[ESS] Freezing upon pasting into XEmacs running R

[Stephen Eglen]

i see the same problem as documented below, namely:

> options(continue = "   ")

and then pasting C-y a multi-line expression into *R* causes the
session to hang.  C-g seems to find it hard to break out of this one.

The problem seems to be that by changing "continue" to just spaces,
the secondary prompt effectively disappears.  ESS has the following
variable:

(defcustom inferior-ess-secondary-prompt "+ ?"
  "Regular expression used by ess-mode to detect the secondary prompt.
(This is issued by S to continue an incomplete expression). Do not
anchor to bol with `^'."
  :group 'ess-proc
  :type 'string)


This variable is used to construct inferior-ess-prompt.

So, to be safe, it is best not to change the continue option for R!
If you do change it, you'll then need to change 
     (inferior-ess-secondary-prompt	. "+ ?")

in R-customize-alist (defined in essd-r.el).

Stephen

Stephen Weigand writes:
 > Dear List,
 > 
 > I seem to have found a solution to this issue:
 > 
 > > Date: Wed, 8 Mar 2006 09:06:05 -0600 (CST)
 > > From: Stephen Weigand <Weigand.Stephen at mayo.edu>
 > > Subject: Re: [ESS] Freezing upon  pasting into XEmacs running R
 > > To: rsparapa at mcw.edu, ess-help at stat.math.ethz.ch
 > > 
 > > > Date: Wed, 08 Mar 2006 08:54:07 -0600
 > > > From: Rodney Sparapani <rsparapa at mcw.edu>
 > > 
 > > > >I'm running XEmacs 21.4 (patch 16), ESS version 5.2.7,
 > > > >and R 2.2.1 on SPARC Solaris 2.9.
 > > > >
 > > > >When I start an R session within XEmacs, and then
 > > > >paste a multi-line expression as simple as
 > > > >
 > > > >a <- function(x, y)
 > > > >  return(x + y)
 > > > >  
 > > > >into the R session, the XEmacs screen freezes
 > > > >and doesn't evaluate the expression.
 > > 
 > > [...]
 > > 
 > > > Hi Stephen:
 > > > 
 > > > The version of xemacs that you are using has been withdrawn.
 > > > The bugginess is somewhat similar to what you describe; see
 > > > http://ftp.xemacs.org/pub/xemacs/stable/README-21.4.16
 > > > 
 > > > Does the problem also exist with the latest stable version 
 > > > of xemacs? How about with the latest stable version of ESS?
 > > > 
 > > > Rodney
 > > 
 > > Thank you for this information! Looks like updating the
 > > installation is the obvious next step. 
 > > 
 > > Stephen
 > 
 > After updating to Xemacs 21.4.19 (but still using ESS 5.2.7) 
 > the problem persisted
 > 
 > But by chance I lost my .Rprofile and I could once again
 > paste a multi-line expression into ESS running R.
 > 
 > It appears to me that the problem is due to setting the 'continue'
 > option as in
 > 
 > options(continue = "  ") 
 > 
 > It doesn't seem to matter what 'continue' is set to (or 
 > whether it is set in .Rprofile or manually), at least
 > on my installation. In a Google search I didn't find this
 > issue coming up before, but I may have missed it. 
 > 
 > Thank you,
 > 
 > Stephen
 > 
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