Re: IDE

[Eli Zaretskii]

> From: David Kastrup <address@hidden>
> Date: Sat, 10 Oct 2015 20:46:13 +0200
> 
> Emacs sucks at multiple-language buffers out of the box.  They are
> inherent for any form of literate programming, they are rather prevalent
> for embedding languages in HTML, they are useful for things like Texinfo
> with embedded examples, I'd need them for LilyPond (which integrates
> Scheme code).  Many IDEs are single-language to start with, and if they
> aren't, they are either generic or single-language per file.
> 
> There is mmm-mode but it's not part of ELPA (and probably not
> copyright-assignable, at least that's my guess of why it might be out).
> And I strongly suspect that some stronger core features inside of Emacs
> would be desirable, like keeping indentation and font-locking engines
> and syntax constrained to regions identified with overlays or text
> properties.

I indeed think that we should have infrastructure to turn on a major
mode in a region of a buffer.

I'm not sure we should use text properties or overlays for that,
though.  The region could be part of the command that turns on the
mode with region limits stored in markers.