Re: [FR] :noweb-wrap header arg

[Ihor Radchenko <yantar92@posteo.net>]

Amy Grinn <grinn.amy@gmail.com> writes:

>>> +        (while (< (point) (point-max))
>>> +          (unless (looking-at " *\"\\([^\"]+\\)\" *")
>>> +            (looking-at " *\\([^ ]+\\)"))
>>
>> May you please explain the rationale behind this regexp? AFAIU, it
>> implies that you want to allow whitespace characters inside :noweb-wrap
>> boundaries. But I do not think that we need to complicate things so much.
>
> That is exactly what I was going for.  I thought about the ways this
> could be used and the most general-purpose, non-syntax-breaking,
> easily-recognizable way I could think of was to use the language's
> line-comment construct followed by the standard << >> characters.
>
> # <<foo>>
> ;; <<bar>>
> // <<baz>>
>
> I can see how it might be harder to maintain to allow whitespace in the
> noweb-wrap header arg.  I could create a separate org-parse-arg-list
> function to ease that burden somewhat.  My opinion is that having the
> option to use the examples above is preferable to using non-standard
> wrappers, from a third-person point-of-view.

Makes sense. Also, see a similar idea being discussed in
https://list.orgmode.org/orgmode/87o7jlzxgn.fsf@localhost/

I recommend the following:

If the value starts from ", use Elisp's `read':
   |"# <<" ">>"
   (read (current-buffer)) ; => "# <<"
   otherwise, consider read until the first whitespace.
   |#<<; >>;
   (re-search-forward (rx (1+ (not whitespace))))
   #<<;|
   
However, there may be edge cases like

"<< >>"
"<< >>
<< << >>
<< "asd" >>

-- 
Ihor Radchenko // yantar92,
Org mode contributor,
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