overlay start/end marker access funs?

overlay start/end marker access funs?

[Miles Bader]

I wanted to augment `describe-text-at' to print the start/end
insertion-types of overlays, but there doesn't seem to be any way to
actually get that info in elisp.

So, I thought it might be nice to add `overlay-start-marker'and
`overlay-end-marker' access functions -- then one could use
`marker-insertion-type' to do what I want.

Does anyone see a problem with allowing elisp access to these markers?
(or is there one already, and I'm missing it?)

[If there is a problem, I guess something like `overlay-start-insertion-type'
and `overlay-end-insertion-type' would be OK, then.]

Thanks,

-Miles
-- 
97% of everything is grunge

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Re: overlay start/end marker access funs?

[Stefan Monnier]

> I wanted to augment `describe-text-at' to print the start/end
> insertion-types of overlays, but there doesn't seem to be any way to
> actually get that info in elisp.
> 
> So, I thought it might be nice to add `overlay-start-marker'and
> `overlay-end-marker' access functions -- then one could use
> `marker-insertion-type' to do what I want.
> 
> Does anyone see a problem with allowing elisp access to these markers?
> (or is there one already, and I'm missing it?)
> 
> [If there is a problem, I guess something like `overlay-start-insertion-type'
> and `overlay-end-insertion-type' would be OK, then.]

The lack of this functionality is already noted in subr.el in
the definition of `copy-overlay'.  So I agree it would be good to have.


	Stefan


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Re: overlay start/end marker access funs?

[Richard Stallman]

    Does anyone see a problem with allowing elisp access to these markers?
    (or is there one already, and I'm missing it?)

That would make it possible to call move-marker on them,
which would mess up the overlay data structure.

So it would be better to add a function that only provides access
to the insertion types.

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