This is how to look up the filename. The first "sp" is the topic name, the second is the package name.
> help("sp", "sp")[[1]] [1] "C:/Users/csard/R/win-library/4.0/sp/help/00sp" So you need to link to the "00sp.Rd" file: \link[sp:00sp]{sp} Gabor On Tue, Jun 16, 2020 at 9:09 PM Wayne Oldford <rwoldf...@uwaterloo.ca> wrote: > > Hi > > I got caught by this new test this week in trying to push an updated release > of the loon package to CRAN. > > By following this thread, I corrected my cross-references to external > packages but I got stymied by > the one I hoped to give to the "sp" package for Spatial data > > _________ > > Here is the history: > > I tried > \link[sp:sp]{sp} > which failed here: > Debian: > <https://win-builder.r-project.org/incoming_pretest/loon_1.3.1_20200616_162128/Debian/00check.log> > Status: 1 WARNING > > > That was meant to correct an earlier attempt (it did for other links to > "scales" for example) where I had tried > \link[sp]{sp} > and failed here: > Debian: > <https://win-builder.r-project.org/incoming_pretest/loon_1.3.1_20200615_213749/Debian/00check.log> > Status: 1 WARNING > > > So to complete the possibilities as I understand them, I just now tried > \link{sp} > which, as might be expected, failed here: > Debian: > <https://win-builder.r-project.org/incoming_pretest/loon_1.3.1_20200616_213921/Debian/00check.log> > Status: 1 WARNING > As expected, error here was different: "Missing link" as opposed to > "Non-file package-anchored link" > > _________ > > > I am not sure whether I have missed a subtlety in WRE or that the peculiar > circumstance > where the package, the topic, and the file name are all identical (sp) is > some weird boundary case. > > Without further advice, I think I am just going to remove the link to "sp". > It really is just a courtesy link to the package description for "sp". > > Thanks in advance for your thoughts. > > Wayne > > > > > -----Original Message----- > From: R-package-devel <r-package-devel-boun...@r-project.org> on behalf of > Georgi Boshnakov <georgi.boshna...@manchester.ac.uk> > Date: Tuesday, June 16, 2020 at 9:27 AM > To: Gábor Csárdi <csardi.ga...@gmail.com>, Duncan Murdoch > <murdoch.dun...@gmail.com> > Cc: List r-package-devel <r-package-devel@r-project.org> > Subject: Re: [R-pkg-devel] check cross-references error: Non-file > package-anchored link(s) > > I think that the current behaviour is documented in WRE: > > "...There are two other forms of optional argument specified as > \link[pkg]{foo} and > \link[pkg:bar]{foo} to link to the package pkg, to files foo.html and > bar.html respectively. > These are rarely needed, perhaps to refer to not-yet-installed packages > (but there the HTML > help system will resolve the link at run time) or in the normally > undesirable event that more > than one package offers help on a topic7 (in which case the present > package has precedence so > this is only needed to refer to other packages). They are currently only > used in HTML help > (and ignored for hyperlinks in LATEX conversions of help pages), and link > to the file rather > than the topic (since there is no way to know which topics are in which > files in an uninstalled > package) ... Because they have been frequently misused, the HTML help > system looks for topic foo in package pkg > if it does not find file foo.html." > > Unless I am missing something, it seems that it would be relatively > painless to reverse the logic of the current behaviour of the help system, > i.e. to start looking first for the topic and then for a file. > > Georgi Boshnakov > > -----Original Message----- > From: R-package-devel <r-package-devel-boun...@r-project.org> On Behalf > Of Gábor Csárdi > Sent: 16 June 2020 13:44 > To: Duncan Murdoch <murdoch.dun...@gmail.com> > Cc: List r-package-devel <r-package-devel@r-project.org> > Subject: Re: [R-pkg-devel] check cross-references error: Non-file > package-anchored link(s) > > On Mon, Jun 15, 2020 at 5:30 PM Duncan Murdoch <murdoch.dun...@gmail.com> > wrote: > > > > On 15/06/2020 12:05 p.m., Martin Maechler wrote: > > >>>>>> Duncan Murdoch on Sun, 14 Jun 2020 07:28:03 -0400 writes: > > > > > > > I agree with almost everything you wrote, except one thing: > this isn't > > > > newly enforced, it has been enforced since the help system > began. What > > > > I think is new is that there are now tests for it. Previously > those > > > > links just wouldn't work. > > > > > > > Duncan Murdoch > > > > > > Yes, to all... including Duncan's agreement with Gábor. > > > > > > Also, Duncan M earlier did mention that he had wanted to > > > *change* the link-to-file behavior for these cases (when he wrote > > > most of the Rd2html source code) but somehow did not get it. > > > > Actually, I don't think I pushed for this change at the time (or at > > least I didn't push much). I just wish now that I had, because I > > think it will be harder to do it now than it would have been then. > > > > Duncan > > I am not entirely sure, but maybe just documenting the current behaviour > and undoing 78674 could work. With some tweaks? E.g. > > * updating R-exts to say that \link[pkg:topic]{text} will link to > `topic.html` in `pkg` first (for historical reasons), and falls back to > searching for `topic` in `pkg` at render time. > * updating Rd2HTML to look for the topic and use it in the link, instead > of throwing a warning, in it cannot find `topic.html` > * removing the `R CMD check` warning for non-file links, that was added > in 78674 :) > > Is there anything else? > > Gabor > > [...] > > ______________________________________________ > R-package-devel@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-package-devel > ______________________________________________ > R-package-devel@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-package-devel > > > ______________________________________________ > R-package-devel@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-package-devel ______________________________________________ R-package-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-package-devel