[O] # of parameters of `org-latex-format-headline-function'

[Sebastien Vauban]

Hello,

During the summer, the number of parameters of the
`org-latex-format-headline-function' changed from 5 to 6: addition of
`info'.

The new version of my private formatting function is:

--8<---------------cut here---------------start------------->8---
  ;; function for formatting the headline's text
  (setq org-latex-format-headline-function
        'my/org-latex-format-headline)

  ;; markup for TODO keywords and for tags, as a printf format
  (defun my/org-latex-format-headline (todo todo-type priority text tags info)
    "Default function for formatting the headline's text."
    (concat (when todo
              (format "{%s\\textbf{\\textsc{\\textsf{%s}}}} "
                      (cond ((equal todo-type 'todo) "\\color{red}")
                            ((equal todo-type 'done) "\\color{teal}")
                            (t "\\color{gray}"))
                      todo))
            (when priority
              (format "\\framebox{\\#%c} " priority))
            text
            (when tags
              (format "\\hfill{}\\fbox{\\textsc{%s}}"
                (mapconcat 'identity tags ":")))))
--8<---------------cut here---------------end--------------->8---

That works on `master', but not on Org from ELPA (`maint').

As parts of my config file are shared between my coworkers, and as some
of them don't have Git Org but the ELPA package, how can I support both
versions of Org?

Do I have to test the Org version number, or is there a more clever way?

Best regards,
  Seb

-- 
Sebastien Vauban