On Wed, Jan 19, 2022 at 12:18 PM John Kitchin <jkitchin@andrew.cmu.edu>
wrote:

> I am not sure this is quite what you are looking for. You could use a
> macro like this.
>
>
>
> {{{r-stack(((src1 . fade-out) (src2 . fade-in) (src3 . fade-out)))}}}
>
> * code :noexport:
>
> #+macro: r-stack (eval (r-stack $1))
>
> #+BEGIN_SRC emacs-lisp
> (defun r-stack (src-alist)
>   "SRC-alist will be a string containing a list of (src . data-fragment)
> src is a url or filename
> data-fragment
>
> Returns a string for export."
>   (let ((src (read src-alist)))
>     (format "#+BEGIN_EXPORT html
> <div class=\"r-stack\">
> %s
> </div>
> ,#+END_EXPORT"
>    (string-join
>     (cl-loop for (src . data-fragment) in src
>      collect
>      (format "  <img data-fragment=\"%s\" src=\"%s\"/>"
>      data-fragment src))
>     "\n"))))
>
>
> (r-stack "((src1 . fade-out) (src2 . fade-in) (src3 . fade-out))")
> #+END_SRC
>
> #+RESULTS:
> : #+BEGIN_EXPORT html
> : <div class="r-stack">
> :   <img data-fragment="fade-out" src="src1"/>
> :   <img data-fragment="fade-in" src="src2"/>
> :   <img data-fragment="fade-out" src="src3"/>
> : </div>
> : #+END_EXPORT
>
> You could also make a link do that.
>

Huh.  This wasn't at all what I was thinking but it may be a much better
way than I'd htought of.

A link seems like it would be a great solution, especially if I could
figure out how to get the :follow function to open an individual ~src~
path. Would you use "looking-at" to get the right candidate, or can you
think of a way to get completion candidates for a function that opens the
file? I'm looking at your eamples in
https://kitchingroup.cheme.cmu.edu/blog/2016/11/04/New-link-features-in-org-9
but can't quite follow the code.

Thank so mjch for this really interesting solution.

>
> John
>
> -----------------------------------
> Professor John Kitchin (he/him/his)
> Doherty Hall A207F
> Department of Chemical Engineering
> Carnegie Mellon University
> Pittsburgh, PA 15213
> 412-268-7803
> @johnkitchin
> http://kitchingroup.cheme.cmu.edu
>
>
>
> On Wed, Jan 19, 2022 at 9:42 AM Matt Price <moptop99@gmail.com> wrote:
>
>> I am trying ot figure out if I can create a simplified syntax for a
>> particular special block in a derived HTML exporter.
>>
>> I'm trying to produce HTML like this:
>>
>> <div class="r-stack>  <img data-fragment="fade-out" src="...."/>  <img data-fragment="fade-in" src="..."/></div>
>>
>> The derived backend (org-re-reveal) already has an
>>
>> #+ATTR_REVEAL that an make the data-fragment attributes, so it's not hard to produce
>>  the desired outpu:
>>
>> #+begin_r-stack
>> #+ATTR_REVEAL: :frag appear[[imglink1]]
>> #+ATTR_REVEAL: :frag appear[[imglink2]]#+end_r-stack
>>
>> However, I'd really like to add a less verbose syntax, like this:
>>
>> #+begin_r-stack :frag (appear appear)[[imglink1]][[imglink2]]#+end_r-stack
>>
>> My question is: will the exporter preserve information from these header-like arguments, and is
>> there a mechanism I can use in a custom ~special-block-function~ to make use of htem?
>>
>> Thanks for your help as always!
>>
>> Matt
>>
>>