On 01/02/2016 4:26 AM, Martin Maechler wrote:
"BH" == Bryan Hanson <han...@depauw.edu>
on Sun, 31 Jan 2016 09:50:46 -0500 writes:
BH> I think the 2nd option will be more palatable to
BH> inexperienced users, but both do state the important
BH> detail. Bryan
>> On Jan 30, 2016, at 4:11 PM, Duncan Murdoch <murdoch.dun...@gmail.com>
wrote:
>>
>> On OSX and Linux, the rgl package currently requires X11
>> libs to be available for linking. Recent versions of OSX
>> don't include them by default, so I'd like rgl to fail
>> nicely.
>>
>> Ideally, it will load a library that doesn't need to link
>> to the X11 libs but will still allow WebGL code to work,
>> but that's complicated, so I'd like a stopgap.
>>
>> I can detect that the failure is about to happen, and
>> call stop() in the .onLoad hook, but that gives an ugly
>> message:
>>
>> > library(rgl)
>> Error : .onLoad failed in loadNamespace() for 'rgl', details:
>> call: NULL
>> error: X11 not found; XQuartz (from www.xquartz.org) is required to run
rgl.
>> Error: package or namespace load failed for ‘rgl’
I agree that the error message is a bit messy or even ugly,
however, other than Bryan, I would want library(.) to signal
an error when it cannot provide a working package, loaded and
attached to search().
Other functions, such as require(.) do rely on this behavior of library(.),
e.g., the much used idiom
if(require(<some package>)) {
....
....
....
}
needs library() to signal an error on non-success.
Yes, that's a good point. That's what the version on R-forge currently
does.
Duncan Murdoch
Martin
>> Alternatively, I can just give a warning and not attempt to load the
rgl lib:
>>
>> > library(rgl)
>> Warning message:
>> X11 not found; XQuartz (from www.xquartz.org) is required to run rgl.
>>
>> rgl is now loaded, but it doesn't work; just about any function call
will give an error, e.g.
>>
>> > plot3d(1,2,3)
>> Error in rgl.cur() : object 'rgl_dev_getcurrent' not found
>>
>> Do people have opinions about this?
>>
>> One comparable package is RGtk2: if Gtk2 isn't install, it offers to
install it. I could probably do that for XQuartz. If the user says no, RGtk2 gives
really ugly error messages. rgl can work without XQuartz, but as I already
mentioned, making this work is complicated, so I'd like something simple for now.
>>
>> Duncan Murdoch
>>
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