Changing width.cutoff for tidy=T

[Joe]

Is there a way to change the width.cutoff for chunks where tidy=T? I'd like the width.cutoff to be wider. I tried setting this output hook, but it didn't work.

<<hooks, echo = F,cache=F>>=

  knit_hooks$set(

  source = function(x,options){

    if(options$tidy){

      return(tidy.source(text = x, width.cutoff = 0.9*getOption("width")))

    }

  }

@

Thanks!

-Joe

[Yihui Xie]

If you want an individual width for a chunk, the answer is no, there
is not such an option at the chunk level. The width can only be set at
the global level as options(width = ...), so you have at best this
solution for the time being:

<<>>=
options(width = 50)
<<real-chunk>>=
# R code here
<<>>=
options(width = 75)
@

If you want a global width, it will be much easier; just set it in
your first chunk.

BTW, note there was a change in the formatR package, on which this
functionality is based
(http://cran.r-project.org/web/packages/formatR/NEWS):

o the default value of the 'width.cutoff' argument in tidy.source()
is getOption('width') now; in the past it was 75% of that width
which was less intuitive

Regards,
Yihui
--
Yihui Xie <xiey...@gmail.com>
Phone: 515-294-2465 Web: http://yihui.name
Department of Statistics, Iowa State University
2215 Snedecor Hall, Ames, IA

[Joe]

Updating formatR did the trick for me, thanks!

[Yihui Xie]

Unfortunately, no, formatR cannot break a character string into
several lines. I know that is a little bit annoying. One workaround is
to manually break that string into shorter pieces and paste() them
together.

Regards,
Yihui
--
Yihui Xie <xiey...@gmail.com>
Phone: 515-294-2465 Web: http://yihui.name
Department of Statistics, Iowa State University
2215 Snedecor Hall, Ames, IA

On Sat, Aug 11, 2012 at 4:08 AM, Roger Close <roger...@gmail.com> wrote:
> Hi Yihui,
> I find that code sometimes still goes off the edge of the page regardless of
> what width= is set to be, usually if it's a long string in quotation marks.
> I can fix things up by rearranging the order of arguments in the code, but
> is there a way to (for example) automatically force each argument onto a new
> line if it when using tidy=TRUE?
> Thanks,
> Roger