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Re: [O] [patch, ox] Unnumbered headlines

From: Rasmus
Subject: Re: [O] [patch, ox] Unnumbered headlines
Date: Sun, 21 Sep 2014 16:37:50 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.4.50 (gnu/linux)


Thanks for the comments.  Let's give it another try, shand't we.

Nicolas Goaziou <address@hidden> writes:

>> I introduce a new function `org-export-get-headline-id` which returns
>> the first non-nil from the following list.  There's a caveat:
>> CUSTOM_ID is ensured to be unique!  Did I open the famous can of worm?
>> 1. The CUSTOM_ID property.
>> 2. A relative level number if the headline is numbered.
>> 3. The ID property
>> 4. A new generated unique ID.
> I think we should keep separated CUSTOM_ID and ID on the one hand, and
> internal reference on the other hand.
> There's no guarantee that CUSTOM_ID will be unique, and, even if you
> check it out, there's no guarantee either that its value can be used
> as-is in the generated docstring (think about ":CUSTOM_ID: 100%" in
> LaTeX export).
> CUSTOM_ID is a human readable reference to an Org headline. This
> headline should be referred to internally with a more specific id. To
> a lesser extent, I think this also applied to org-id.
> Also `org-export-headline-internal-id' (or some such, to avoid confusion
> with other IDs) may return a value simpler than what `org-id-new'
> returns (e.g. a dumb counter). If it is possible, the output will be
> easier to read.

Okay, I returned to my first hack (which never made it to this list).
Basically, I ID everything.  Unnumbered sections get the id
"unnumbered-sec-COUNTER" and numbered sections get the id

Perhaps you will find it too much of a hack.

The other easy alternative, which I find less pleasing, would have on
incremental counter, but it makes it harder to read.

A third alternative is give the numbers like in this patch, but store
the numbers for unnumbered section somewhere else
than :headline-numbering.

>> Anyhow, `org-export-get-headline-id' ensures that we can refer to
>> unnumbered headlines, which was not possible before.
> This is untrue.
>> Of course, in LaTeX such ref to a \section* will be nonsense, so we
>> could introduce a \pageref here.
> At the moment, referring to an unnumbered section displays its name.

In some modes, yes.  In LaTeX it produces a \ref{ยท} that LaTeX will
laugh at.

If you have a better idea than using the title I'm all ears!

>> +            (when (equal 'headline (org-element-type destination))
> Comparing symbols with `equal' is a sin beyond redemption. Use `eq'.

Shiiit. . .

Why, out of curiosity?  I though equal was like the meaner, tougher
eq, that gets shit right, but is a bit more expensive.

>> + (format "[%s]" (org-export-data (org-export-get-alt-title
>> destination info) info)))))))))
> alt title is for table of contents only.

Yeah, but I though, conditional on using title for ref when nothing
better exists, it would be nicer to have something shorter.  Anyway, I
changed it to plain title now.

> Nitpick: I suggest `and' instead of `when' since there's no side-effect.

OK, I think I got 'em all. 

>> +  (unless (org-export-get-node-property :UNNUMBERED headline t)
> Actually, this test is fragile. In the following example
>   * H1
>     :UNNUMBERED: t
>     :END:
>   ** H2
>      :UNNUMBERED: nil
>      :END:
>   *** H3



Don't panic!!!

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