From mboxrd@z Thu Jan  1 00:00:00 1970
From: Nick Dokos <nicholas.dokos@hp.com>
Subject: Re: New exporter macro question
Date: Mon, 11 Feb 2013 09:43:12 -0500
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In-reply-to: Message from Carsten Dominik <carsten.dominik@gmail.com> of
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Carsten Dominik <carsten.dominik@gmail.com> wrote:

> 
> On 11 feb. 2013, at 13:48, Carsten Dominik <carsten.dominik@gmail.com> wrote:
> 
> > 
> > Hi,
> > 
> > I am porting my websites to the new exporter, finally.  Much is very smooth.  I do have a problem with macros:
> > 
> > 
> > * Macro definition
> > 
> > 
> >   #+MACRO: thumbright #+ATTR_HTML: style="float:right;width:$1;margin:0px 20px 0px 20px;"  \n     [[./Content/$2/thumb.jpg]]
> > 
> > 
> > 
> > * Macro call
> > 
> >   {{{thumbright(300px,Wiskunde)}}}
> > 
> > 
> > 
> > 
> > * This used to expand to
> > 
> >   <img src="./Content/Wiskunde/thumb.jpg" style="float:right;width:300px;margin:0px 20px 0px 20px;" alt="./Content/Wiskunde/thumb.jpg" />
> > 
> > 
> > * But now it expands to nothing
> >  I am sure I am missing something basic.  Thanks!
> 
> OK, I see, this seems to be because the "\n" is no longer interpreted as a newline character upon macro expansion, so the entire text ends up in the ATTR_HTML line and is treated as a comment.
> 
> Is there a way to get what I meant?
> 

It seems to be coming from deep with emacs: if I create a buffer
with

x y z \ x y z

and evaluate (with point somewhere on that line)

  (buffer-substring-no-properties (point-at-bol) (point-at-eol))

I get "x y z \\ x y z", so the backslash is escaped willy-nilly.

This happens in org-element-keyword-parser. I don't know if the
macro expansion would replace \n with a newline absent the extra
backslash, but I'm sure that its presence does not help any.

Nick