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[O] latex export subtree: org-latex-export-process

From: Michael Bach
Subject: [O] latex export subtree: org-latex-export-process
Date: Wed, 25 Sep 2013 18:35:21 +0200
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:17.0) Gecko/20130801 Thunderbird/17.0.8

Dear org-mode Users and Developers,

(org-mode v8.1) I use the following function for customizable latex
export processes
#+begin_src emacs-lisp
(defun my-auto-tex-cmd (backend)
  "When exporting from .org with latex,
  automatically run latex, pdflatex, or xelatex as appropriate,
  using latexmk."
  (let ((texcmd))
    (cond ((string-match "LATEX_CMD: pdflatex" (buffer-string))
           (setq texcmd "latexmk -pdflatex=pdflatex -pdf %f"))
          ((string-match "LATEX_CMD: pdflatex-shell-escape" (buffer-string))
           (setq texcmd "latexmk -pdflatex=pdflatex --shell-escape -pdf
          ((string-match "LATEX_CMD: xelatex" (buffer-string))
           (setq texcmd "latexmk -pdflatex=xelatex -pdf %f"))
          (t (setq texcmd "latexmk -pdf %f"))
    (setq org-latex-pdf-process (list texcmd))))
(add-hook 'org-export-before-processing-hook 'my-auto-tex-cmd)

which essentially uses an earlier idea[1].  Now this works well if I
export an .org buffer as a whole.  If I export a subtree, the
`buffer-string` only contains the subtree without the .org buffer
header, so the `string-match` always fails.

Any ideas on how to best integrate this function during a subtree
export?  Maybe inside a hook that is run before the subtree is narrowed

Best Regards,

[1] http://lists.gnu.org/archive/html/emacs-orgmode/2010-10/msg00218.html

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