[ESS] paragraph filling in R scripts

[Dr. Alun Pope]

Thanks Tyler, for your quick response.  Yes, you have understood the
problem correctly and what you say about how auto-filling works (is it
ess or Emacs?) would certainly produce the behaviour I encountered.  I
shall wait a few days and then post a proper example when I have time to
search for a solution myself and if I haven't heard of a solution in the
meantime.

Thanks,

Alun

-----Original Message-----
From: ess-help-bounces at stat.math.ethz.ch
[mailto:ess-help-bounces at stat.math.ethz.ch] On Behalf Of Tyler William
Smith
Sent: Monday, 15 June 2009 5:29 AM
To: Dr. Alun Pope; ess-help at stat.math.ethz.ch
Subject: Re: [ESS] paragraph filling in R scripts

Dr. Alun Pope wrote: 

Thanks for looking at this.  I have not encountered the problem you
mention, but I have come across the following problem which is related.

Suppose I have a perfectly good expression such as this

very.long.meaningful.object.name[some.indexing.also.long,] <-
some.longish.expressions

When I tidy the code by end-delete-return on that line, the line appears
as:

very.long.meaningful.object.name[some.indexing.also.long,]
<- some.longish.expressions

Hi Alun,

I'm away from my computer at the moment, but I think this is a different
issue. If I understand you correctly, what you're seeing is the Emacs'
auto-filling breaking up an R statement in inappropriate places. As I
understand it, line-wrapping/filling functions just look for white space
beyond a specified column number, and use that to break your line into
two pieces. If that space happens to fall immediately before the <-
operator, you get a bad break. 

I suspect this is fixable, but the code I sent in my last message won't
help. I will poke around at this when I get a chance, unless wiser folk
have already got a solution.

Cheers,

Tyler

-----Original Message-----
From: ess-help-bounces at stat.math.ethz.ch
[mailto:ess-help-bounces at stat.math.ethz.ch] On Behalf Of tyler
Sent: Saturday, 13 June 2009 12:19 PM
To: ess-help at stat.math.ethz.ch
Subject: [ESS] paragraph filling in R scripts

Hi again,

Another bug from way back, this one reported for 5.3.6:

https://stat.ethz.ch/pipermail/ess-bugs/2007q4/000468.html

I fixed this with the following lines from my .emacs, but patching
essl-s.el would be cleaner.

(defun my-ess-mode-hook ()
  (setq paragraph-start
        (concat paragraph-start
                "\\|.*<-\\|\\s +\\(while\\|if\\|else\\|for\\)")))
(add-hook 'ess-mode-hook 'my-ess-mode-hook)

I haven't looked at this in ages, since my hook fixed the problem for
me. There may be better solutions, but this works fine for me.

Cheers,

Tyler

--
What is wanted is not the will to believe, but the will to find out,
which is the exact opposite.           --Bertrand Russell

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