org-beamer empty titles

org-beamer empty titles

[Joseph Vidal-Rosset]

Hello everybody,

With an .org file for presentation:

#+TITLE:
#+DATE:
#+OPTIONS: H:2 toc:nil author:t
#+LATEX_CLASS: beamer-fr
#+LANGUAGE:fr

I meet the following problem:

If there is no title following star(s), then the export into frame does
not work. This behavior is not convenient: often space is needed in some
frame and titles are not necessary.

I do not find the solution, hence my email to this list.

Best wishes,

Jo.

Re: org-beamer empty titles

[Eric S Fraga]

On Sunday, 10 Oct 2021 at 17:12, Joseph Vidal-Rosset wrote:
> If there is no title following star(s), then the export into frame does

If you mean that you have a headline but with nothing but the *s, what
happens if you add a space after the last *?  I.e. have a not empty
headline but one that leads to nothing to print?  This works for me in
that the LaTeX compiles and the frame title is empty.

-- 
: Eric S Fraga via Emacs 28.0.60, Org release_9.5-93-gd87250
: Latest paper written in org: https://arxiv.org/abs/2106.05096

Re: org-beamer empty titles

[Joseph Vidal-Rosset]

Le 10/10/2021 à 19:22, Eric S Fraga a écrit :
> On Sunday, 10 Oct 2021 at 17:12, Joseph Vidal-Rosset wrote:
>> If there is no title following star(s), then the export into frame does
>
> If you mean that you have a headline but with nothing but the *s, what
> happens if you add a space after the last *?  I.e. have a not empty
> headline but one that leads to nothing to print?  This works for me in
> that the LaTeX compiles and the frame title is empty.

The problem is that, surprisingly, the space is deleted as soon as the
file is registered. I am using org-bullets, is it the cause of this
problem?


Thanks for your help, Eric.

All the best,

Jo.

Re: org-beamer empty titles

[Joseph Vidal-Rosset]

Le 10/10/2021 à 19:28, Joseph Vidal-Rosset a écrit :
>
>
> Le 10/10/2021 à 19:22, Eric S Fraga a écrit :
>> On Sunday, 10 Oct 2021 at 17:12, Joseph Vidal-Rosset wrote:
>>> If there is no title following star(s), then the export into frame does
>>
>> If you mean that you have a headline but with nothing but the *s, what
>> happens if you add a space after the last *?  I.e. have a not empty
>> headline but one that leads to nothing to print?  This works for me in
>> that the LaTeX compiles and the frame title is empty.
>
> The problem is that, surprisingly, the space is deleted as soon as the
> file is registered. I am using org-bullets, is it the cause of this
> problem?

I reply to my question about org-bullets: the reply is no. Registering
an empty title section delete the space and then the export frame does
not work. :(

Re: org-beamer empty titles

[Eric S Fraga]

On Sunday, 10 Oct 2021 at 17:44, Joseph Vidal-Rosset wrote:
> I reply to my question about org-bullets: the reply is no. Registering
> an empty title section delete the space and then the export frame does
> not work. :(

I am not sure what you mean by "registering".  You can type "* "
directly to create an empty headline, can you not?

In any case, you could try the following maybe:

*   :sometag:

or, if getting desperate, resort to some LaTeX magic:

* @@latex:}%@@

-- 
: Eric S Fraga via Emacs 28.0.60, Org release_9.5-93-gd87250
: Latest paper written in org: https://arxiv.org/abs/2106.05096

Re: org-beamer empty titles

[Joseph Vidal-Rosset]

Le 10/10/2021 à 22:04, Eric S Fraga a écrit :
> On Sunday, 10 Oct 2021 at 17:44, Joseph Vidal-Rosset wrote:
>> I reply to my question about org-bullets: the reply is no. Registering
>> an empty title section delete the space and then the export frame does
>> not work. :(
>
> I am not sure what you mean by "registering".  You can type "* "
> directly to create an empty headline, can you not?
>
> In any case, you could try the following maybe:
>
> *   :sometag:
>
> or, if getting desperate, resort to some LaTeX magic:
>
> * @@latex:}%@@
>
> --
> : Eric S Fraga via Emacs 28.0.60, Org release_9.5-93-gd87250
> : Latest paper written in org: https://arxiv.org/abs/2106.05096
>

Many thanks Eric, the magic LaTeX solution works (but why?).

