I just noticed that this question has an answer on emacs.stackexchange that 
might be helpful:




On Sun, Sep 11, 2022, at 10:42 AM, Tyler Smith via ESS-help wrote:
> Hi,
> That's my tutorial, I'm glad it's been of some use! However, it's very 
> explicitly targeted at RMarkdown files (.rmd). The details will differ 
> for LaTeX (.Rnw files), although the general approach is quite similar. 
> I'll try to update it to cover both, but I haven't used .Rnw in a few 
> years now 
> Best,
> Tyler
> -- 
> plantarum.ca
> On Sun, Sep 11, 2022, at 10:24 AM, Stephen Bond via ESS-help wrote:
>> I am trying to help even though I know little:
>> I used the approach in 
>> https://plantarum.ca/2021/10/03/emacs-tutorial-rmarkdown/
>>> The main function you need for this is polymode-export, bound to M-n
>>> e.
>>> The first time you run this, you’ll be asked which exporter you would
>>> like to use. There are two choices, markdown and markdown-ess.
>> So, if you choose markdown it will ask for format and then you can type
>> pdf or html, it will weave and then look for pandoc. I have this in my
>> .emacs
>>  '(markdown-command
>>    (concat "pandoc" " --from=markdown --to=html" " --standalone --
>> mathjax --highlight-style=pygments"))
>> You can see that it ignores the to=html and asks me every time. It also
>> igonres the title section, where I specify the output format. So, it
>> looks like polymode does not know how to read the title/yaml, but that
>> is not a big deal as you can set that in the dialog after M-n e
>> Cheers
>> Stephen
>> On Wed, 2022-09-07 at 17:03 -0400, Vincent Goulet via ESS-help wrote:
>>> Hi all,
>>> A large part of my work in Emacs involves editing Sweave (.Rnw)
>>> files. I was very much used to the tried, tested and true ess-noweb
>>> mode for this purpose.
>>> Now, in the development version of ESS that is required for Emacs 28,
>>> all the noweb stuff was gutted out and we're told to use polymode
>>> instead. For one thing, I think it's a pity that such fundamental
>>> interaction between R and Emacs (wasn't the whole concept of Sweave
>>> based off Emacs functionality?) is no longer part of ESS. I'd
>>> certainly vote for the return of noweb files support. (I understand
>>> that polymode brought improved support for RMarkdown files.)
>>> I'm probably late to the party, but can anyone give me a primer on
>>> polymode for Rnw files? (Not Rmd files, some oldies like me still
>>> rely on LaTeX and Sweave -- not even knitr!)
>>> I followed the polymode installation instructions and added the
>>> 'mode: poly-noweb' file variable to a .Rnw file. If I do 'M-n w' or
>>> 'M-n e' (what's the difference?), I'm first asked to select a weaver
>>> or an exporter. What's the answer? Pressing TAB does not offer any
>>> choice.
>>> What if I just want to compile the LaTeX file? In Emacs 27, ESS was
>>> connected to AUCTeX and the weave step was integrated into the
>>> compilation step (C-c C-c). Anything as streamlined with polymode?
>>> I also stumble into the following issues. First, as soon as I try to
>>> do anything in a .Rnw file, I get these error messages:
>>> Error during redisplay: (internal--syntax-propertize 2) signaled
>>> (error "Variable binding depth exceeds max-specpdl-size")
>>> Error running timer ‘show-paren-function’: (error "internal--syntax-
>>> propertize did not move syntax-propertize--done")
>>> Second, I ended up a few times with the following markers at the end
>>> of the file name in the modeline and in the mode display: HeadTail.
>>> I'm not too sure how to reproduce, but does this ring any bell here?
>>> System info: 
>>> Emacs Modified for macOS 28.1-modified-1, based on
>>> GNU Emacs 28.1 (build 1, aarch64-apple-darwin21.1.0, NS appkit-
>>> 2113.00 Version 12.0.1 (Build 21A559)) of 2022-05-11
>>> polymode 0.2.2 installed through MELPA
>>> Thanks in advance!
>>> v.
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>>> ESS-help@r-project.org mailing list
>>> https://stat.ethz.ch/mailman/listinfo/ess-help
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