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List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-orgmode-bounces+larch=yhetil.org@gnu.org Sender: emacs-orgmode-bounces+larch=yhetil.org@gnu.org X-Migadu-Flow: FLOW_IN X-Migadu-Country: US X-Migadu-Spam-Score: -2.81 X-Migadu-Scanner: mx2.migadu.com X-Migadu-Queue-Id: 565C653419 X-Spam-Score: -2.81 X-TUID: AJsHXaIqunbL On 27/09/2023 02:12, Juan Manuel Macías wrote: > Max Nikulin writes: > >> I just have checked that a dirty hack with a few lines of code for >> `org-export-filter-final-output-functions' allows to insert arbitrary >> text to the beginning of export result. Perhaps a more elegant solution >> exists, but I admit it is not a straightforward way. At least it is >> possible. > > And it is also possible by simply defining a new class (in Org > terminology, not LaTeX). My usual class is an almost empty one, without > documentclass and without packages, because I don't want org to write > the preamble for me. But I think this is not the point. LATEX_PRE_HEADER you proposed is a document-local setting while `org-latex-classes' is shared by all Org documents. In that hack I used a buffer-local variable to achieve document-specific fragment. In the specific cases of \DocumentMetadata and .xmpdata, LATEX_PRE_HEADER needs to be passed through `format-spec' with result of `org-latex--format-spec' call to get notion of Org metadata. Whether it is necessary for \PassOptionsToPackage depends on particular cases. If such options do not vary across documents then certainly `org-latex-classes' becomes viable. I do not like "[NO-PACKAGES]" and similar keywords to suppress adding of some code snippets. That is why I believe it is better to seek for another approach to generate LaTeX preamble. I have not had a look into Timothy's code yet, so I can say nothing concerning its flexibility in respect to substituting metadata into code before \documentclass.