Re: How to add pseudo vector types

[Dmitry Gutov]

On 26.07.2021 22:45, Yuan Fu wrote:
> > Last time something like these discontinuous ranges was discussed as a
> > general feature in Emacs, we couldn't come up with an agreed-upon
> > design and implementation.  So adding something like that to Emacs is
> > not an easy job.
> We can provide both. Those who needs the more powerful ranges could use that, 
> and those who don’t can use narrowing.

If one wanted to continue where the previous discussions stopped, we 
tentatively decided that the variable prog-indentation-context could 
help. I.e. when some multiple-major-mode framework wanted to tell the 
current major mode that there are more "ranges" of the same mode in the 
buffer, it would bind prog-indentation-context to some particular value.

It's very much "to be discussed later", but the second element of 
prog-indentation-context can be a list of those ranges, or, more likely, 
a functions that produces that list.