Re: [BUG] WORG example for ob-lilypond is no longer working as described (was: Moving some lisp/ob-*.el files to org-contrib - your advice?)

[Jonathan Gregory <jgrg@autistici.org>]

On 28 Jul 2023, Ihor Radchenko wrote:

> I am slightly confused because there seems to be a need to 
> define some page settings manually to get "embedded" images. In 
> the examples in 
> https://orgmode.org/worg/org-contrib/babel/languages/ob-doc-lilypond.html#org2c29903, 
> there is no mention that we need to define page geometry. Yet, 
> the section is claiming that base mode "can embed LilyPond 
> snippets into an Org-mode file".

It is confusing, I agree, and I'm still learning as we move 
forward. I guess the question is should basic mode *always* 
generate cropped images? If the answer is yes, and it looks like 
it is, then maybe we should include paper settings in the 
ob-lilypond file.

The basic-mode term is not very helpful. Perhaps 
[inline/cropped/embedded]-mode would have been more descriptive in 
terms of what it does. Anyway, hard-coding paper settings would 
simplify things a bit, but I'm not sure that hard-coding the 
version is a good idea and may produce errors with older 
installations.

>>> Noweb and babel references are not allowed in header args. And 
>>> ob-emacs-lisp also does not support :prologue.
>>
>> I see, so there's no built-in way to auto-insert a boilerplate 
>> without using the <<>> reference *inside* source blocks. 
>> Anyway, let's not worry about this for now.
>
> There is, but you will have to use direct Elisp to get :prologue 
> string:
>
> #+name: test
> #+begin_src emacs-lisp
>
> (message "This is test")
> #+end_src
>
> #+begin_src emacs-lisp :prologue (org-sbe test)
> (+ 1 2)
> #+end_src

Interesting. I didn't know about org-sbe. Looks useful. I'll look 
into it when I find time. In the meantime, we can use:

#+PROPERTY: header-args:lilypond :noweb yes :exports results 
 :prologue (org-sbe version-and-paper)

if we replace "lilypond" with "org" in the version-and-paper 
block. Prologue is useful also for those of us who keep their 
settings in a separate file:

#+PROPERTY: header-args:lilypond :exports results :prologue 
 "\\include \"settings.ly\""

Thanks!

-- 
Jonathan