"Registering" means "Ctrl-x-s" i.e. saving a file: when I save the org
file, the blank space disappears...

Best wishes,

Jo.

Re: org-beamer empty titles

[Eric S Fraga]

Hi Joseph,

On Sunday, 10 Oct 2021 at 21:30, Joseph Vidal-Rosset wrote:
> Le 10/10/2021 à 22:04, Eric S Fraga a écrit :
>> On Sunday, 10 Oct 2021 at 17:44, Joseph Vidal-Rosset wrote:
>>> I reply to my question about org-bullets: the reply is no. Registering
>>> an empty title section delete the space and then the export frame does
>>> not work. :(
>>
>> I am not sure what you mean by "registering".  You can type "* "
>> directly to create an empty headline, can you not?
>>
>> In any case, you could try the following maybe:
>>
>> *   :sometag:
>>
>> or, if getting desperate, resort to some LaTeX magic:
>>
>> * @@latex:}%@@
>>
>> --
>> : Eric S Fraga via Emacs 28.0.60, Org release_9.5-93-gd87250
>> : Latest paper written in org: https://arxiv.org/abs/2106.05096
>>
>
> Many thanks Eric, the magic LaTeX solution works (but why?).
>
> "Registering" means "Ctrl-x-s" i.e. saving a file: when I save the org
> file, the blank space disappears...
>
> Best wishes,
>
> Jo.
>
>
>

-- 
: Eric S Fraga via Emacs 28.0.60, Org release_9.5-93-gd87250
: Latest paper written in org: https://arxiv.org/abs/2106.05096

Re: org-beamer empty titles

[Eric S Fraga]

Hi Joseph,

apologies for earlier message: I hit wrong key by mistake so sent before
writing my reply!

On Sunday, 10 Oct 2021 at 21:30, Joseph Vidal-Rosset wrote:
> Le 10/10/2021 à 22:04, Eric S Fraga a écrit :
>> or, if getting desperate, resort to some LaTeX magic:
>>
>> * @@latex:}%@@
>
> Many thanks Eric, the magic LaTeX solution works (but why?).

A headline, say

* introduction

will get exported as

\begin{frame}{introduction}

so my magic incantation above gets exported as

\begin{frame}{}%}

Remember that a % is a comment character in latex.  Therefore, this is
an empty frame title.

> "Registering" means "Ctrl-x-s" i.e. saving a file: when I save the org
> file, the blank space disappears...

You must have something in the write-file-hooks that strips whitespace?

-- 
: Eric S Fraga via Emacs 28.0.60, Org release_9.5-93-gd87250
: Latest paper written in org: https://arxiv.org/abs/2106.05096

Re: org-beamer empty titles

[Joseph Vidal-Rosset]

Le 10/10/2021 à 23:30, Joseph Vidal-Rosset a écrit :
>
>
> Le 10/10/2021 à 22:04, Eric S Fraga a écrit :
>> On Sunday, 10 Oct 2021 at 17:44, Joseph Vidal-Rosset wrote:
>>> I reply to my question about org-bullets: the reply is no. Registering
>>> an empty title section delete the space and then the export frame does
>>> not work. :(
>>
>> I am not sure what you mean by "registering".  You can type "* "
>> directly to create an empty headline, can you not?
>>
>> In any case, you could try the following maybe:
>>
>> *   :sometag:
>>
>> or, if getting desperate, resort to some LaTeX magic:
>>
>> * @@latex:}%@@
>>
>> --
>> : Eric S Fraga via Emacs 28.0.60, Org release_9.5-93-gd87250
>> : Latest paper written in org: https://arxiv.org/abs/2106.05096
>>
>
> Many thanks Eric, the magic LaTeX solution works (but why?).

Just a word to thank again Eric Fraga for this solution and to describe
the way I have taken:

I have added to one of my personal configuration files the following code:

(global-set-key (kbd "C-c m") (lambda () (interactive) (insert
"@@latex:}%@@")))

And after each double star for beamer frame, after adding the relevant
space, I type C-c m  to insert @@latex:}%@@  when I do not want a title
for this frame, which is the most frequent case.

