From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Robert H. Klein" <roklein@roklein.de>
Subject: Re: Conditionally formatting org-html-postamble-format
Date: Wed, 27 Jan 2016 19:26:00 +0100
Message-ID: <20160127192600.08cdad14@lt70.mpip-mainz.mpg.de>
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To: Kaushal Modi <kaushal.modi@gmail.com>
Cc: emacs-org list <emacs-orgmode@gnu.org>

Hi,

Kaushal Modi <kaushal.modi@gmail.com> wrote:

> Hi,
>=20
> I have the org-html-postamble-format set to the below:
>=20
> (setq org-html-postamble-format
>                   `(("en"
>                      ,(concat "Exported using "
>                               ;; "%c" is replaced with
> `org-html-creator-string'
>                               ;; Emacs <VERSION> (Org mode <VERSION>)
>                               "<div style=3D\"display: inline\"
> class=3D\"creator\">" =20
>                               "%c</div> "
>                               "by %a. =E2=80=94 "
>                               "<div style=3D\"display: inline\"
> class=3D\"date\">" =20
>                               "%d</div>"))))
>=20
>=20
> It works great except for the cases where I have set a document
> author to nothing using
>=20
> #+AUTHOR:
>=20
> What would be the best way to set the postamble so that the "by %a"
> portion does not get printed if the %a value is "".
>=20
> Right now, if the author is nil, the postamble gets exported as:
>=20
> Exported using
> Emacs <http://www.gnu.org/software/emacs/> 25.0.50.1 (Org
> <http://orgmode.org/> mode 8.3.3)
>  by . =E2=80=94
> Jan 26 2016, Tue


how about using a postamble function instead of
html-postamble-format, something like

(let ((author (car (plist-get info :author))))
  (when (not (equal author ""))
    "by " author ". "))
" - "

instead of "by %a. - "

and similar for the rest of the %-thingies.

Note, you'll probably have to inspect the plist, the (car ...) I'm
using in some project for getting the title.

Best regards
Robert