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Re: [Orgmode] org-exp-blocks: what about previewing blocks ?

From: Carsten Dominik
Subject: Re: [Orgmode] org-exp-blocks: what about previewing blocks ?
Date: Fri, 26 Jun 2009 06:17:51 +0200

On Jun 26, 2009, at 2:59 AM, Eric Schulte wrote:

Carsten Dominik <address@hidden> writes:

On Jun 18, 2009, at 11:32 AM, Nicolas Girard wrote:

2009/6/18 Carsten Dominik <address@hidden>

On Jun 17, 2009, at 2:40 AM, Nicolas Girard wrote:

Hi all,

currently the code in org-exp-blocks is intended for pre-processing
It seems to me like org-mode would gain a very powerful feature, if
blocks could also be previewed in their own buffer, using the same
mechanism as the org-format-latex function.
What do you think ?

I don't see how this could be done in a general way.  I guess you
mean in particular
the graphics blocks like ditaa?

Yes. For any block type bt, if it makes sense, it would be possible
to write such org-block-<bt>-generate-image(body) that takes the
block as argument and returns the path of the image it produced.

- for exporting: the existing org-export-blocks-format-<bt>
functions would simply call their respective
image and work the same ;
- for previewing a block of type <bt>: if such org-block-<bt>-
generate-image exists, call it and display it the same way org-
format-latex does

Wouldn't it be great ?

Yes, it would be.  First you will need to talk Eric Schulte into
splitting the image generation functions into separate functions.
The I could look into the preview functionality.

I recently sent out an email announcement of development on org-babel
which should provide a unified backend for evaluating source-code
contained in org-mode blocks. If org-exp-blocks is using org-babel for it's source-code evaluation the ability to interactively evaluate blocks
will come for free.  This would be my preference rather than
implementing a new code-evaluation schema for org-exp-blocks.

I suppose that this would assume that org-babel is accepted into the
core of org-mode (for it to be a requirement of org-exp-blocks which is
now part of the org-mode core).  While this would be my preference, it
is certainly not my decision to make, and I honestly haven't given it
much thought up until this point.

From your post yesterday, without looking closer at org-babel,
it sounded to me that it is still under heavy development,
so maybe it is too early for the core at this moment?

No principal objections, of course.

- Carsten

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