R help - Mar 2012 - Nested brew call yields Error in .brew.cat(26, 28) : unused argument(s) (26, 28)

I am writing several webpages using the brew package and R2HTML. I would 
like to work off one script so I am using nested brew calls. The 
documentation for brew states that:

"NOTE: brew calls can be nested and rely on placing a function named 
?.brew.cat? in the environment in which it is passed. Each time brew is 
called, a check for the existence of this function is made. If it 
exists, then it is replaced with a new copy that is lexically scoped to 
the current brew frame. Once the brew call is done, the function is 
replaced with the previous function. The function is ?nally removed from 
the environment once all brew calls return."

I'm afraid I can't quite figure out what it is I'm supposed to do
here.
I've tried loading the brew library within the script which I pass to 
brew, and I've tried defining brew cat like this:

.brew.cat=function(){}

This generates the following error message:

Error in .brew.cat(26, 28) : unused argument(s) (26, 28)

I think perhaps it is more likely that I need to insert into the script 
the actual content of .brew.cat, but I can't seem to get R to tell me 
what it is and Googling throws up a lot of stuff about beer and not much 
else (drew a blank also from RSiteSearch("Nested brew"))

Any help gratefully received.

Chris Beeley
Institute of Mental Health, UK

On Wed, 2012-03-28 at 11:40 +0100, Chris Beeley wrote:
> I am writing several webpages using the brew package and R2HTML. I would 
> like to work off one script so I am using nested brew calls. The 
> documentation for brew states that:
> 
> "NOTE: brew calls can be nested and rely on placing a function named 
> ?.brew.cat? in the environment in which it is passed. Each time brew is 
> called, a check for the existence of this function is made. If it 
> exists, then it is replaced with a new copy that is lexically scoped to 
> the current brew frame. Once the brew call is done, the function is 
> replaced with the previous function. The function is ?nally removed from 
> the environment once all brew calls return."
> 
> I'm afraid I can't quite figure out what it is I'm supposed to
do here.
> I've tried loading the brew library within the script which I pass to 
> brew, and I've tried defining brew cat like this:
The paragraph above describes what brew is doing behind the scenes. It's
not necessary to modify or set the .brew.cat function.

A nested (or recursive) brew call occurs when brew() is called from a
document currently being processed by brew().

To illustrate further, suppose there are two brew documents,
example-1.brew and example-2.brew, where example-1.brew contains the
following text (delimited by '''):

'''
This text is in example-1.brew.
<%= brew::brew("example-2.brew") %>
'''

and the example-2.brew contains

'''
This text is in example-2.brew.
<%= date() -%>
'''

Then from the R prompt we have:

R>brew::brew("example-1.brew")
This text is in example-1.brew.
This text is in example-2.brew.
Thu Mar 29 20:24:52 2012
> .brew.cat=function(){}
> 
> This generates the following error message:
> 
> Error in .brew.cat(26, 28) : unused argument(s) (26, 28)
> 
> I think perhaps it is more likely that I need to insert into the script 
> the actual content of .brew.cat, but I can't seem to get R to tell me 
> what it is and Googling throws up a lot of stuff about beer and not much 
> else (drew a blank also from RSiteSearch("Nested brew"))
> 
> Any help gratefully received.
> 
> Chris Beeley
> Institute of Mental Health, UK
> 
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-- 
Matthew S. Shotwell
Assistant Professor, Department of Biostatistics
School of Medicine, Vanderbilt University
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