I'm writing a paper using org-mode, using the LaTeX export function to generate the .tex file I need to submit to the journal.
How can I run an external shell command every time I to the C-c C-e l l for LaTeX export? I need to apply a patch to the generated .tex file.
You might do this by using Org's publishing functions, and setting up one for your project. Take a look in particular at the setting publishing-function, which allows you to specify an arbitrary elisp function by which an org file within a given project is exported.
The publishing function might do a standard export to latex then run a shell command on the resulting file like this:
(defun publish-latex-and-patch (plist filename pub-dir) "Export a latex file then patch it by reversing lines" (let ((outfile (org-publish-org-to 'latex filename ".tex" plist pub-dir))) (shell-command (format "tac %s > %s-patched.tex" outfile (file-name-sans-extension outfile))))) And you would then export your file by doing C-c C-e P f ("publish this file"). Obviously replace tac with your patching command, and exercise hygiene (e.g. escaping) if passing untrusted input to the shell.
There are also many org-export hooks, but they are more designed to modify specify elements within the parse tree during the export process.
