Re: rmsbolt.el [Was: Colorful line numbers]

["João Távora" <joaotavora@gmail.com>]

Eli Zaretskii <eliz@gnu.org> writes:

>> Aaanyway, I think I'm happy with the current implementation that _doesn't_ 
>> use line numbers at all. I think this discussion has been productive (to some
>> degree).  If I ever need this again (or someone else, like Dmitry), I'll be sure
>> to ping here again. 
>
> OK.  Let me just say, for the future, that basing this on text
> properties is IMO not the best idea.  I think a better idea is to have
> some buffer-local (or window-local) variable whose value is an
> appropriate data structure that specifies faces for ranges of line
> numbers.  Of course that value will need to be updated at suitable
> times, which in itself is not a trivial task.

OK.  Since we're in speculation territory, I don't see a big difference
between that and using text properties, which are also a buffer-local
structure.  Looking up the line we're iterating in that hypothetical
Lisp structure would seem to amount to about the same work as looking
for a particulr text property in a known place of that same line.  But
without the complexity of a new data structure.

But I'd have to see the proposed API and benchmark the two solutions to
make sure.

João