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Re: [Orgmode] Re: Beamer support in Org-mode

From: Carsten Dominik
Subject: Re: [Orgmode] Re: Beamer support in Org-mode
Date: Thu, 26 Nov 2009 15:54:54 +0100

Hi Sebastian,

On Nov 26, 2009, at 3:01 PM, Sébastien Vauban wrote:

Hi Carsten,

Carsten Dominik wrote:
[...] before I polish I would like comments on this outline.

1 Organization

1.1 Sections

By default, level one headlines become sections in the beamer
document.  You can configure the variable org-beamer-frame-level
to change this.  Setting it to three will make level 2 headlines
become subsections.  For the rest of this document, I will assume
that this variable has its default value 2.

I was used to use Org level-1 headlines as the frame title... but I've never resolved how to put sections in my beamer slides (via Org) -- though this was not that important yet for me, as I only converted slides made by others in PowerPoint, and they don't have such sections (and TOC visible in the left

Though, I find this way of structuring excellent: sound and logical. Plus it
is even customizable. What else would we want?  Nothing...

1.2 Frames
Level 2 headline (or the level configured in
org-beamer-frame-level) become frames.  The headline text become
the frame title, but if no headline text is given, the frame gets
no title.  If the frame title contains the string "\\", the line
will be split at that location, and the second half become the
frame /subtitle/.

Excellent. Really.

1.3 Columns
Headlines one below frames (level 3 by default) can be used start
columns on a frame.  The presence of such a headline without a
beamer tag (see below) will create the columns environment.  The
text in the headline is ignored.  It is helpful to write
"columns" in this headline anyway.

Would *I* be asked about my true opinion, I would really object against this one... Except that you say "can be used". So, I guess we're not forced.

Of course *you* are asked.

I am wondering:  What function do the headlines in your document
under the frame level have?  How do you export them?  I guess
you can't have them spit out subsection or so.  What you your
class configuration?

My main "problem" here is that I like the idea of being to convert back or forward between Org documents and Org-beamer documents. Such headlines would not mean anything for a "normal" Org document, as you already pointed out.

Now, if this is not the default interpretation, it could be OK for everybody.
We should show this in the example below:
- normal level-3 headlines (level-1 for Beamer) and
- "column" level-3 headlines.

Yes, this would be useful. Indeed, we should work on an extensive example once we have settled for a structure/format. Which is not yet the case.

- Carsten

1.4 A column
Headlines below a columns environment (level 4 by default) open a
column.  The text in the headline should be a number smaller than
one and will be used to define the column width.

1.5 Block-like environments
Any headline can become a block-like environment by tagging it
with a beamer tag.  For examples, `:B_block:' will trigger the
creation of a block environment, while `:B_theorem:' will trigger
the creation of a theorem environment.  When it makes sense, the
headline text is used in an appropriate argument of the
environment, if that does not make sense, it is ignored.

1.6 Overlay/action tag and environment options
Any headline can contain three types of cookies

`<...>': The overlay/action setting for the environment
`[<...>]': The default overlay/action specification for the
    content of the environment, which can be overwritten locally
    by each content element.
`[...]': Optional argument(s) for the environment

These can be given in arbitrary order freely in the headline.
Org-mode will fish them out and insert them in the appropriate
locations in the \begin statement of the environment.

I never really used overlays yet (only to play with). Though, this seems nice
to me, even if...

Having these cookies plainly in the headline reduces the
usability of the document as a normal document.  I have been
thinking to move them into comments or properties, but I think
this is, in the end, less convenient.  I people want to export
these in other ways as well, we can write a function to clean

1.7 Overlay/action in list environment
For plain list environments (ordered, unordered, and description
lists) you can start each item optionally with an overlay
specification `<...>'.  If any item in the list contains a
default specification `[<...>]', this will be moved into the
begin statement of the itemize/enumerate/description environment,
to provide a default setting for the list items.

