[texhax] Before and After Display Hooks

[Vafa Khalighi]

Thanks but this produces

*start* 1+2=3
end

rather than

start
1+2=3
end

On Mon, May 2, 2011 at 10:41 AM, Donald Arseneau <asnd at triumf.ca> wrote:

> Vafa Khalighi <vafa018 at gmail.com> writes:
>
> > There is \everydisplay primitive but how can you have something before
> > display and something after display. I mean can you define
> > \beforeeveryDisplay and \aftereverydisplay hooks? See this example:
> >
> > start
> > $$1+2=3$$
> > end
> >
> > So I could have
> > \beforeeverydisplay{start}
> > \aftereverydisplay{end}
> > $$1+2=3$$
> >
> > \beforeeverydisplay and \aftereverydisplay works for every single display
> > just like how \everydisplay works.
>
>
> \everydisplay{\aftergroup\the\aftergroup\aftereverydisplay
>              \the\beforeeverydisplay}
>
>
> Donald Arseneau                          asnd at triumf.ca
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