[ESS] Finding 64-bit R versions on Windows
Stephen Eglen
S.J.Eglen at damtp.cam.ac.uk
Wed Jul 9 13:09:09 CEST 2014
hi Kevin,
I think we could add something like this, but as I'm not on Windows, we
might need some help testing it (+ Rich?). On unix we already have "M-x
R-newest"; what does that do for you on Windows?
Perhaps on the mac we also have the choice of 64 or 32 bit? In which
case we could have a variable like
(defcustom ess-prefer-64bit t)
to allow us to set a preference for 64 bit.
Some help with elisp below:
> ;; This hack finds the latest 64-bit version.
> (defun R64 (&optional start-args)
> "Call the latest 64-bit version of R"
> (interactive "P")
> ;; sweep through the list of R-version commands
> ;; to find the 64-bit ones
> (defun m64 (target)
> "remove string '-64bit' from target"
> (if (string-match "-64bit" target)
> (replace-match "" t t target)
> ))
if you have an (if ) with no else portion, as you do here, just rewrite
it as:
(when (string-match "-64bit" target)
(replace-match "" t t target))
> ;; now use the newest version that matches a 64-bit version
> (defun krc-in-newest (source)
> (if source
> (if (string-match source ess-newest-R)
> (concat source "-64bit")
> nil)
> nil))
that can probably be simplified:
(when (and source (string-match source ess-newest-R))
(concat source "-64bit"))
all untested though of course!
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