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Re: [O] link recognition in orgmode

From: John Kitchin
Subject: Re: [O] link recognition in orgmode
Date: Tue, 05 Sep 2017 20:29:34 -0700
User-agent: mu4e 0.9.19; emacs 25.2.1

Nicolas Goaziou writes:

> Hello,
> John Kitchin <address@hidden> writes:
>> With this definition of a link in org-9:
>> #+BEGIN_SRC emacs-lisp
>> (org-link-set-parameters "test" :follow (lambda (path) (message "check")))
>> #+END_SRC
>> Should both of these be "linkfied"? I would have expected the first one
>> to be, but not the second one. It seems like the "test:rtree" parts of
>> both of these are linkified.
>>  test:rtree  :test:rtree
> It looks correct. `org-plain-link-re' regexp expects a word boundary
> before the type. If you disagree, what do you suggest as allowed
> characters before a plain link?

I thought I knew the answer to that, which is I normally would say a
space or a [, but...

The reason this came up is related to restructured text in a src block
docstring. For example, using
one can write: "See :cite:`1987:nelson` for an introduction to
non-standard analysis." and the cite: appears to be recognized as part
of a link with `1987:nelson` as the path. In this case I would not
expect that to be interpreted as a link. The backticks in the path are
a little problematic for org-ref since they are not part of the actual

However, it is pretty common (in my work) to put citations right after
punctuation when they are superscripted, e.g. after a comma,cite:somekey
or after the end of a sentence.cite:anotherkey. That is common because
old LaTeX packages couldn't put them in the right place; it was up to
you. It is a pain to switch to bracketed citations though, because
brackets typically go before punctuations. I normally use bracketed
links in this scenario, but I would expect plain links to work here
(mostly because they always have), including all the other punctuations.

Newer latex packages handle the citation placement for you and let you
do what makes the most sense to me which is to put citations before a
comma like cite:thirdkey, and before a period cite:fourthkey. That way
the citations are in the sentence they belong to and the rest is just
styling during export.

So, in the end I am a little conflicted on the solution here. It seems
specific to this particular markup conflict, which is links should not
start with " :" or "^:". On the other hand, org-ref fails harmlessly for
me (although in some setups it might lead to a traceback, e.g.
https://github.com/jkitchin/org-ref/issues/492), and I am inclined to
leave well enough alone and stick with the harmless fail (the fail is
when you generate help on the link and it can't find the key in the
bibtex file).


> Regards,

Professor John Kitchin
Doherty Hall A207F
Department of Chemical Engineering
Carnegie Mellon University
Pittsburgh, PA 15213

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