Re: face-remapping patch

[tomas@tuxteam.de]

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On Wed, May 28, 2008 at 10:31:46PM +0200, David Kastrup wrote:
> 
> Sorry, C-c C-c is just too close to C-x C-x.  This posting was not
> finished.
> 
> David Kastrup <dak@gnu.org> writes:

[...]

> > (make-local-variable VARIABLE &optional locus)
> >
> > Make VARIABLE have a separate value in the given locus (defaulting to
> > the current buffer).
> >
> > A locus can be a buffer, a frame, a terminal, a window.  When there is
> > more than one locus for which a variable may be local, the value is used
> > from the first locus in the list window - buffer - frame - terminal.
[...]
> Bing.  A simple API, easy to understand, easy to use.  And
> _transparent_.

Appealing. Humble suggestion: make the list of possible loci extensible,
with the above mentioned being the minimal, "built-in" set. I don't know
yet how an interface would look like, but several other classes of loci
suggest themselves: major modes, (human) languages, what not.

> Now XEmacs specifiers offer something more: you can specify local values
> for _classes_ of display, like B&W, or reduced color or so.  We have
> something like that for faces.

Hm. Would that not be covered by your proposal? You'd just need a little
bit more of indirection. Your locus-local variable (locus=terminal) wouldn't
be a face itself, but a display class -- which then determines the face.

Whether it's worth it -- I don't know.

> However, I don't think the price for the generality of specifiers is
> worth the complexity in the particular implementation and documentation
> state of XEmacs.  I did not understand them after trying for a
> considerable amount of time, and I am arrogant enough to consider
> something which I feel unable to understand as being off the complexity
> bell curve for reliable engineering.

:-)

Still I read your posts carefully.

Regards
- -- tomás
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