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[FR] RefTex support for zref-xr

From: Gustavo Barros
Subject: [FR] RefTex support for zref-xr
Date: Tue, 30 Nov 2021 15:28:09 -0300
User-agent: mu4e 1.6.10; emacs 27.2

Hi All,

RefTeX has support for external documents, as defined by the `xr' package, which is really useful when one is using it.

However, there's another package with similar functionality, but catering for `zref' references, which is actually a module of `zref' itself, named `zref-xr'. Currently, RefTeX does not support it, and I'd like to suggest the inclusion of its support.

The working of `zref-xr' is pretty much identical to that of `xr', and the only syntax difference is that the command to import the references starts with a "z" (thus `\zexternaldocument'), and it has a starred variant. As far as I can tell, it would suffice to adjust the regexp for it in `reftex-parse-from-file' for these minor differences. Light testing suggest it works.

A MWE to illustrate the functionality of the package:


#+begin_src latex




\section{Section A1}




#+begin_src latex




\section{Section B1}


Of course, this will result in "No external documents available" if one tries to make a reference to `sec:section-b1' from `documentA.tex' with RefTeX. The example is just for the sake of easing things in case someone wants to try it out, and to motivate the request.

Side note: If I'm not mistaken, the current regexp would also fail to match if the `nocite' argument from `xr-hyper' is in use.

Best regards,

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