From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jacek Generowicz <jacek.generowicz@cern.ch>
Subject: org-export-blocks, HTML, <p> problem.
Date: Sat, 8 Oct 2011 01:16:51 +0200
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I am trying to define a custom block for export to HTML with
org-export-blocks, but I'm getting confused by the way <p> tags are
inserted.

I've whittled my org-export-blocks-format-blah function down to the form

(defun huh/org-export-blocks-format-blah (body &rest headers)
    ;; One of the two trivial bodies shown below
        )

Both of my versions of the test function ignore the block body and
write a hard-wired placeholder instead. The placeholder is sandwiched
between a preamble and a postamble. In one test function the preamble
and post amble are written as HTML, in the other as plain text.

Odd things happen when I export *two* consecutive blocks with the HTML
version. The implementations of the two test functions and their
corresponding results are shown below.

  ==================================   |   
==================================
      body of format function          |     body of format function
  ==================================   |   
==================================
(concat                               |  (concat
  "\n#+HTML: . . . . BEFORE . . . .\n" |   "\n. . . . BEFORE . . . .\n"
  "body of block goes here"            |   "body of block goes here"
  "\n#+HTML: . . . . AFTER . . . .")   |   "\n . . . . AFTER . . . .")
                                       |
                                       |   
==================================
  ==================================   |               output
              output                   |   
==================================
  ==================================   |   <div id="content">
  <div id="content">                   |  <h1 class="title">My  
heading</h1>
  <h1 class="title">My heading</h1>    |
                                       |
                                       |
  <p>                                  |
  . . . . BEFORE . . . .               |  . . . . BEFORE . . . .
  body of block goes here              |      <p>
   . . . . AFTER . . . .               |  body of block goes here
  </p>                                 |  . . . . AFTER . . . .
  <p>                                  |
  . . . . BEFORE . . . .               |  . . . . BEFORE . . . .
  body of block goes here              |      body of block goes here
   . . . . AFTER . . . .               |  . . . . AFTER . . . .
  </p></div>                           |  </p></div>
  ==================================   |  
==================================

In the plain version, the all of preamble-body-postamble text is
enclosed in <p> ... </p>, once for each exported block.

In the HTML version, only one <p> ... </p> pair appears, enclosing
everything except the first preamble. (As my real preamble should
contain an opening tag which is closed in the postamble, the presence
of an unmatched <p> between the two causes trouble.)

Can you shed any light on what is going on?

Thanks.

(I am using org-mode version 7.7)