednesday 03 August 2011, Duncan Murdoch wrote:
> > I can't reproduce this. Can you get any more detail, e.g. by setting
> > options(error=recover) or similar?
>
> Interestingly, that does not start a browser, and options(error=dump.frames)
> appears to have no effect, either. geterrmessage() does list the error, though.
> I'm not sure whether that is or is not the expected handling of errors inside
> input handlers.
>
> Either way, I found I can trigger the error using
> tools:::httpd("/doc/html/Search", c(pattern = "grid"))
> debugging from there shows that the error is on line
> vignettes[i,]<- c(pkg, unlist(vignette[,c("File", "Title", "PDF", "R")]))
> At this point, "vignette" is:
> File Title PDF Depends Keywords
> 1 displaylist.Rnw Display Lists in grid displaylist.pdf graphics
> 2 displaylist.Snw Display Lists in grid displaylist.pdf graphics
> R
> 1 displaylist.R
> 2 displaylist.R
>
> > Vignettes listed twice sounds as
> > though you may have two copies of grid installed in your .libPath(), but
> > that shouldn't happen for a base package.
>
> It appears, the cause of the problem was failure to "make clean" every once in
> a while, and this resulted in installing both displaylist.Rnw and
> displaylist.Snw (into a single library location).

I've put a workaround for this into the help.search code, and a new check in the package install code to quit if you have a situation like this. For people working in R-devel this might cause builds to fail until you fix and re-install the bad packages.

Duncan Murdoch



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