1.8 Embedded LaTeX
As is normal for Org-mode, you can embed LaTeX commands into the
text, and they will be transferred literally into the exported
document.  In particular, you can also embed beamer-specific

1.9 Example
Here is a (still very incomplete) example Org document that is
intended for beamer export.

 #+LaTeX_CLASS: beamer
 #+TITLE: Example Presentation
 #+AUTHOR: Carsten Dominik

 * This is the first structural section
 ** Frame 1 \\ with a subtitle
 *** columns will be used
 **** 0.3
 ***** Thanks   :B_block:
       Thanks to Eric Fraga for the first viable beamer setup in Org
 ***** Here we continue after the block :B_normal:
       using a "normal" environment that helps to keep the structure
       after a block
 **** 0.7
 ** Frame 2 \\ where we will not use columns
*** Request :B_block:
     Please test this stuff!

I don't know if this can help you/us, but here is an example file I play with.

--8<---------------cut here---------------start------------->8---
#+TITLE:     All-in file for testing Beamer with Org-mode
#+AUTHOR:    Seb Vauban
#+DATE:      2009-11-26
#+OPTIONS:   H:3 num:t toc:t \n:nil @:t ::t |:t ^:t -:t f:t *:t <:t

#+LaTeX_CLASS: beamer

#+MACRO: BEAMERMODE presentation

* Development
** Context
*** Currently mainly manual
*** Error prone
*** High risks
** Requirements
*** Quality
**** Reduce risk
**** Reduce cost
**** Improve resilience
*** Flexibility
**** Enhance agility

* Architecture
** High-level view
  #+BEGIN_ditaa archi.png
/-----------\ /--------------\ /--------------\ +----------+ |cBLU | |cBLU | |cRED | | cBLU {s} | | Browser | http | UI | gpb | App Server | | Database | | |------| |------| |------| | \-----------/ \--------------/ \--------------/ +----------+

* Why?
** Reason 1
  Text explaining reason 1.
** Reason 2
  ... more explanations.
** Reason 3
  Blah, blah, blah.
** Reason 4
  Why not?

* What?
** First piece
*** Second piece
**** Third piece
** Fourth piece

* Rule language
** Horn clauses
** Allowed atoms
*** Class literals
*** Property literals
*** Builtin literals
#   #+LaTeX: \begin{lstlisting}
#   months_employed(?applicant, ?months) ~$\wedge$~
#   lessThan(?months, 3) ~$\wedge$~
#   assets(?applicant, ?assets) ~$\wedge$~
#   lessThan(?assets, 10000.0)
#   ~$\rightarrow$~ RejectedApplicant(?applicant)
#   #+LaTeX: \end{lstlisting}
--8<---------------cut here---------------end--------------->8---

Don't know why, but the block code does not work anymore (just commented it). Have not time to debug it now -- have to work for my clients. Will do later.

Our example should still include:
- C code (or other),
- table,
- big image,
- "wrapped" image,
- overlay image (appears/disappears with animations),
- TikZ picture,
- etc.

Maybe we can put such a "test" file in git, and enhance it as we go?

2 org-beamer-mode

Org-mode defines a minor mode org-beamer-mode.  The mode is
turned on automatically when the export class as specified
in #+LaTeX_CLASS is "beamer".  Currently foreseen features are
listed below, more could be added where it makes sense.

2.1 Fast tag selection for beamer environments
The command `C-c C-b' will offer fast selection of the various
tags that trigger specific beamer environments for a headline

2.2 Special font-locking of beamer tags
The special tags are highlighted by a special font

If I sum up, all of this seems to me:


My concern is just to ensure we can easily transform a normal Org document to Beamer slides, or even have both versions in one file (handouts + notes). Though, I must admit I have no example of the latter in Beamer either. Still a
young user of Beamer.

Best regards and many thanks for all, once again,

Sébastien Vauban

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- Carsten

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