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 Sender: Mailing list for the LaTeX3 project <[log in to unmask]> Date: Thu, 23 Jul 2020 14:37:09 +0200 Reply-To: Mailing list for the LaTeX3 project <[log in to unmask]> MIME-Version: 1.0 Message-ID: <[log in to unmask]> In-Reply-To: <[log in to unmask]> Content-Type: text/plain; charset="UTF-8" From: Michal Hoftich <[log in to unmask]> Parts/Attachments: text/plain (76 lines) Hello Joseph, Thank you for your detailed answer. > # \shipout > > There are very few packages that actually modify the \shipout primitive: > almost everyone uses either everyshi or atbegshi, and we have arranged > for those to be emulated. As such, the only packages that need to be > modified here are those that *directly*, which is limited as far as we > know to pgf, crop and a few other packages. There are then a number of > hooks one can use > > - shipout/before > - shipout/foreground > - shipout/background > - shipout/firstpage > - shipout/lastpage > > as described in "texdoc ltshipout". We patch \shipout on one occasion: \let\:shipout=\shipout \def\shipout{\vfil\break\let\shipout=\:shipout \shipout} If I understand correctly, it is executed only in the first use of \shipout and it doesn't seem to do anything useful, although I am sure there was a use case at some point for that. Is this code OK? It should work even in Plain. > # \document > > Many more packages patch \document. Those adding code using > \AtBeginDocument will have no issues: this kernel-level hook will > continue to be available, although it is now a wrapper around > \AddToHook. Many others will be using etoolbox's hooks: they are already > aware of the new kernel hooks and again will need no work from package > authors. > Yes, we use \AtBeginDocument a lot. It is good that this will continue to work. > For people directly altering \document, the need to take action will > depend on the exact nature of the changes. For example, I have had to > adjust beamer, but siunitx, which also patches \document, continues to > work with no action. (I will update to use 'best practice', but that is > not a *requirement*.) Basically, anything that starts messing with the > detail of \document needs action, whereas simply adding a macro to the > end of \document works out OK. > > Where you do need to take action, there are now a number of hooks > > - env/document/before: Occurs as soon as \begin{document} is seen, > before the group is opened > - env/document/begin: Occurs just after environment group is opened: > for \document this is not really different from the above due to > the special nature of \document > - begindocument: Replaces \AtBeginDocument, occurring after the .aux > file is read > - begindocument/end: Occurs right at the end of \document, followed > only by \ignorespaces: where many people add 'last minute' stuff to > \document > This seems really useful, thanks. BTW, I was able to find the main clashes between TeX4ht and new LaTeX code, so it works for the test file. I hope it will work also for real world documents. Best regards, Michal