[XeTeX] moreverb in beamer

[Michael Iatrou]

When the date was Tuesday 09 December 2008, Ulrike Fischer wrote:

> Am Tue, 9 Dec 2008 12:52:16 +0200 schrieb Michael Iatrou:
> >> I am using ``moreverb'' package with beamer in order to get visible
> >> tabs on verbatim environment. Specifically I am usign the following
> >> code:
> >>
> >> But it seems like verbatimtab is ignored and simple verbatim
> >> environment is used for the output instead (no indentation).
> >
> > So it seems it's a beamer bug, specifically Ronan Keryell proposed the
> > following correction in beamerbaseverbatim.sty
> >
> > Using LaTeX this fixes the problem, but for XeTeX the result is that
> > the ^^I doesn't get replaced, so the output looks like:
> >
> > indentation
> > ^^Idoesn't
> > ^^I^^Iwork
> >
> > Any ideas?
>
> The problem is that xetex writes auxiliary files differently than
> pdflatex. If the catcode of the tab is 12, xetex writes a tab as ^^I. So
> beamer writes
>
> \begin{verbatimtab}[4]
> indentation
> ^^Idoesn't
> ^^I^^Iwork
> \end{verbatimtab}
>
> But inside verbatimtab ^ has catcode 12 too, so ^^I is not a tab but
> three normal input chars.
>
> It is possible to get a tab by resetting the catcode of ^ to seven:
>
>   \beamer at makeinnocent\^^I% and whatever other special cases
>   \catcode`\^=7
>
>
> But be aware that you no longer can use ^ in other context (e.g. a^b)
> inside such a verbatim environment.

Interesting, thank you!

Hopefully, there could be a ``portable'' way between latex-xetex to use 
moreverb environment in beamer without such side-effects.

-- 
 Michael Iatrou (zwam)