[luatex] Is there a hook that could be used by a pdf postprocessor?

[Knut Petersen]

Am 11.12.2017 um 15:56 schrieb David Shourabi Porcel:
> Hi!
>
> If it's possible to carry out the postprocessing you need from within
> LuaTeX instead of with ghostscript, the callback finish_pdffile might
> be an option.

finish_pdffile is called very early.

Unfortunately even the stop_run callback is executed before the complete pdf has been written and closed:

    \directlua {
       function my_stop_run()
         os.execute("stat lyInLatex.pdf")
       end
       luatexbase.add_to_callback('stop_run', my_stop_run, 'TEST')
    }

A "stat lyInLatex.pdf" after luatex finished shows that 40 bytes are not written at the time of callback execution.

Let's have a look at the source code:

    void finish_pdf_file(PDF pdf, int luatexversion, str_number luatexrevision)
    {
    [...]
        if (total_pages == 0) {
           [...]
         } else {
             if (pdf->draftmode == 0) {
                [...]
             } else {
                 if (callback_id > 0) {
                     run_callback(callback_id, "->");
                 }
             }
             libpdffinish(pdf);
             if (pdf->draftmode == 0)
                 close_file(pdf->file);
    *%**
    **            % I think that pdf_closed callback called at this place would be a good idea!**
    **            %*
             else
                 normal_warning("pdf backend","draftmode enabled, not changing output pdf");
         }

Knut
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