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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)

Hi,

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

>> 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

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
"sec-COUNTER".

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

>> 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{·} 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)))))))))
>

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
>     :PROPERTIES:
>     :UNNUMBERED: t
>     :END:
>   ** H2
>      :PROPERTIES:
>      :UNNUMBERED: nil
>      :END:
>   *** H3

Fixed.

Thanks,
Rasmus

--
Don't panic!!!

`