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[O] Conditionally formatting org-html-postamble-format

From: Kaushal Modi
Subject: [O] Conditionally formatting org-html-postamble-format
Date: Tue, 26 Jan 2016 21:46:38 +0000


I have the org-html-postamble-format set to the below:

(setq org-html-postamble-format
                     ,(concat "Exported using "
                              ;; "%c" is replaced with `org-html-creator-string'
                              ;; Emacs <VERSION> (Org mode <VERSION>)
                              "<div style=\"display: inline\" class=\"creator\">"
                              "%c</div> "
                              "by %a. — "
                              "<div style=\"display: inline\" class=\"date\">"

It works great except for the cases where I have set a document author to nothing using 


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 "".

Right now, if the author is nil, the postamble gets exported as:

Exported using 
Emacs (Org mode 8.3.3)
 by . — 
Jan 26 2016, Tue

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