org-redisplay-inline-images and export to HTML

[Brett Viren <bv@bnl.gov>]

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Someone recently posted a tip to add

  :post (org-redisplay-inline-images)

to a SRC block which generates an image in order to freshen the Emacs
buffer with the regenerated image each time the block is executed.  It
works *almost* fine but I have two problems which I hope someone can
help with.


1) Priming-the-pump

I'm using a document containing a GraphViz graph and running "dot" on it:

----------------------------------------------------------------------
#+BEGIN_SRC dot :cmd dot :cmdline -Tpng :file foo.png :exports results :post (org-redisplay-inline-images) 
  digraph "foo" {
    rankdir=LR;
    params -> builders;
    builders -> objects;
    objects -> file;
  }
#+END_SRC
----------------------------------------------------------------------

I do "C-c C-c" in the block and the buffer does not display any result.
I see the messages:

----------------------------------------------------------------------
No images to display inline
executing Dot code block...
Wrote /tmp/babel-11819Iqr/ob-input-11819Lrv
org-babel-ref-resolve: Reference 'No images to display inline' not found in this buffer
----------------------------------------------------------------------

If I do "C-c hh" to export to HTML I see:

----------------------------------------------------------------------
org-babel-exp processing...
No images to display inline [2 times]
executing Dot code block...
Wrote /tmp/babel-11819Iqr/ob-input-11819kTR
org-babel-ref-resolve: Reference 'No images to display inline' not found in this buffer
----------------------------------------------------------------------

And I get no HTML file produced.

If I now take out the :post and do "C-c C-c" I get this appearing just
after the SRC block as expected:

----------------------------------------------------------------------
#+RESULTS:
[[file:foo.png]]
----------------------------------------------------------------------

If I now add back the ":post" and do "C-c C-c" again I get the inlined
image.  I can now edit the SRC block and repeat the "C-c C-c" and I am
pleased to see the figure refresh each time.  It's great!  But, it needs
this "pump priming".


2) Post-priming, still no HTML export

After this "priming the pump" is done the second problem is that still a
"C-c hh" does not produce an exported HTML file.  Similar messages:

----------------------------------------------------------------------
org-babel-exp processing...
No images to display inline
Inline image display turned off
No images to display inline
executing Dot code block...
Wrote /tmp/babel-11819Iqr/ob-input-11819zYx
org-babel-ref-resolve: Reference 'No images to display inline' not found in this buffer
----------------------------------------------------------------------

Finally, if I remove the :post but leave the "#+RESULTS:" I can do 
a successful "C-c hh".  

So, the upshot is I have to keep adding and removing the :post to make
things work in different contexts.  This is obviously not so smooth.


Is there some way to both have my cake an eat it too?

Thanks!
-Brett.

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