[ESS] Integration of pandoc using polymode+knitr

[Mathieu Basille]

Dear Ahmadou,

As far as I can tell, the approach is not a lot different than the 'pandoc' 
function from knitr. For instance, you can specify to knitr the pandoc 
options, or a file where to look for these options, or as a chunk embedded 
in the main file. Basically, pandoc from knitr is a mere wrapper to a 
system call to 'pandoc'. See: http://yihui.name/knitr/demo/pandoc/

In the end, my issue is not really what function to use (pandoc from knitr, 
render from rmarkdown, ...), but how to use it from Emacs + polymode + ESS. 
Which I couldn't do so far.

However, thinking a little bit more about it, maybe my approach of the 
whole problem is wrong, and instead of using a R function, I should try to 
have a direct Lisp call to pandoc from within Emacs? Once again, I'm stuck 
with my very limited Lisp skills... Any help on this appreciated!

Sincerely,
Mathieu.


Le 03/10/2014 01:15 PM, Ahmadou Dicko a écrit :
> Why not simply build ess-swv-pandoc on top of  the new rmarkdown
> <http://rmarkdown.rstudio.com/> package <https://github.com/rstudio/rmarkdown>.
>
> You example will  be :
>
> library(rmarkdown)
> render("test.Rmd <http://test.md>", html_document())
>
> There are a lot of advantages with this approach, for example you can
> specify all pandoc options using a Yaml header in the .Rmd file.
>
>
>
>
> On Mon, Mar 10, 2014 at 3:53 PM, Mathieu Basille
> <basille.web at ase-research.org <mailto:basille.web at ase-research.org>> wrote:
>
>     Dear list,
>
>     As a happy user of Emacs+ESS for years, I happily welcomed the new
>     polymode, most notably to edit .Rmd (R Markdown) documents. It's very
>     easy to weave the file, e.g. using M-n s (ess-swv-weave), with knitr
>     defined as the ess-swv-processor.
>
>     Personally, I also added M-n s as the shortcut for ess-swv-weave in
>     polymode-mode-map:
>
>     (define-key polymode-mode-map "\M-ns" 'ess-swv-weave)
>
>     Maybe not the cleanest approach, but it allows to weave from anywhere
>     in the document.
>
>     Now, I'd like to integrate the use of pandoc after the .Rmd has been
>     weaved. A typical workflow in R would be:
>
>     library(knitr)
>     knit("test.Rmd")
>     pandoc("test.md <http://test.md>", format = "html")
>
>     While the first step (knit) is perfectly handled by ess-swv-weave, I
>     don't know any solution for the second part. I thus tried to mimic
>     different functions from ESS, to no avail because of my virtually NULL
>     skills of Lisp programming. The closest I could come was:
>
>     (defun ess-swv-pandoc
>        "Run Pandoc on the associated .md file."
>        (let* ((rmd-buf (current-buffer)))
>          (save-excursion
>            (let* ((sprocess (ess-get-process ess-current-process-name))
>                   (sbuffer (process-buffer sprocess))
>                   (md-file (buffer-file-name))
>                   (buf-coding (symbol-name buffer-file-coding-system))
>                   (pandoc-cmd
>                    (format "require(knitr); pandoc(%s.md <http://s.md>,
>     output = \"html\")" md-file)))
>              (message "Running pandoc on %s.md <http://s.md>" md-file)
>              (ess-execute pandoc-cmd 'buffer nil nil)
>              (switch-to-buffer rmd-buf)
>              (ess-show-buffer (buffer-name sbuffer) nil)))))
>
>     This attempt miserably fails with: "Wrong type argument: commandp,
>     ess-swv-pandoc", and this is where I am stuck.
>
>     I'd appreciate if a good soul could shed some light on this!
>
>     All the best,
>     Mathieu Basille.
>
>
>     --
>
>     ~$ whoami
>     Mathieu Basille, PhD
>
>     ~$ locate --details
>     University of Florida \\
>     Fort Lauderdale Research and Education Center
>     (+1) 954-577-6314
>     http://ase-research.org/__basille <http://ase-research.org/basille>
>
>     ~$ fortune
>     « Le tout est de tout dire, et je manque de mots
>     Et je manque de temps, et je manque d'audace. »
>       -- Paul Éluard
>
>     ________________________________________________
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>
>
>
>
> --
> Ahmadou H. DICKO
> statistician economist (Ingénieur Statisticien Économiste)
> PhD candidate in Climate change economics
> Faculty of economics and managment - Cheikh Anta Diop University
> West African Science Service Center on Climate Change and Adaptated Land
> Use (WASCAL)
> Center for Development Research (ZEF) - University of Bonn
> email : ahmadou.dicko at ucad.edu.sn <mailto:ahmadou.dicko at ucad.edu.sn>
> twitter : @dickoah
> github : github/dickoa <https://github.com/dickoa>
> tel : +221 33 827 55 16
> portable: +221 77 123 81 69

-- 

~$ whoami
Mathieu Basille, PhD

~$ locate --details
University of Florida \\
Fort Lauderdale Research and Education Center
(+1) 954-577-6314
http://ase-research.org/basille

~$ fortune
« Le tout est de tout dire, et je manque de mots
Et je manque de temps, et je manque d'audace. »
  -- Paul Éluard