I hope it will help people who meet the same problem.

Best wishes,

Jo.

Re: org-beamer empty titles

[Eric S Fraga]

Jo,

I am curious to know why the second proposed solution, i.e. putting a
tag on the headline with no actual headline text, didn't work for
you.  It might be that you need to have

#+options: tags:nil

It worked for me and, at least to me, seems cleaner as you could then
have headlines like this:

**   :emptytitle:

which are more clear in terms of intent.  Like I said, just curious.

-- 
: Eric S Fraga via Emacs 28.0.60, Org release_9.5-93-gd87250
: Latest paper written in org: https://arxiv.org/abs/2106.05096

Re: org-beamer empty titles

[Joseph Vidal-Rosset]

Le 12/10/2021 à 09:47, Eric S Fraga a écrit :
> Jo,
>
> I am curious to know why the second proposed solution, i.e. putting a
> tag on the headline with no actual headline text, didn't work for
> you.  It might be that you need to have
>
> #+options: tags:nil
>
> It worked for me and, at least to me, seems cleaner as you could then
> have headlines like this:
>
> **   :emptytitle:
>
> which are more clear in terms of intent.  Like I said, just curious.
>
> --
> : Eric S Fraga via Emacs 28.0.60, Org release_9.5-93-gd87250
> : Latest paper written in org: https://arxiv.org/abs/2106.05096
>

I just tried what you suggested to me. The result is always the same: I
get the following title:
:emptytitle:
but this title is not empty, contradiction. :)

More seriously, the best solution for me would be to allow saving a file
with a space just after **  without deleting this space... I do not know
which code provokes this deletion.

Best wishes,

Jo.

Re: org-beamer empty titles

[Eric S Fraga]

On Tuesday, 12 Oct 2021 at 08:05, Joseph Vidal-Rosset wrote:
> I just tried what you suggested to me. The result is always the same: I
> get the following title:
> :emptytitle:
> but this title is not empty, contradiction. :)

This is very strange.  What does the LaTeX code generated look like for
this case?  In my case, I get:

\begin{frame}[label={sec:org4b25942}]{}
some text for the slide
\end{frame}

> More seriously, the best solution for me would be to allow saving a file
> with a space just after **  without deleting this space... I do not know
> which code provokes this deletion.

Maybe have a look at your write-file-hooks and write-file-functions
variables to see if there is some invocation that strips whitespace?

You may wish to use the whitespace package (for a little time) to see
when a space at the end of headline disappears.  The whitespace package
is part of Emacs.

-- 
: Eric S Fraga via Emacs 28.0.60, Org release_9.5-93-gd87250
: Latest paper written in org: https://arxiv.org/abs/2106.05096

Re: org-beamer empty titles

[Joseph Vidal-Rosset]

Le 12/10/2021 à 13:51, Eric S Fraga a écrit :
> On Tuesday, 12 Oct 2021 at 08:05, Joseph Vidal-Rosset wrote:
>> I just tried what you suggested to me. The result is always the same: I
>> get the following title:
>> :emptytitle:
>> but this title is not empty, contradiction. :)
>
> This is very strange.  What does the LaTeX code generated look like for
> this case?  In my case, I get:
>
> \begin{frame}[label={sec:org4b25942}]{}
> some text for the slide
> \end{frame}

I get  this :

\begin{frame}[label={sec:org89e57ca}]{:emptytitle:}
\begin{block}{test}
test
\end{block}
\end{frame}

>> More seriously, the best solution for me would be to allow saving a file
>> with a space just after **  without deleting this space... I do not know
>> which code provokes this deletion.
>
> Maybe have a look at your write-file-hooks and write-file-functions
> variables to see if there is some invocation that strips whitespace?
>
> You may wish to use the whitespace package (for a little time) to see
> when a space at the end of headline disappears.  The whitespace package
> is part of Emacs.

Thanks ! I am going to see this point, very soon.

All the best,

Jo.

Re: org-beamer empty titles

[Eric S Fraga]

On Tuesday, 12 Oct 2021 at 13:58, Joseph Vidal-Rosset wrote:
> I get  this :
>
> \begin{frame}[label={sec:org89e57ca}]{:emptytitle:}

I don't understand.  Maybe somebody else on the list can test this?

