From mboxrd@z Thu Jan  1 00:00:00 1970
From: Viktor Rosenfeld <listuser36@gmail.com>
Subject: Re: [PATCH] Improve configurability of ox-koma-letter
Date: Sun, 5 May 2013 18:44:47 +0200
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To: Alan Schmitt <alan.schmitt@polytechnique.org>
Cc: emacs-orgmode@gnu.org, Rasmus <rasmus@gmx.us>

Hi Alan,

Alan Schmitt wrote:

> Hi Victor,
> 
> Viktor Rosenfeld writes:
> 
> > Hi Rasmus and Alan,
> >
> > I've changed the code so the value for foldmarks is passed through to
> > KOMA-Script. It's a bit ugly insofar as one has to specify
> > foldmarks:true to use the default values instead of other options, such
> > as backaddress:t. However, subject also uses a string already.
> 
> I have a question about this: is there some special magic that makes the
> string "nil" to be parsed as `nil' and not as the string?

I assume there must be. If I specify `foldmarks:nil' the if-statement in
line 294 evaluates it as false:

#+BEGIN_SRC emacs-lisp
(format "\\KOMAoption{foldmarks}{%s}\n" (if with-foldmarks with-foldmarks "false"))
#+END_SRC

> About the subject, I had a quick look at the code and I find it
> surprising: the default is "untitled", and I don't know how one can set
> it to nil (unless there is some magic in plist-get that transforms the
> "nil" string into nil).

Same as above. `subject:nil' causes the code to skip the when-statement in line
301.

#+BEGIN_SRC emacs-lisp
(let ((with-subject (plist-get info :with-subject)))
  (when with-subject
    (concat
     (format "\\KOMAoption{subject}{%s}\n" with-subject)
     (format "\\setkomavar{subject}{%s}\n\n"
             (org-export-data (plist-get info :title) info)))))
#+END_SRC

Note, that untitled prints the subject but without a prefix. Setting it to nil
hides the subject altogether.

> Please don't hesitate to educate me, I'm very much an emacs-lisp newbie.

Me too.

Cheers,
Viktor

> 
> Best,
> 
> Alan
>