Re: [Texmacs-dev] Ideas for the switch environment/strange bug

[Joris van der Hoeven]

On 26 Mar 2003, Álvaro Tejero Cantero wrote:
> I have been thinking on how to make usable outside of interactive
> TeXmacs the switch environment.
>
> I like to call it "frame", because it conveys to me the idea of a video
> frame. But I disgress...
>
> I have been making some slides, and now want to export to ps or print. I
> cannot. One would propose to concatenate in different pages the slides
> and then print. But that approach would leave apart the educational use
> of switch (imagine a complicated mathematical expression which turns
> into a low-dimensional example when you hit M-A-right). So what is
> needed IMHO is two "unroll" commands that make the (possible) tree of
> switches into switches into a sequence and offer to insert intermediary
> page breaks. That way you could do a global unroll for the sequential
> media. This would be useful for the two use cases I have in mind:
>
> 1) slides.
> 2) educational innovation.

Yes, I agree with the usefulness of such an operation.

> Is this doable in scheme?

Yes, it should actually be quite simple.
However, as often, the solution is deemed to be temporary.

> I attach now my slides because I have a funny behaviour with TM ..1.5
> when creating a new document and trying to insert \copyleft. In general
> TeXmacs has been much more prone to crashes when this document was
> loaded.
>
> Fatal error: lost sync in pk file (character too big / status =  6 in
> 'load_pk'.
> See file: 'load-pk.gen.cc

Yes, I don't understand this either. I found no documentation about
the pk  format when I needed it, so I adapted a program from the TeX
distribution. That is also the origin of the bug...