-- 
: Eric S Fraga via Emacs 28.0.60, Org release_9.5-93-gd87250
: Latest paper written in org: https://arxiv.org/abs/2106.05096

Re: org-beamer empty titles

[Ihor Radchenko]

Eric S Fraga <e.fraga@ucl.ac.uk> writes:
> I don't understand.  Maybe somebody else on the list can test this?

A blind shot: something to do with
https://orgmode.org/list/87tumvdno3.fsf@gmail.com

Hope it helps.

Best,
Ihor

Re: org-beamer empty titles

[Eric S Fraga]

Ihor, thank you for this.

Jo, what actual version of org are you using?  I'm using a fairly recent
version (as of last week) so maybe what you want to do is possible now
but was not earlier?

-- 
: Eric S Fraga via Emacs 28.0.60, Org release_9.5-93-gd87250
: Latest paper written in org: https://arxiv.org/abs/2106.05096

Re: org-beamer empty titles

[Joseph Vidal-Rosset]

Le 12/10/2021 à 17:01, Eric S Fraga a écrit :
> Ihor, thank you for this.
>
> Jo, what actual version of org are you using?  I'm using a fairly recent
> version (as of last week) so maybe what you want to do is possible now
> but was not earlier?
>
> --
> : Eric S Fraga via Emacs 28.0.60, Org release_9.5-93-gd87250
> : Latest paper written in org: https://arxiv.org/abs/2106.05096
>

Maybe. I'm using presently Prelude Emacs and in elpa I have org-20210920/

What can I do?

All the best,

Jo.

Re: org-beamer empty titles

[Eric S Fraga]

On Tuesday, 12 Oct 2021 at 17:35, Joseph Vidal-Rosset wrote:
> Maybe. I'm using presently Prelude Emacs and in elpa I have org-20210920/

I don't know.  Sorry.

-- 
: Eric S Fraga via Emacs 28.0.60, Org release_9.5-93-gd87250
: Latest paper written in org: https://arxiv.org/abs/2106.05096

Re: org-beamer empty titles

[Ihor Radchenko]

Joseph Vidal-Rosset <joseph@vidal-rosset.net> writes:

> Maybe. I'm using presently Prelude Emacs and in elpa I have org-20210920/
>
> What can I do?

I guess https://prelude.emacsredux.com/en/latest/support/
ELPA does have the right Org mode version:
http://elpa.gnu.org/packages/org.html

Re: org-beamer empty titles

[Joseph Vidal-Rosset]

To Eric and to Ihor, many thanks. My problem was already solved by Eric
with the LateX magic trick, so, I consider now that the problem is solved.

Best wishes,

Jo.

Le 13/10/2021 à 09:50, Ihor Radchenko a écrit :
> Joseph Vidal-Rosset <joseph@vidal-rosset.net> writes:
>
>> Maybe. I'm using presently Prelude Emacs and in elpa I have org-20210920/
>>
>> What can I do?
>
> I guess https://prelude.emacsredux.com/en/latest/support/
> ELPA does have the right Org mode version:
> http://elpa.gnu.org/packages/org.html
>

Re: org-beamer empty titles

[Joseph Vidal-Rosset]

Le 12/10/2021 à 13:51, Eric S Fraga a écrit :
> On Tuesday, 12 Oct 2021 at 08:05, Joseph Vidal-Rosset wrote:
>> More seriously, the best solution for me would be to allow saving a file
>> with a space just after **  without deleting this space... I do not know
>> which code provokes this deletion.
>
> Maybe have a look at your write-file-hooks and write-file-functions
> variables to see if there is some invocation that strips whitespace?

The file.el of which this function depends is to big and too complicated
for me.

>
> You may wish to use the whitespace package (for a little time) to see
> when a space at the end of headline disappears.  The whitespace package
> is part of Emacs.
>
> --
> : Eric S Fraga via Emacs 28.0.60, Org release_9.5-93-gd87250
> : Latest paper written in org: https://arxiv.org/abs/2106.05096
>

This problem was also described here:

https://emacs.stackexchange.com/questions/54970/preserving-the-space-immediately-after-an-org-heading-when-deleting-trailing-whi

But no solution was given.

All the best,

Jo.