Re: [joe] undo limit

[Egmont K. <eg...@gm...>]

Hi Charles,

This is a very good point.  I was hit by the 100 limit quite often, I
myself set it to 1000.  I'd love to see a bigger default.

cheers,
egmont

On Mon, Dec 19, 2011 at 02:04, Charles J. Tabony <Tab...@au...>wrote:

> Hello fellow JOEers! (JOEys?)
>
> I've been using unlimited undo for years now with no problems.
> Occasionally I do something on a system that doesn't have my ~/.joerc,
> which is where I specify "-undo_keep 0".  I'll start editing something,
> then decide I want to back out a bunch of changes I've made only to
> find, to my horror, that I've hit the end of the undo buffer!
>
> For this reason, I would like to request that the undo limit be made
> much larger, if not unlimited, by default.  Since this change would
> affect everyone that doesn't have their own .j{oe,macs,pico,star}rc, I
> would like to solicit comments from other users.  Here are some questions:
>
> If you have enabled unlimited undo, have you ever had problems with it?
>
> Do you have any good reasons why the undo limit should not be raised?  I
> know the concern would be memory usage, but I suspect that most users
> run JOE on systems with plenty of memory, and those running JOE on
> systems with very constrained memory are likely editing small files.
>
> I just now read what Emacs and Vim do.  Vim is like JOE in that it
> specifies how many undo records will be kept, except that its default
> "undolevels" is 1000 on Unix, VMS, Win32, and OS/2, and 100 otherwise,
> whereas JOE's default limit is 100 on all systems.  Emacs expresses its
> limit in terms of bytes, and its default limit is 80,000.  Perhaps a
> byte limit would be better for JOE, since that means it could keep many
> more small edits without blowing out memory when someone makes a few
> huge edits.
>
> If you limit the number of bytes, then one question is, what do you do
> when a single undo record exceeds that limit.  Vim does not limit the
> size of each undo record.  Emacs, by default, limits the size of the
> last undo record to 12,000,000, and warns if the last record was thrown
> away because it exceeded the limit.  I think that JOE should always keep
> at least one record, no matter what the size.
>
> The next question would be what the limit should be.  I suppose the
> default should be something that will prevent JOE from crashing on small
> systems, but then I'm right back where I started, since I would want to
> set it to something in the gigabytes.  What do you think?
>
> Thanks,
> Charles J. Tabony
>
>
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