[O] A way to export to ODT

[e***@openmail.cc]

I want to share this little recipe in the hope that it is useful to
someone. It is a partial solution to exporting with MathML to ODT from
Org. I am not a fan of ODT, but my boss need DOCX like dope.

To get a working file
1. To get siunitx (partially) working, download
[[https://github.com/Authorea/LaTeXML/blob/master/lib/LaTeXML/Package/siunitx.sty.ltxml][siunitx.sty.ltxml
from Authorea's github.com]]
(there is an issue on the upstream
[[https://github.com/brucemiller/LaTeXML][LaTeXML]] for this already;
the author may be more motivated is someone else asks for it and/or
helps) and save it somewhere (remember this location, you'll need it
later). Here, ~~/.emacs.d/plugins~ is used.

Do ~C-c C-c~ or ~C-c C-v C-e~
(src_emacs-lisp{(org-babel-execute-maybe)}) on the following block to
add ~\mathrm{·}~ to the symbols (this removes italics from units).
Change the path to the file accordingly.
#+BEGIN_SRC bash
sed -i "s-\(DefMacro.*\)'\([[:alpha:]]*\)'-\1'\\\\mathrm{\2}'-g"
~/.emacs.d/plugins/siunitx.sty.ltxml
#+END_SRC

Add any required symbol to that same file (note that there is a ~\mm~
which should be ~\mmHg~; commit e134a5b @ Jul 24, 2017). Note that if
you add something like ~DefMacro('\mm','some');~, strange things start
to happen.

2. Install ~latexml~ (with ~latexmlmath~;
https://dlmf.nist.gov/LaTeXML/get.html). Then, execute this command in
Emacs (change ~latexmlmath~ to the actual path)
#+BEGIN_SRC emacs-lisp
(setq org-latex-to-mathml-convert-command
"latexmlmath --presentationmathml=%o --preload=siunitx
--path=~/.emacs.d/plugins/ --includestyles \"%i\"")
#+END_SRC

3. Set the ~#+OPTIONS: LaTeX:t~ somewhere in the document

4. Export to odt with Org-mode (~C-c C-e o o~), and run this (you can do
~C-c C-c~ on it; make sure that LibreOffice is not running)
#+BEGIN_SRC shell
libreoffice --headless --convert-to doc
./<this-file-sans-extension>.odt
#+END_SRC

You can use a template with the line (change file name accordingly).
Modify the file at will.
#+BEGIN_SRC org
,#+ODT_STYLES_FILE: "../Templates/odt-review-template.ott"
#+END_SRC

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