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From: John Kitchin <jkitchin@andrew.cmu.edu>
Subject: Re: Trouble with autofill mode
Date: Tue, 04 Aug 2015 10:10:34 -0400
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To: Vikas Rawal <vikaslists@agrarianresearch.org>
Cc: org-mode mailing list <emacs-orgmode@gnu.org>, Vicente Vera <vicentemvp@gmail.com>

I would have thought something like this would work:
(defun nobreak-p ()
  (interactive)
  (let ((result (if (and (looking-at " ")
                         (save-excursion
                           (re-search-forward "[^{]*}" (line-end-position) =
'end))
                         (save-excursion
                           (re-search-backward "[^}]*\\\\index{" (line-begi=
nning-position) 'end)))
                    t
                  nil)))
    (message "%s" result)
    result))

(add-hook 'fill-nobreak-predicate #'nobreak-p)

at least, from what I can see it returns true everywhere it should not
break, but I still get breaks where I do not want them. maybe it could
give you an idea though.

Vikas Rawal writes:

>>>
>>> Hello,
>>> This StackExchange question might help you out:
>>> https://emacs.stackexchange.com/questions/12392/prevent-fill-paragraph-=
from-breaking-latex-citations-in-org-mode
>>> (Only if I got your question right...)
>>
>> Thanks very much. This should work. Let me try to modify it to my use ca=
se.
>>
>> Much appreciated.
>>
>
> This is turning out to be non-trivial for my limited knowledge of regex. =
We need a regex that would return true for all white spaces between  "\inde=
x{" and =E2=80=9C}" in a string like
>
> \index{this is an index} and then some text \index(and then another index}
>
> And then add-hook it to 'fill-nobreak-predicate.
>
> Various things that I have tried since yesterday did not get me anywhere.
>
> Vikas

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