Re: [Texmacs-dev] Leaves of the tree

[Joris van der Hoeven]

Hi Alvaro,

On Wed, May 20, 2009 at 11:48:51AM +0200, Alvaro Tejero Cantero wrote:
> how feasible would be to have '(' open a new environment? I would
> really like to use TeXmacs' facilities for structured editing in order
> to navigate within a parenthetical expression (both in math and in
> text, and for [], {}, --- ---, etc). In particular I would be
> interested in binding 'enter' to get me out (now right cursor).
> 
> The same question applies for paragraphs.
> 
> Would it be expensive performance-wise?

This issue is on my list. Long ago, this had a penalty both regarding 
performance and
memory usage. Currently, we do not have to worry about memory usage anymore and
with TeXmacs getting more and more modern, it will actually enhance performance.
So this is definitely going to come at a certain point.

> Can it be done at the level of scheme by binding the opening
> delimiters with the creation of a user-defined environment? well
> hyphenation work properly with this approach?

No, the issue is far more complex, because of a delicate behaviour regarding
cursor positioning and deletions. Another subtle point concerns upgrading
old documents towards this more structured behaviour. As to the brackets,
the French interval notation, e.g. ]a,b], may be a source of problems.

Best wishes, Joris