ESS for R
B.Rowlingson at lancaster.ac.uk
B.Rowlingson at lancaster.ac.uk
Tue Dec 19 17:43:47 CET 2000
> HOWEVER, you mentioned that what you wanted was the "default" function
> thing, i.e.
> dumped <- function { }
> placed into a non-existant buffer. This is a difference as far as how
> S-PLUS and R dump objects, I think. Your point, which I recall (I've
> not used S-PLUS for actual data analysis in a long time) is that this
> gets set for non-existant objects when using ESS for S-PLUS, and not
> for R, sounds familiar.
>
> I've CC'd ESS-help and R-help; can anyone verify this discrepancy
> (with ESS under S-PLUS and R)?
Its because the first thing Splus's dump(foo) function does is to write
"foo" <-
into the dump file. If the object doesn't exist, its not until that
point
that the dump stops, and you are left with '"foo" <-' in the file.
ESS uses this, and appends the ess-function-template to get
"foo" <- function( ) { }
in function ess-dump-file-other-window.
Since R gives you a zero-length file when you dump a non-existent
object,
ESS cant use this trick, and since ess-dump-file-other-window is only
passed the filename and not the object name it cant write it to the file
(unless it deparses the filename. Ick.).
I've rewritten ess-dump-file-other-window to take filename and object
as
argument. If it spots a new object (using the ess-dumped-missing-re as
before)
then it clears out the buffer and inserts "object" <-
(ess-function-template).
This works for Splus 5 and R 1.2.0. I don't have any of the other
systems that
ESS uses so I cant see if it breaks anything else.
One other related matter - if ess-function-template isn't formatted
exactly how
the pretty-formatter does it, then the buffer is reformatted and marked
as modified,
nullifying the (set-buffer-modified-p nil) in the dump function. Bug or
feature?
You decide.
Barry
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