Re: org-in-org

["Berry, Charles" via "General discussions about Org-mode." <emacs-orgmode@gnu.org>]

Greg, 

See inline

> On Feb 23, 2021, at 6:24 AM, Greg Minshall <minshall@umich.edu> wrote:
> 
> i have a question about org-in-org source blocks.  i volunteered to help
> in an effort to provide a tutorial of using the ESS (Emacs Speaks
> Statistics) package for R, in particular, from org mode.
> 
> i'd like to write my contribution as a .org file.  i'd like to include
> fragments of org code, including source blocks (in R).  and, i'd like to
> show various result types.  so, i'd like to be able to have the
> #+RESULTS show up in the org-in-org source block as exported inside the
> containing .org file.

I think I get your intention. You want the visual to look like it would if the src-edit buffer was opened in emacs as org.

> 
> and, i'd like to trigger all this from a makefile, using some emacs
> batch script to export the containing .org file into a .html or .pdf
> file.
> 
> (i *think*) what i would like to end up with is what it would like if i
> had manually opened the org-in-org source blocks (C-c‌'), then went to
> each (or, possibly, selected, i guess) source blocks inside *that*
> (org-in-org) source block, and executed each, producing a #+RESULTS
> block for each, then closed the org-in-org source block (C-c‌', again),
> and then exported the containing .org file.
> 
> is this possible?  any ideas?


I have two alternative approaches:

1) Add an export engine for "org" to ox-ravel[1]. This is a trivial customization of `org-ravel-engines' to add a '("org" . "engine='org'") element.  Then add a custom language engine[2] for rmarkdown or knitr.

The actions for the makefile would be a ravel export to generate *.Rmd, *.Rnw, or *.Rhtml files followed by rmarkdown::render or knitr::knit on the generated files.

2) Define this function:

#+begin_src emacs-lisp
  (defun org-exe-org ()
    (let ((org-confirm-babel-evaluate nil))
      (org-edit-src-code)
      (org-babel-execute-buffer)
      (org-edit-src-exit)))
#+end_src

In an org buffer with one or more org src blocks containing R src blocks:

eval this

 (org-babel-map-executables nil (org-exe-org))

Then export the buffer to pdf or html.

I haven't tested this much, but for the snippet below evaluating that line and exporting to html produces two framed blocks with R src blocks and the results displayed in each:

--8<---------------cut here---------------start------------->8---
#+begin_src org
  ,#+begin_src R
    print("abc")
  ,#+end_src
#+end_src


#+begin_src org
  ,#+begin_src R
    print("def")
  ,#+end_src
#+end_src
--8<---------------cut here---------------end--------------->8---

I expect doing this in batch mode will not be a challenge.

For pdf output the result is rather plain. Maybe there is some minted idiom that would help?

HTH,
Chuck

p.s. I am an `ess-intro' member, in case it helps to move the conversation to there.


[1] https://github.com/chasberry/orgmode-accessories

[2] https://bookdown.org/yihui/rmarkdown-cookbook/custom-engine.html